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Warrant Agreement - CGX Communications Inc., Cleartel Communications Inc., CAIS Inc. and ING (U.S.) Capital Corp.

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                               WARRANT AGREEMENT

                         Dated as of September 4, 1998

                                 by and among

                           CGX COMMUNICATIONS, INC.,

                        CLEARTEL COMMUNICATIONS, INC.,

                                  CAIS, INC.

                                      and

                        ING (U.S.) CAPITAL CORPORATION


          WARRANT AGREEMENT (this "Agreement") is made and entered into as of
September 4, 1998 by and among CGX COMMUNICATIONS, INC., a Delaware corporation
("CGX"), CLEARTEL COMMUNICATIONS, INC., a District of Columbia corporation
("Cleartel"), CAIS, INC., a Virginia corporation ("CAIS"), the Holders of the
Warrants from time to time, and ING (U.S.) CAPITAL CORPORATION, as agent for
Holders of the Warrants (the "Agent").

          WHEREAS, in consideration for, among other things, the transactions
contemplated by the Credit Documents (as defined below) the Warrant Issuers each
agree to issue Common Stock purchase warrants, as hereinafter described (the
"Warrants"), to purchase up to an aggregate of 3.0% of each of their respective
shares of Common Stock (as defined below) outstanding (on a fully-diluted basis)
as of the Issue Date, and subsequently on each 6-month anniversary of 
<PAGE>
 
the Issue Date for so long as any obligations of the Borrowers (or Issuers),
Guarantors or other Obligors under the Credit Documents remain outstanding or
unsatisfied. Each Warrant entitles the holder thereof to purchase one share of
Common Stock.

          NOW, THEREFORE, in consideration of the premises and the mutual
agreements herein set forth, and for the purpose of defining the respective
rights and obligations of the Warrant Issuers, the Agent and the Lenders and
Noteholders (as defined below), the parties hereto agree as follows:

          Section 1.  Certain Definitions.  Capitalized defined terms used in
                      -------------------                                    
this Agreement and not otherwise defined herein shall have the meanings given to
those terms in the Credit Agreement.  As used in this Agreement, the following
terms shall have the following respective meanings:

          "Agent" means ING (U.S.) Capital Corporation, New York, New York as
agent for the Lenders, or any successor thereto appointed by the Lenders
pursuant to Section 7.8 of the Credit Agreement.

          "Commission" means the Securities and Exchange Commission.

          "Common Equity Securities" means Common Stock and securities
convertible into, or exercisable or exchangeable for, Common Stock or rights or
options to acquire Common Stock or such other securities, excluding the
Warrants.

          "Common Stock" means the common stock, par value $.01 per share, of
each of the Warrant Issuers, and any other capital stock of the Warrant Issuers
into which such common stock may be converted or reclassified or that may be
issued in respect of, in exchange for, or in substitution for, such common stock
by reason of any stock splits, stock dividends, distributions, mergers,
consolidations or other like events.

          "Conversion Date" means February 26, 1999.

          "Credit Agreement" means the Credit Agreement dated as of September 4,
1998, by and among the Borrowers, 

                                       2
<PAGE>
 
the Owners referred to therein, the Lenders listed on the signature pages
thereto and the Agent.

          "Exchange Act" means the Securities Exchange Act of 1934, as amended,
or any successor statute, and the rules and regulations promulgated thereunder.

          "Exercise Price" means the purchase price per share of Common Stock to
be paid upon the exercise of each Warrant in accordance with the terms hereof,
which price shall initially be $0.01 per share, subject to adjustment from time
to time pursuant to Section 12 hereof.

          "Expiration Date" means September 4, 2008.

          "Holder" means a Person who is the owner as shown on the Warrant
register maintained by the Warrant Issuers.

          "Issue Date" means the date of the initial issuance of the Warrants,
which shall be the Closing Date under the Credit Agreement.

          "Principal Office of Agent" means the Agent's office located at 135
East 57th Street, New York, New York, or such other office of the Agent as the
Agent shall designate from time to time in writing as its Principal Office for
the purposes of this Agreement.

          "Registrable Securities" means any of (i) the Warrant Shares and (ii)
any other securities issued or issuable with respect to any Warrant Shares by
way of stock dividend or stock split or in connection with a combination of
shares, recapitalization, merger, consolidation or other reorganization or
otherwise, unless, in each case, such Warrant Shares and securities, if any,
have been offered and sold to the Holders pursuant to an effective Registration
Statement under the Securities Act declared effective prior to the date of
exercisability of the Warrants or the date such Warrant Shares and securities,
if any, may be sold to the public pursuant to Rule 144 without any restriction
on the amount of securities which may be sold by such Holders or the
satisfaction of any condition. As to any particular Registrable Securities held
by a Holder, such securities shall cease to be Registrable Securities when (i) a
Registration Statement with respect to the exercise or offering of such
securities by the Holder thereof shall have been declared effective under the
Securities Act and such 

                                       3
<PAGE>
 
securities shall have been exercised and/or disposed of by such Holder pursuant
to such Registration Statement, (ii) such securities may at the time of
determination be sold to the public pursuant to Rule 144 without any restriction
on the amount of securities which may be sold by such Holder (or any similar
provision then in force, but not Rule 144A) without the lapse of any further
time or the satisfaction of any condition, (iii) such securities shall have been
otherwise transferred by such Holder and new certificates for such securities
not bearing a legend restricting further transfer shall have been delivered by
the Warrant Issuers or their transfer agent and subsequent disposition of such
securities shall not require registration or qualification under the Securities
Act or any similar state law then in force or (iv) such securities shall have
ceased to be outstanding.

          "Rule 144" shall mean Rule 144 promulgated under the Securities Act,
as such Rule may be amended from time to time, or any similar rule (other than
Rule 144A) or regulation hereafter adopted by the Commission providing for
offers and sales of securities made in compliance therewith resulting in offers
and sales by subsequent holders that are not affiliates of an issuer of such
securities being free of the registration and prospectus delivery requirements
of the Securities Act.

          "Rule 144A" shall mean Rule 144A promulgated under the Securities Act,
as such Rule may be amended from time to time, or any similar rule (other than
Rule 144) or regulation hereafter adopted by the Commission.

          "Securities Act" means the Securities Act of 1933, as amended, or any
successor statute and the rules and regulations promulgated thereunder.

          "Warrant Issuer" means Cleartel Communications, Inc., CGX
Communications, Inc. and CAIS, Inc., and on and subsequent to the Restructuring
Date, Warrant Issuer shall mean CGX Communications, Inc.

          "Warrant Registration Rights Agreement" means the registration rights
agreement, dated as of the date hereof by and among CGX, Cleartel, CAIS and the
Agent relating to the Warrants and the Warrant Shares.

                                       4
<PAGE>
 
          "Warrant Shares" means the shares of Common Stock issued or issuable
upon the exercise of the Warrants.

          Section 2.  Reserved.
                      -------- 

          Section 3.  Issuance of Warrants; Warrant Certificates.
                      ------------------------------------------ 

          (a) The Warrants will be issued in the form of definitive
certificates, substantially in the form of Exhibit A (the "Warrant
Certificates").  Each Warrant shall provide that it shall represent the
aggregate amount of outstanding Warrants from time to time endorsed thereon and
that the aggregate amount of outstanding Warrants represented thereby may from
time to time be reduced or increased, as appropriate.

          (b) The Warrants shall be initially issued on the Issue Date in the
amount of 3.0% of the then outstanding (on a fully-diluted basis) shares of the
Common Stock of each of the Warrant Issuers.  On each six month anniversary
subsequent to the Issue Date, the Warrants each automatically shall be increased
in amount by 3.0% of the then outstanding (on a fully-diluted basis) shares of
the Common Stock of each of the Warrant Issuers until such time as there are no
outstanding Obligations of the Borrowers (or Issuers), Guarantors or other
Obligors under the Credit Documents.

          Section 4.  Execution of Warrant Certificates.  Warrant Certificates
                      ---------------------------------                       
shall be signed on behalf of each of the Warrant Issuers by such Warrant
Issuer's President or a Vice President and by its Secretary or an Assistant
Secretary under its corporate seal. Each such signature upon the Warrant
Certificates may be in the form of a facsimile signature of the present or any
future President, Vice President, Secretary or Assistant Secretary and may be
imprinted or otherwise reproduced on the Warrant Certificates and for that
purpose the Warrant Issuers may adopt and use the facsimile signature of any
person who shall have been President, Vice President, Secretary or Assistant
Secretary, notwithstanding the fact that at the time the Warrant Certificates
shall be countersigned and delivered or disposed of, such person shall have
ceased to hold such office. The seal of the Warrant Issuers may be in the form
of a facsimile thereof and may be impressed, 

                                       5
<PAGE>
 
affixed, imprinted or otherwise reproduced on the Warrant Certificates.

          In case any officer of the Warrant Issuers who shall have signed any
of the Warrant Certificates shall cease to be such officer before the Warrant
Certificates so signed shall have been disposed of by the Warrant Issuers, such
Warrant Certificates nevertheless may be countersigned and delivered or disposed
of as though such person had not ceased to be such officer of the Warrant
Issuers; and any Warrant Certificate may be signed on behalf of the Warrant
Issuers by any person who, at the actual date of the execution of such Warrant
Certificate, shall be a proper officer of the Warrant Issuers to sign such
Warrant Certificate, although at the date of the execution of this Warrant
Agreement any such person was not such officer.

          Section 5.  Registration. The Warrant Issuers, shall number and
                      ------------                                        
register the Warrant Certificates in a register as they are issued by the
Warrant Issuers.

          The Warrant Issuers and the Agent may deem and treat the person in
whose name any Warrant is registered as the absolute owner(s) thereof, for all
purposes, and neither the Warrant Issuers nor the Agent shall be affected by any
notice to the contrary.

          Section 6.  Registration of Transfers and Exchanges.
                      --------------------------------------- 

          (a)  Transfer and Exchange of Warrants and Registrable Securities.
               ------------------------------------------------------------  
When Warrants or Registrable Securities are presented to the Warrant Issuers
with a request:

          (i)  to register their transfer; or

          (ii) to exchange such Warrants for an equal number of Warrants of
       other authorized denominations,

the Warrant Issuers shall register the transfer or make the exchange as
requested if the following requirements are met:

          (x)  the Warrants presented or surrendered for registration of
     transfer or exchange shall be duly endorsed or accompanied by a written
     instruction of transfer in form satisfactory to the Warrant Issuers, 

                                       6
<PAGE>
 
duly executed by the Holder thereof or by his attorney-in-fact, duly authorized
in writing; and

          (y)  in the case of Registrable Securities, such request shall be
accompanied by the following additional information and documents (all of which
may be submitted by facsimile), as applicable:


               (A)  if such Registrable Security is being delivered to the
          Warrant Issuers by a Holder for registration in the name of such
          Holder, without transfer, a certification from such Holder to that
          effect (in substantially the form of Exhibit B hereto);

               (B)  if such Registrable Security is being transferred (1) to a
          "qualified institutional buyer" (as defined in Rule 144A) in
          accordance with Rule 144A or (2) pursuant to an exemption from
          registration in accordance with Rule 144 (and based on an opinion of
          counsel if the Warrant Issuers so request) or (3) pursuant to an
          effective registration statement under the Securities Act, a
          certification to that effect (in substantially the form of Exhibit B
          hereto);

               (C)  if such Registrable Security is being transferred pursuant
          to an exemption from registration in accordance with Rule 904 under
          the Securities Act (and based on an opinion of counsel if the Warrant
          Issuers so request), a certification to that effect (in substantially
          the form of Exhibit B hereto); or

               (D)  if such Registrable Security is being transferred in
          reliance on another exemption from the registration requirements of
          the Securities Act (and based on an opinion of counsel if the Warrant
          Issuers so request), a certification to that effect (in substantially
          the form of Exhibit B hereto).

          (b)  Legends.
               ------- 

          (i)  Except for any Registrable Security sold or transferred as
     discussed in clause (ii) below, each Warrant Certificate (and all Warrants
     issued in 

                                       7
<PAGE>
 
exchange therefor or substitution thereof) and each certificate representing the
Warrant Shares shall bear a legend in substantially the following form:

          "THE SECURITY (OR ITS PREDECESSOR) EVIDENCED HEREBY WAS ORIGINALLY
          ISSUED IN A TRANSACTION EXEMPT FROM REGISTRATION UNDER SECTION 5 OF
          THE UNITED STATES SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES
          ACT"), AND THE SECURITY EVIDENCED HEREBY AND THE SECURITIES DELIVERED
          UPON EXERCISE THEREOF MAY NOT BE EXERCISED, OFFERED, SOLD OR OTHERWISE
          TRANSFERRED IN THE ABSENCE OF SUCH REGISTRATION OR AN APPLICABLE
          EXEMPTION THEREFROM. EACH PURCHASER OF THE SECURITY EVIDENCED HEREBY
          AND THE SECURITIES DELIVERED UPON THE EXERCISE THEREOF IS HEREBY
          NOTIFIED THAT THE SELLER MAY BE RELYING ON THE EXEMPTION FROM THE
          PROVISIONS OF SECTION 5 OF THE SECURITIES ACT PROVIDED BY RULE 144A.

          THE HOLDER OF THE SECURITY EVIDENCED HEREBY AGREES FOR THE BENEFIT OF
          THE ISSUER THAT (A) SUCH SECURITY AND THE SECURITIES DELIVERED UPON
          EXERCISE HEREOF MAY BE EXERCISED, RESOLD, PLEDGED OR OTHERWISE
          TRANSFERRED, ONLY (1)(a) TO A PERSON WHO THE SELLER REASONABLY
          BELIEVES IS A QUALIFIED INSTITUTIONAL BUYER (AS DEFINED IN RULE 144A
          UNDER THE SECURITIES ACT) IN A TRANSACTION MEETING THE REQUIREMENTS OF
          RULE 144A , (b) IN A TRANSACTION MEETING THE REQUIREMENTS OF RULE 144
          UNDER THE SECURITIES ACT, (c) OUTSIDE THE UNITED STATES TO A PERSON
          THAT IS NOT A U.S. PERSON (AS DEFINED IN RULE 902 UNDER THE SECURITIES
          ACT) IN A TRANSACTION MEETING THE REQUIREMENTS OF RULE 904 UNDER THE
          SECURITIES ACT, OR (d) IN ACCORDANCE WITH ANOTHER EXEMPTION FROM THE
          REGISTRATION REQUIREMENTS OF THE SECURITIES ACT (IN THE CASE OF (b),
          (c) or (d), UPON AN OPINION OF COUNSEL AND WRITTEN CERTIFICATION IF
          THE ISSUER OR WARRANT AGENT, REGISTRAR OR TRANSFER AGENT FOR THE
          SECURITIES SO REQUESTS), (2) TO THE ISSUER OR (3) PURSUANT TO AN
          EFFECTIVE REGISTRATION STATEMENT AND, IN EACH CASE, IN ACCORDANCE WITH
          ANY APPLICABLE SECURITIES LAWS OF ANY STATE OF THE UNITED STATES OR
          ANY OTHER APPLICABLE JURISDICTION AND (B) THE HOLDER WILL, AND EACH
          SUBSEQUENT 

                                       8
<PAGE>
 
          HOLDER IS REQUIRED TO, NOTIFY ANY PURCHASER FROM IT OF THE
          SECURITY EVIDENCED HEREBY AND THE SECURITIES DELIVERED UPON EXERCISE
          HEREOF OF THE RESALE RESTRICTIONS SET FORTH IN (A) ABOVE."


          (ii) Upon any sale or transfer of a Registrable Security pursuant to
     an effective registration statement under the Securities Act, pursuant to
     Rule 144(k) or pursuant to an opinion of counsel reasonably satisfactory to
     the Warrant Issuers that no legend is required, the Holder thereof shall be
     permitted to exchange such Registrable Security for a Warrant that does not
     bear the legend set forth in clause (i) above and rescind any restriction
     on the transfer of such Registrable Security.

          (c)  Obligations with respect to Transfers and Exchanges of Warrants.
               --------------------------------------------------------------- 

          (i)  To permit registrations of transfers and exchanges, the Warrant
     Issuers shall execute in accordance with the provisions of Section 5 and
     this Section 6, Warrants as required pursuant to the provisions of this
     Section 6.  Notwithstanding anything to the contrary contained herein, the
     Warrant Issuers shall refuse to register any transfer of the Warrants not
     made in accordance with Regulation S, pursuant to registration under the
     Securities Act or pursuant to an available exemption from the registration
     requirements of the Securities Act; provided, however, that if a foreign
                                         --------  -------                   
     law prevents the Warrant Issuers from refusing to register securities
     transfers, the Warrant Issuers shall implement other reasonable measures
     designed to prevent transfers of the Warrants not made in accordance with
     Regulation S, pursuant to registration under the Securities Act or pursuant
     to an available exemption from the registration requirements of the
     Securities Act.

          (ii) All Warrants issued upon any registration of transfer or
     exchange of Warrants shall be the valid obligations of the Warrant Issuers,
     entitled to the same benefits under this Warrant Agreement, as the Warrants
     surrendered upon such registration of transfer or exchange.

                                       9
<PAGE>
 
          (iii) Prior to due presentment for registration of transfer of any
     Warrant, the Warrant Issuers may deem and treat the person in whose name
     any Warrant is registered as the absolute owner of such Warrant and the
     Warrant Issuers shall not be affected by notice to the contrary.

          (iv)  No service charge shall be made to a Holder for any registration
     of transfer or exchange.

          (j)   Exchange of Warrants After Restructuring Date.  Upon the
                ---------------------------------------------           
effectiveness of the Restructuring, CGX, as the sole parent holding company for
Cleartel and CAIS (a) automatically shall become the sole Warrant Issuer of
Warrants in an aggregate amount equivalent to the percentage of its Common Stock
(on a fully diluted basis) then outstanding as the applicable percentages of
Warrants to which the Warrant Holders would have been entitled to prior to the
Restructuring Date and (b) shall assume all of Cleartel's and CAIS' obligations
under this Agreement and the Warrant Registration Rights Agreement.  As of the
Restructuring Date, the outstanding Warrants shall be exchanged for Warrants
representing Warrants issued by CGX in accordance with this Section 6.

          Section 7.  Terms of Warrants; Exercise of Warrants.  Subject to the
                      ---------------------------------------                 
terms of this Agreement, each Warrant Holder shall have the right, which may be
exercised at any time and from time to time, in whole or in part, commencing at
9:00 a.m., New York City time, commencing on the 30th day after the Closing Date
and ending at 5:00 p.m., New York City time, on the Expiration Date, to receive
from the Warrant Issuers the number of fully paid and nonassessable Warrant
Shares which the Holder may at the time be entitled to receive on exercise of
such Warrants and payment of the Exercise Price then in effect for such Warrant
Shares; provided, however, that no Warrant Holder shall be entitled to exercise
        --------  -------                                                      
such Holder's Warrants at any time, unless, at the time of exercise, (i) a
registration statement under the Securities Act relating to the Warrant Shares
has been filed with, and declared effective by, the Commission, and no stop
order suspending the effectiveness of such registration statement has been
issued by the Commission or (ii) the issuance of the Warrant Shares is permitted
pursuant to an exemption from the registration requirements of the Securities
Act.  Subject to the provisions of the following paragraph of this Section 7,

                                       10
<PAGE>
 
each Warrant not exercised prior to 5:00 p.m., New York City time, on the
Expiration Date shall become void and all rights thereunder and all rights in
respect thereof under this Agreement shall cease as of such time. No adjustments
as to dividends will be made upon exercise of the Warrants.

          The Warrant Issuers shall give notice not less than 90, and not more
than 120, days prior to the Expiration Date to the Holders of all then
outstanding Warrants to the effect that the Warrants will terminate and become
void as of 5:00 p.m., New York City time, on the Expiration Date. If the Warrant
Issuers fail to give such notice, the Warrants will not expire until 90 days
after the Warrant Issuers give such notice, provided, however, in no event will
Holders be entitled to any damages or other remedy for the Warrant Issuers'
failure to give such notice other than any such extension.

          A Warrant may be exercised upon surrender to the Warrant Issuers of
the certificate or certificates evidencing the Warrant to be exercised with the
form of election to purchase on the reverse thereof properly completed and
signed, which signature shall be guaranteed by a bank or trust company having an
office or correspondent in the United States or a broker or dealer which is a
member of a registered securities exchange or the National Association of
Securities Dealers, Inc., and upon payment to the Warrant Issuers of the
Exercise Price as adjusted as herein provided, for each of the Warrant Shares in
respect of which such Warrants are then exercised. Payment of the aggregate
Exercise Price shall be made in cash or by certified or official bank check,
payable to the order of the Warrant Issuers. In the alternative, each Holder may
exercise its right to receive Warrant Shares (i) on a net basis, such that
without the exchange of any funds, the Holder receives that number of Warrant
Shares otherwise issuable upon exercise of its Warrants less that number of
Warrant Shares having a fair market value equal to the aggregate Exercise Price
that would otherwise have been paid by the Holder for the Warrant Shares being
issued, (ii) by tendering Loans or converted Notes having an aggregate principal
amount, plus accrued but unpaid interest, if any, thereon, to the date of
exercise equal to the aggregate Exercise Price that would otherwise have been
paid by the Holder for the Warrant Shares being issued, or (iii) by a
combination of the procedures in clauses (i) and (ii). For purposes of the

                                       11
<PAGE>
 
foregoing sentence, "fair market value" of the Warrant Shares shall be as
determined by the Boards of Directors of the Warrant Issuers in good faith and
evidenced by a resolution thereof. The Warrant Issuers shall notify the Holders
in writing of any such determination of fair market value.

          Subject to the provisions of Section 8 hereof, upon surrender of
Warrants and payment of the Exercise Price as provided above, the Warrant
Issuers shall promptly transfer to the Holder of such Warrant a certificate or
certificates for the appropriate number of Warrant Shares or other securities or
property (including any money) to which the Holder is entitled, registered or
otherwise placed in, or payable to the order of, such name or names as may be
directed in writing by the Holder, and shall deliver such certificate or
certificates representing the Warrant Shares and any other securities or
property (including any money) to the Person or Persons entitled to receive the
same, together with an amount in cash in lieu of any fraction of a share as
provided in Section 14. Any such certificate or certificates representing the
Warrant Shares shall be deemed to have been issued and any Person so designated
to be named therein shall be deemed to have become a Holder of record of such
Warrant Shares as of the later of the date of the surrender of such Warrants and
payment of the Exercise Price.

          The Warrants shall be exercisable commencing on the Issue Date, at the
election of the Holders thereof, either in full or from time to time in part
and, in the event that a certificate evidencing Warrants is exercised in respect
of fewer than all of the Warrant Shares issuable on such exercise at any time
prior to the date of expiration of the Warrants, a new certificate evidencing
the remaining Warrant or Warrants will be issued and delivered pursuant to the
provisions of this Section and of Section 4 hereof.

          All Warrant Certificates surrendered upon exercise of Warrants shall
be cancelled.  Such cancelled Warrant Certificates shall then be disposed of in
accordance with customary procedures.

          Section 8.  Payment of Taxes.  The Warrant Issuers will pay all
                      ----------------                                   
documentary stamp taxes attributable to the initial issuance of Warrant Shares
upon the exercise of Warrants and to any separation of the Warrants from the

                                       12
<PAGE>
 
Notes; provided, however, that the Warrant Issuers shall not be required to pay
       --------  -------                                                       
any tax or taxes which may be payable in respect of any transfer involved in the
issue of any Warrant Certificates or any certificates for Warrant Shares in a
name other than that of the Holder of a Warrant Certificate surrendered upon the
exercise of a Warrant, and the Warrant Issuers shall not be required to issue or
deliver such Warrant Certificates unless or until the person or persons
requesting the issuance thereof shall have paid to the Warrant Issuers the
amount of such tax or shall have established to the satisfaction of the Warrant
Issuers that such tax has been paid.

          Section 9.  Mutilated or Missing Warrant Certificates.  In case any of
                      -----------------------------------------                 
the Warrant Certificates shall be mutilated, lost, stolen or destroyed, the
Warrant Issuers may in their discretion issue in exchange and substitution for
and upon cancellation of the mutilated Warrant Certificate, or in lieu of and
substitution for the Warrant Certificate lost, stolen or destroyed, a new
Warrant Certificate of like tenor and representing an equivalent number of
Warrants, but only upon receipt of evidence reasonably satisfactory to the
Warrant Issuers of such loss, theft or destruction of such Warrant Certificate
and, if requested, indemnity reasonably satisfactory to them. Applicants for
such substitute Warrant Certificates shall also comply with such other
reasonable regulations and pay such other reasonable charges as the Warrant
Issuers may prescribe.

          Section 10. Reservation of Warrant Shares.  The Warrant Issuers will
                      -----------------------------                           
at all times reserve and keep available, free from any preemptive rights, out of
the aggregate of its authorized but unissued Common Stock or its authorized and
issued Common Stock held in its treasury, for the purpose of enabling it to
satisfy any obligation to issue Warrant Shares upon exercise of Warrants, the
maximum number of shares of Common Stock which may then be deliverable upon the
exercise of all outstanding Warrants.

          The transfer agent for the Common Stock (the "Transfer Agent") and
every subsequent transfer agent for any shares of the Warrant Issuers' capital
stock issuable upon the exercise of any of the rights of purchase aforesaid will
be irrevocably authorized and directed at all times to reserve such number of
authorized shares as shall be required for such purpose. The Warrant Issuers
will keep a 

                                       13
<PAGE>
 
copy of this Agreement on file with the Transfer Agent and with every subsequent
transfer agent for any shares of the Warrant Issuers' capital stock issuable
upon the exercise of the rights of purchase represented by the Warrants. The
Warrant Issuers will supply such Transfer Agent with duly executed certificates
for such purposes and will provide or otherwise make available any cash which
may be payable as provided in Section 14. The Warrant Issuers will furnish such
Transfer Agent a copy of all notices of adjustments and certificates related
thereto, transmitted to each Holder of the Warrants pursuant to Section 15
hereof.

          Before taking any action which would cause an adjustment pursuant to
Section 12 hereof that would reduce the Exercise Price below the then par value
(if any) of the Warrant Shares, the Warrant Issuers will take any corporate
action which may, in the opinion of its counsel, be necessary in order that the
Warrant Issuers may validly and legally issue fully paid and nonassessable
Warrant Shares at the Exercise Price as so adjusted.

          The Warrant Issuers covenant that all Warrant Shares which may be
issued upon exercise of Warrants in accordance with the terms of this Agreement
(including the payment of the Exercise Price) will, upon issue, be duly and
validly issued, fully paid, nonassessable, and free of preemptive rights and
Liens.

          Section 11. Obtaining Stock Exchange Listings.  The Warrant Issuers
                      ---------------------------------                      
will from time to time take all action which may be necessary so that the
Warrant Shares, immediately upon their issuance upon the exercise of Warrants,
will be listed on the principal securities exchanges and markets (including,
without limitation, the Nasdaq National or SmallCap Markets) within the United
States of America, if any, on which other shares of Common Stock are then
listed. Upon the listing of such Warrant Shares, the Warrant Issuers shall
notify the Holders in writing. The Warrant Issuers will obtain and keep all
required permits and records in connection with such listing.

          Section 12. Adjustment of Exercise Price and Number of Warrant Shares
                      ---------------------------------------------------------
Issuable.  The number and kind of shares purchasable upon the exercise of
--------                                                                 
Warrants and the Exercise Price shall be subject to adjustment from time to 

                                       14
<PAGE>
 
time (as set forth in the notices required by Section 15 hereof) as follows:

          (a)  Stock Splits, Combinations, etc.  In case any of the Warrant
               -------------------------------                             
Issuers shall hereafter (A) pay a dividend or make a distribution on its Common
Stock in shares of its capital stock (whether shares of Common Stock or of
capital stock of any other class), (B) subdivide its outstanding shares of
Common Stock, (C) combine its outstanding shares of Common Stock into a smaller
number of shares, or (D) issue by reclassification of its shares of Common Stock
any shares of capital stock of such Warrant Issuer, the Exercise Price in effect
and the number of Warrant Shares issuable upon exercise of each Warrant
immediately prior to such action shall be adjusted so that the Holder of any
Warrant thereafter exercised shall be entitled to receive the number of shares
of capital stock of such Warrant Issuer which such Holder would have owned
immediately following such action had such Warrant been exercised immediately
prior thereto. Any adjustment made pursuant to this paragraph shall become
effective immediately after the record date in the case of a dividend and shall
become effective immediately after the effective date in the case of a
subdivision, combination or reclassification. If, as a result of an adjustment
made pursuant to this paragraph, the Holder of any Warrant thereafter exercised
shall become entitled to receive shares of two or more classes of capital stock
of such Warrant Issuer, the Board of Directors of such Warrant Issuer (whose
determination shall be conclusive and evidenced by a Board resolution) shall
determine the allocation of the adjusted Exercise Price between or among shares
of such classes of capital stock.

          (b)  Reclassification, Combinations, Mergers, etc.  In case of any
               --------------------------------------------                 
reclassification or change of outstanding shares of Common Stock issuable upon
exercise of the Warrants (other than as set forth in paragraph (a) above and
other than a change in par value, or from par value to no par value, or from no
par value to par value or as a result of a subdivision or combination), or in
case of any consolidation or merger of any of the Warrant Issuers with or into
another corporation (other than a merger in which such Warrant Issuer is the
continuing corporation and which does not result in any reclassification or
change of the then outstanding shares of Common Stock or other capital stock
issuable upon exercise of the Warrants) or in case of 

                                       15
<PAGE>
 
any sale or conveyance to another corporation of all or substantially all of the
assets of such Warrant Issuer, then, as a condition of such reclassification,
change, consolidation, merger, sale or conveyance, such Warrant Issuer or such a
successor or purchasing corporation, as the case may be, shall forthwith make
lawful and adequate provision whereby the Holder of each Warrant then
outstanding shall have the right thereafter to receive on exercise of such
Warrant the kind and amount of shares of stock and other securities and property
receivable upon such reclassification, change, consolidation, merger, sale or
conveyance by a Holder of the number of shares of Common Stock issuable upon
exercise of such Warrant immediately prior to such reclassification, change,
consolidation, merger, sale or conveyance and enter into a supplemental warrant
agreement so providing. Such provisions shall include provision for adjustments
which shall be as nearly equivalent as may be practicable to the adjustments
provided for in this Section 12. If the issuer of securities deliverable upon
exercise of Warrants under the supplemental warrant agreement is an affiliate of
the formed, surviving or transferee corporation, that issuer shall join in the
supplemental warrant agreement. The above provisions of this paragraph (b) shall
similarly apply to successive reclassifications and changes of shares of Common
Stock and to successive consolidations, mergers, sales or conveyances.

          (c)  Issuance of Options or Convertible Securities.  In the event any
               ---------------------------------------------                   
of the Warrant Issuers shall, at any time or from time to time after the date
hereof, issue, sell, distribute or otherwise grant in any manner (including by
assumption) to all holders of the Common Stock any rights to subscribe for or to
purchase, or any warrants or options for the purchase of, Common Stock or any
stock or securities convertible into or exchangeable for Common Stock (any such
rights, warrants or options being herein called "Options" and any such
convertible or exchangeable stock or securities being herein called "Convertible
Securities") or any Convertible Securities (other than upon exercise of any
Option), whether or not such Options or the rights to convert or exchange such
Convertible Securities are immediately exercisable, and if the price per share
at which Common Stock is issuable upon the exercise of such Options or upon the
conversion or exchange of such Convertible Securities (determined by dividing
(i) the aggregate amount, if any, received or receivable by such Warrant Issuer
as 

                                       16
<PAGE>
 
consideration for the issuance, sale, distribution or granting of such Options
or any such Convertible Security, plus the minimum aggregate amount of
additional consideration, if any, payable to such Warrant Issuer upon the
exercise of all such Options or upon conversion or exchange of all such
Convertible Securities, plus, in the case of Options to acquire Convertible
Securities, the minimum aggregate amount of additional consideration, if any,
payable upon the conversion or exchange of all such Convertible Securities, by
(ii) the total maximum number of shares of Common Stock issuable upon the
exercise of all such Options or upon the conversion or exchange of all such
Convertible Securities or upon the conversion or exchange of all Convertible
Securities issuable upon the exercise of all such Options) shall be less than
the current market price per share of Common Stock on the record date for the
issuance, sale, distribution or granting of such Options or Convertible
Securities (any such event being herein called a "Distribution"), then,
effective upon such Distribution, (I) the Exercise Price shall be reduced to the
price (calculated to the nearest 1/1,000 of one cent) determined by multiplying
the Exercise Price in effect immediately prior to such Distribution by a
fraction, the numerator of which shall be the sum of (i) the number of shares of
Common Stock outstanding (exclusive of any treasury shares) immediately prior to
such Distribution multiplied by the current market price per share of Common
Stock on the date of such Distribution plus (ii) the consideration, if any,
received by such Warrant Issuer in respect of such Distribution, and the
denominator of which shall be the product of (A) the total number of shares of
Common Stock outstanding (exclusive of any treasury shares) immediately after
such Distribution multiplied by (B) the current market price per share of Common
Stock on the record date for such Distribution and (II) the number of shares of
Common Stock purchasable upon the exercise of each Warrant shall be increased to
a number determined by multiplying the number of shares of Common Stock so
purchasable immediately prior to the record date for such Distribution by a
fraction, the numerator of which shall be the Exercise Price in effect
immediately prior to the adjustment required by clause (I) of this sentence and
the denominator of which shall be the Exercise Price in effect immediately after
such adjustment. For purposes of the foregoing, the total maximum number of
shares of Common Stock issuable upon exercise of all such Options or upon
conversion or exchange of all such 

                                       17
<PAGE>
 
Convertible Securities or upon the conversion or exchange of the total maximum
amount of the Convertible Securities issuable upon the exercise of all such
Options shall be deemed to have been issued as of the date of such Distribution
and thereafter shall be deemed to be outstanding and such Warrant Issuer shall
be deemed to have received as consideration therefor such price per share,
determined as provided above. Except as provided in paragraphs (i) and (j)
below, no additional adjustment of the Exercise Price shall be made upon the
actual exercise of such Options or upon conversion or exchange of the
Convertible Securities or upon the conversion or exchange of the Convertible
Securities issuable upon the exercise of such Options.


          (d)  Dividends and Distributions.  In the event any of the Warrant
               ---------------------------                                  
Issuers shall, at any time or from time to time after the date hereof,
distribute to all the holders of Common Stock any dividend or other distribution
of cash, evidences of its indebtedness, other securities or other properties or
assets (in each case other than (i) dividends payable in Common Stock, Options
or Convertible Securities and (ii) any cash dividend that, when added to all
other cash dividends paid in the one year prior to the declaration date of such
dividend (excluding any such other dividend included in a previous adjustment of
the Exercise Price pursuant to this paragraph (d) and excluding any cash
dividends or other cash distributions from current or retained earnings), does
not exceed 5% of the current market price per share of Common Stock on such
declaration date), or any options, warrants or other rights to subscribe for or
purchase any of the foregoing, then (A) the Exercise Price shall be decreased to
a price determined by multiplying the Exercise Price then in effect by a
fraction, the numerator of which shall be the current market price per share of
Common Stock on the record date for such distribution less the sum of (X) the
cash portion, if any, of such distribution per share of Common Stock outstanding
(exclusive of any treasury shares) on the record date for such distribution plus
(Y) the then fair market value (as determined in good faith by the Board of
Directors of such Warrant Issuer) per share of Common Stock outstanding
(exclusive of any treasury shares) on the record date for such distribution of
that portion, if any, of such distribution consisting of evidences of
indebtedness, other securities, properties, assets, options, warrants or

                                       18
<PAGE>
 
subscription or purchase rights, and the denominator of which shall be such
current market price per share of Common Stock and (B) the number of shares of
Common Stock purchasable upon the exercise of each Warrant shall be increased to
a number determined by multiplying the number of shares of Common Stock so
purchasable immediately prior to the record date for such distribution by a
fraction, the numerator of which shall be the Exercise Price in effect
immediately prior to the adjustment required by clause (A) of this sentence and
the denominator of which shall be the Exercise Price in effect immediately after
such adjustment. The adjustments required by this paragraph (d) shall be made
whenever any such distribution occurs retroactive to the record date for the
determination of stockholders entitled to receive such distribution.

          (e)  Current Market Price.  For the purpose of any computation of
               --------------------                                        
current market price under this Section 12 and Section 14, the current market
price per share of Common Stock at any date shall be (x) for purposes of Section
14, the closing price on the business day immediately prior to the exercise of
the applicable Warrant pursuant to Section 7 and (y) in all other cases, the
average of the daily closing prices for the shorter of (i) the 20 consecutive
trading days ending on the last full trading day on the exchange or market
specified in the second succeeding sentence prior to the Time of Determination
(as defined below) and (ii) the period commencing on the date next succeeding
the first public announcement of the issuance, sale, distribution or granting in
question through such last full trading day prior to the Time of Determination.
The term "Time of Determination" as used herein shall be the time and date of
the earlier to occur of (A) the date as of which the current market price is to
be computed and (B) the last full trading day on such exchange or market before
the commencement of "ex-dividend" trading in the Common Stock relating to the
event giving rise to the adjustment required by paragraph (a), (b), (c) or (d)
above. The closing price for any day shall be the last reported sale price
regular way or, in case no such reported sale takes place on such day, the
average of the closing bid and asked prices regular way for such day, in each
case (1) on the principal national securities exchange on which the shares of
Common Stock are listed or to which such shares are admitted to trading or (2)
if the Common Stock is not listed or admitted to trading on a national
securities exchange, in the over-the-counter 

                                       19
<PAGE>
 
market as reported by Nasdaq National or SmallCap Markets or any comparable
system or (3) if the Common Stock is not listed on Nasdaq National or SmallCap
Markets or a comparable system, as furnished by two members of the NASD selected
from time to time in good faith by the Boards of Directors of the Warrant
Issuers for that purpose. In the absence of all of the foregoing, or if for any
other reason the current market price per share cannot be determined pursuant to
the foregoing provisions of this paragraph (e), the current market price per
share shall be the fair market value thereof as determined in good faith by the
Boards of Directors of the Warrant Issuers and evidenced by a Board resolution.

          (f)  Certain Distributions.  If any of the Warrant Issuers shall pay a
               ---------------------                                            
dividend or make any other distribution payable in Options or Convertible
Securities, then, for purposes of paragraph (c) above, such Options or
Convertible Securities shall be deemed to have been issued or sold without
consideration.

          (g)  Consideration Received.  If any shares of Common Stock, Options
               ----------------------                                         
or Convertible Securities shall be issued, sold or distributed for a
consideration other than cash, the amount of the consideration other than cash
received by the Warrant Issuers in respect thereof shall be deemed to be the
then fair market value of such consideration (as determined in good faith by the
Boards of Directors of the Warrant Issuers and evidenced by a Board resolution).
If any Options shall be issued in connection with the issuance and sale of other
securities of the Warrant Issuers, together comprising one integral transaction
in which no specific consideration is allocated to such Options by the parties
thereto, such Options shall be deemed to have been issued without consideration;
provided, however, that if such Options have an exercise price equal to or
--------  -------                                                         
greater than the current market price of the Common Stock on the date of
issuance of such Options, then such Options shall be deemed to have been issued
for consideration equal to such exercise price.

          (h)  Deferral of Certain Adjustments.  No adjustment to the Exercise
               -------------------------------                                
Price (including the related adjustment to the number of shares of Common Stock
purchasable upon the exercise of each Warrant) shall be required hereunder
unless such adjustment, together with other adjustments carried forward as
provided below, would 

                                       20
<PAGE>
 
result in an increase or decrease of at least one percent of the Exercise Price;
provided that any adjustments which by reason of this paragraph (h) are not
--------
required to be made shall be carried forward and taken into account in any
subsequent adjustment. No adjustment need be made for a change in the par value
of the Common Stock. All calculations under this Section shall be made to the
nearest 1/1,000 of one cent or to the nearest 1/1000 of a share, as the case may
be.

          (i)  Changes in Options and Convertible Securities.  If the exercise
               ---------------------------------------------                  
price provided for in any Options referred to in paragraph (c) above, the
additional consideration, if any, payable upon the conversion or exchange of any
Convertible Securities referred to in paragraph (c) or (d) above, or the rate at
which any Convertible Securities referred to in paragraph (c) or (d) above are
convertible into or exchangeable for Common Stock shall change at any time
(other than under or by reason of provisions designed to protect against
dilution upon an event which results in a related adjustment pursuant to this
Section 12), the Exercise Price then in effect and the number of shares of
Common Stock purchasable upon the exercise of each Warrant shall forthwith be
readjusted (effective only with respect to any exercise of any Warrant after
such readjustment) to the Exercise Price and number of shares of Common Stock so
purchasable that would then be in effect had the adjustment made upon the
issuance, sale, distribution or granting of such Options or Convertible
Securities been made based upon such changed purchase price, additional
consideration or conversion rate, as the case may be, but only with respect to
such Options and Convertible Securities as then remain outstanding.

          (j)  Expiration of Options and Convertible Securities.  If, at any
               ------------------------------------------------             
time after any adjustment to the number of shares of Common Stock purchasable
upon the exercise of each Warrant shall have been made pursuant to paragraph
(c), (d) or (i) above or this paragraph (j), any Options or Convertible
Securities shall have expired unexercised, the number of such shares so
purchasable shall, upon such expiration, be readjusted and shall thereafter be
such as they would have been had they been originally adjusted (or had the
original adjustment not been required, as the case may be) as if (i) the only
shares of Common Stock deemed to have been issued in connection with such

                                       21
<PAGE>
 
Options or Convertible Securities were the shares of Common Stock, if any,
actually issued or sold upon the exercise of such Options or Convertible
Securities and (ii) such shares of Common Stock, if any, were issued or sold for
the consideration actually received by the Warrant Issuers upon such exercise
plus the aggregate consideration, if any, actually received by the Warrant
Issuers for the issuance, sale, distribution or granting of all such Options or
Convertible Securities, whether or not exercised; provided that no such
                                                  --------             
readjustment shall have the effect of decreasing the number of such shares so
purchasable by an amount (calculated by adjusting such decrease to account for
all other adjustments made pursuant to this Section 12 following the date of the
original adjustment referred to above) in excess of the amount of the adjustment
initially made in respect of the issuance, sale, distribution or granting of
such Options or Convertible Securities.

          (k)  Other Adjustments.  In the event that at any time, as a result of
               -----------------                                                
an adjustment made pursuant to this Section 12, the Holders shall become
entitled to receive any securities of the Warrant Issuers other than shares of
Common Stock, thereafter the number of such other securities so receivable upon
exercise of the Warrants and the Exercise Price applicable to such exercise
shall be subject to adjustment from time to time in a manner and on terms as
nearly equivalent as practicable to the provisions with respect to the shares of
Common Stock contained in this Section 12.

          Section 13.  Statement on Warrants.  Irrespective of any adjustment in
                       ---------------------                                    
the number or kind of shares issuable upon the exercise of the Warrants or the
Exercise Price, Warrants theretofore or thereafter issued may continue to
express the same number and kind of shares as are stated in the Warrants
initially issuable pursuant to this Agreement.

          Section 14.  Fractional Interest.  The Warrant Issuers shall not be
                       -------------------                                   
required to issue fractional shares of Common Stock on the exercise of Warrants.
If more than one Warrant shall be presented for exercise in full at the same
time by the same Holder, the number of full shares of Common Stock which shall
be issuable upon such exercise shall be computed on the basis of the aggregate
number of shares of Common Stock acquirable on exercise of the Warrants so
presented. If any fraction of a share of Common Stock would, except for the
provisions of this Section, be issuable on 

                                       22
<PAGE>
 
the exercise of any Warrant (or specified portion thereof), the Warrant Issuers
shall direct the Transfer Agent to pay an amount in cash calculated by it equal
to (i) the then current market price per share multiplied by such fraction
computed to the nearest whole cent, less (ii) an amount equal to the Exercise
Price multiplied by such fraction computed to the nearest whole cent. The
Holders, by their acceptance of the Warrant Certificates, expressly waive any
and all rights to receive any fraction of a share of Common Stock or a stock
certificate representing a fraction of a share of Common Stock.

          Section 15.  Notices to Warrant Holders and the Warrant Agent.  Upon
                       ------------------------------------------------       
any adjustment of the Exercise Price pursuant to Section 12, the Warrant Issuers
shall promptly thereafter cause to be given to each of the registered Holders by
first-class mail, postage prepaid, and to the Agent a certificate executed by
the Chief Financial Officer of the Warrant Issuers setting forth the Exercise
Price after such adjustment and setting forth in reasonable detail the method of
calculation and the facts upon which such calculations are based and setting
forth the number of Warrant Shares (or portion thereof) issuable after such
adjustment in the Exercise Price, upon exercise of a Warrant and payment of the
adjusted Exercise Price, which certificate shall be conclusive evidence, absent
manifest error, of the correctness of the matters set forth therein.  The Agent
shall be entitled to rely on the above-referenced certificate and shall be under
no duty or responsibility with respect to any such certificate, except to
exhibit the same from time to time to any Holder desiring an inspection thereof
during reasonable business hours.  The Agent shall not at any time be under any
duty or responsibility to any Holder to determine whether any facts exist that
may require any adjustment of the number of shares of Common Stock or other
stock or property issuable on exercise of the Warrants or the Exercise Price, or
with respect to the nature or extent of any such adjustment when made, or with
respect to the method employed in making such adjustment or the validity or
value (or the kind or amount) of any shares of Common Stock or other stock or
property which may be issuable on exercise of the Warrants. The Warrant Agent
shall not be responsible for any failure of the Warrant Issuers to make any cash
payment or to issue, transfer or deliver any shares of Common Stock or stock
certificates or 

                                       23
<PAGE>
 
other common stock or property upon the exercise of any Warrant.

          In case:


          (a)  the Warrant Issuers shall authorize the issuance to all holders 
     of shares of Common Stock of rights, options or warrants to subscribe for
     or purchase shares of Common Stock or of any other subscription rights or
     warrants; or

          (b)  the Warrant Issuers shall authorize the distribution to all
     holders of shares of Common Stock of evidences of its indebtedness or
     assets (other than cash dividends or cash distributions payable out of
     consolidated earnings or earned surplus or dividends payable in shares of
     Common Stock or distributions referred to in Section 12 hereof); or

          (c)  of any consolidation or merger to which any of the Warrant 
     Issuers is a party for which approval of any shareholders of such Warrant
     Issuer is required and following which the shareholders of such Warrant
     Issuer before such consolidation or merger no longer hold at least 50% of
     the outstanding capital stock of such Warrant Issuer following the merger
     or consolidation, or of the conveyance or transfer of all or substantially
     all of the properties and assets of such Warrant Issuer, or of any
     reclassification or change of Common Stock issuable upon exercise of the
     Warrants (other than a change in par value, or from par value to no par
     value, or from no par value to par value, or as a result of a subdivision
     or combination), or a tender offer or exchange offer for shares of Common
     Stock, or other transaction that would result in a change in control; or

          (d)  of the voluntary or involuntary dissolution, liquidation or
     winding up of any of the Warrant Issuers; or

          (e)  the Warrant Issuers propose to take any other action that would
     require an adjustment of the Exercise Price or the number of Warrant Shares
     pursuant to Section 12;

                                       24
<PAGE>
 
then the Warrant Issuers shall cause to be filed with the Warrant Agent and
shall cause to be given to each of the registered Holders of the Warrants at
such Holder's address appearing on the Warrant register, at least 20 days (or 10
days in any case specified in clauses (a) or (b) above) prior to the applicable
record date hereinafter specified, or promptly in the case of events for which
there is no record date, by first-class mail, postage prepaid, a written notice
stating (i) the date as of which the holders of record of shares of Common Stock
to be entitled to receive any such rights, options, warrants or distribution are
to be determined, or (ii) the initial expiration date set forth in any tender
offer or exchange offer for shares of Common Stock, or (iii) the date on which
any such consolidation, merger, conveyance, transfer, dissolution, liquidation
or winding up or change of control is expected to become effective or
consummated, and the date as of which it is expected that holders of record of
shares of Common Stock shall be entitled to exchange such shares for securities
or other property, if any, deliverable upon such reclassification,
consolidation, merger, conveyance, transfer, dissolution, liquidation or winding
up or change of control. The failure to give the notice required by this Section
15 or any defect therein shall not affect the legality or validity of any
distribution, right, option, warrant, consolidation, merger, conveyance,
transfer, dissolution, liquidation or winding up, or change of control or the
vote upon any action. Nothing contained in this Agreement or in any of the
Warrant Certificates shall be construed as conferring upon the Holders thereof
the right to vote or to consent or to receive notice as shareholders in respect
of the meetings of shareholders or the election of Directors of the Warrant
Issuers or any other matter, or any rights whatsoever as shareholders of the
Warrant Issuers.

          Section 16.  Agent.
                       ----- 

          (a)  The statements contained herein and in the Warrant Certificates
     shall be taken as statements of the Warrant Issuers and the Agent assumes
     no responsibility for the correctness of any of the same.  The Agent
     assumes no responsibility with respect to the distribution of the Warrant
     Certificates.

          (b)  The Agent shall not be responsible for any failure of the Warrant
     Issuers to comply with any of 

                                       25
<PAGE>
 
     the covenants contained in this Agreement or in the Warrant Certificates.

          (c)  The Agent shall be under no obligation to institute any action,
     suit or legal proceeding.

          (d)  The Agent, and any stockholder, director, officer or employee of
     it, may buy, sell or deal in any of the Warrants or other securities of the
     Warrant Issuers or become pecuniarily interested in any transaction in
     which the Warrant Issuers may be interested, or contract with or lend money
     to the Warrant Issuers or otherwise act as fully and freely as though it
     were not an Agent under this Agreement. Nothing herein shall preclude the
     Agent from acting in any capacity for the Warrant Issuers or for any other
     legal entity.

          (e)  The Warrant Agent shall not be liable for anything which it may
     do or refrain from doing in connection with this Agreement.

          (f)  The Agent shall not at any time be under any duty or
     responsibility to any Holder of any Warrants to make or cause to be made
     any adjustment of the Exercise Price or number of the Warrant Shares or
     other securities or property deliverable as provided in this Agreement, or
     to determine whether any facts exist which may require any of such
     adjustments, or with respect to the nature or extent of any such
     adjustments, when made, or with respect to the method employed in making
     the same. The Agent shall not be accountable with respect to the validity
     or value or the kind or amount of any Warrant Shares or of any securities
     or property which may at any time be issued or delivered upon the exercise
     of any Warrant or with respect to whether any such Warrant Shares or other
     securities will when issued be validly issued and fully paid and
     nonassessable, and makes no representation with respect thereto.

          (g)  In no event shall the Agent be liable hereunder for special,
     indirect or consequential loss or damage of any kind whatsoever (including
     but not limited to lost profits), even if the Agent has been advised of the
     likelihood of such loss or damage and regardless of the form of action.  No
     provision in this 

                                       26
<PAGE>
 
     Agreement shall require the Agent to risk or expend its own funds or
     otherwise incur any financial liability hereunder.

          Section 17.  Registration.  The Warrant Issuers acknowledge that
                       ------------                                       
Holders of Warrants shall have the registration rights set forth in the Warrant
Registration Rights Agreement.

          Section 18.  Reports.  For the fiscal quarters ending September 30,
                       -------                                               
1998, March 31, 1999, June 30, 1999 and September 30, 1999 and for the fiscal
years ended December 31, 1998 and December 31, 1999, the Warrant Issuers will
(i) transmit by mail to all Warrant Holders, as their names and addresses appear
in the register, without cost to such Warrant Holders, and (ii) file with the
Agent unaudited quarterly and audited annual financial statements of the Warrant
Issuers prepared in accordance with GAAP.  Beginning with the financial
statements of the Warrant Issuers for the quarter ending March 31, 2000 and
thereafter, whether or not the Warrant Issuers are subject to Section 13(a) or
15(d) of the Exchange Act, or any successor provision thereto, the Warrant
Issuers shall prepare the annual and quarterly reports and other information,
and documents ("SEC Reports") as the Commission shall prescribe pursuant to such
Section 13(a) or 15(d) and which the Warrant Issuers are or would be (if they
were so subject) required to file with the Commission pursuant to such Section
13(a) or 15(d) or any successor provision thereto (on or prior to the respective
dates (the "Required Filing Dates") by which the Warrant Issuers are or would
(if they were so subject) be required so to file such SEC Reports) and shall,
within 15 days of the Required Filing Date (i) transmit by mail to all Warrant
Holders, as their names and addresses appear in the register, without cost to
such Warrant Holders, and (ii) file with the Agent, copies of such annual and
quarterly reports.

          Section 19.  Rule 144A.  Each of the Warrant Issuers hereby agrees
                       ---------                                             
with each Holder, for so long as any Registrable Securities remain outstanding
and such Warrant Issuer is not subject to Section 13(a) or 15(d) of the Exchange
Act, to make available, upon request of any Holder of Registrable Securities, to
any Holder or beneficial owner of Registrable Securities in connection with any
sale thereof and any prospective purchaser of such Registrable Securities
designated by such Holder or beneficial owner, 

                                       27
<PAGE>
 
the information required by Rule 144A(d)(4) under the Securities Act in order to
permit resales of such Registrable Securities pursuant to Rule 144A.

          Section 20.  Notices to Warrant Issuers.  Any notice or demand
                       --------------------------                       
authorized by this Agreement to be given or made by the Holder of any Warrants
to or on the Warrant Issuers shall be sufficiently given or made when and if
deposited in the mail, first-class or registered, postage prepaid, addressed
(until another address is filed in writing by the Warrant Issuers), as follows:


          CGX Communications, Inc.
          1232 22nd Street, N.W.
          Washington, D.C.  20037
          Telecopy:  (202) 463-8500
          Telephone: (202) 463-0770
          Attention: Ulysses G. Auger II, President

          with a copy to:


          Swidler Berlin Shereff Friedman, LLP
          3000 K Street N.W., Suite 300
          Washington, D.C.  20007
          Telecopy:  (202) 424-7647
          Telephone: (303) 424-7500
          Attention: Morris F. DeFeo, Jr.

          Any notice pursuant to this Agreement to be given by the Warrant
Issuers to the Holders shall be sufficiently given when and if deposited in the
mail, first-class or registered, postage prepaid, addressed (until another
address is filed in writing with the Warrant Issuers) to the addresses of the
Holders provided to the Warrant Issuers from time to time.

          Section 21.  Supplements and Amendments.  The Warrant Issuers and the
                       --------------------------                              
Agent may from time to time supplement or amend this Agreement without the
approval of any Holders of Warrants in order to cure any ambiguity or to correct
or supplement any provision contained herein which may be defective or
inconsistent with any other provision herein, or to make any other provisions in
regard to matters or questions arising hereunder which the Warrant Issuers and
the Agent may deem necessary or desirable and which shall not in any way
adversely affect the interests of the Holders of Warrants.  Any amendment or
supplement to this Agreement 

                                       28
<PAGE>
 
that has a material adverse effect on the interests of Holders shall require the
written consent of Holders representing a majority of the then outstanding
Warrants (excluding Warrants held by the Warrant Issuers or any of its
Affiliates); provided, however, that the consent of each Holder of a Warrant
             --------  ------- 
affected shall be required for any amendment pursuant to which the Exercise
Price would be increased or the number of Warrant Shares purchasable upon
exercise of Warrants would be decreased (other than pursuant to adjustments
provided for in Section 12 hereof). The Agent shall be entitled to receive and
shall be fully protected in relying upon an officer's certificate and opinion of
counsel as conclusive evidence that any such amendment or supplement is
authorized or permitted hereunder, that it does or does not, as the case may be,
require the written consent of Holders to be effective hereunder, that it is not
inconsistent herewith, and that it will be valid and binding upon the Warrant
Issuers in accordance with its terms.

          Section 22.  Successors.  All the covenants and provisions of this
                       ----------                                           
Agreement by or for the benefit of the Warrant Issuers shall bind and inure to
the benefit of their respective successors and assigns hereunder.

          Section 23.  Termination.  This Agreement (other than any party's
                       -----------                                         
obligations with respect to Warrants previously exercised and with respect to
indemnification) shall terminate at 5:00 p.m., New York City time on the
Expiration Date.

          Section 24.  Governing Law.  THIS AGREEMENT AND EACH WARRANT
                       -------------                                  
CERTIFICATE ISSUED HEREUNDER SHALL BE DEEMED TO BE A CONTRACT MADE UNDER THE
LAWS OF THE STATE OF NEW YORK AND FOR ALL PURPOSES SHALL BE CONSTRUED IN
ACCORDANCE WITH THE INTERNAL LAWS OF SAID STATE, WITHOUT GIVING EFFECT TO THE
CONFLICTS OF LAWS PRINCIPLES THEREOF.

          Section 25.  Benefits of This Agreement.
                       -------------------------- 

          (a)  The Holders are the third-party beneficiaries of this Agreement.
Nothing in this Agreement shall be construed to give to any Person other than
the Warrant Issuers, the Agent and the Holders of the Warrants any legal or
equitable right, remedy or claim under this Agreement; but this Agreement shall
be for the sole and exclusive 

                                       29
<PAGE>
 
benefit of the Warrant Issuers, the Agent and the Holders of the Warrants from
time to time.

          (b)  Prior to the exercise of the Warrants, no Holder of a Warrants,
as such, shall be entitled to any rights of a stockholder of a Warrant Issuer,
including, without limitation, the right to receive dividends or subscription
rights, the right to vote, to consent, to exercise any preemptive right, to
receive any notice of or to participate in meetings of stockholders for the
election of directors of such Warrant Issuer or any other matter or to receive
any notice of any proceedings of such Warrant Issuer, except as may be
specifically and expressly provided for herein. The Holders of the Warrants are
not entitled to share in the assets of the Warrant Issuers in the event of the
liquidation, dissolution or winding up of the Warrant Issuers' affairs.

          (c)  All rights of action in respect of this Agreement are vested in
the Holders of the Warrants, and any Holder of any Warrant, without the consent
of the Holder of any other Warrant, may, on such Holder's own behalf and for
such Holder's own benefit, enforce, and may institute and maintain any suit,
action or proceeding against the Warrant Issuers suitable to enforce, or
otherwise in respect of, such Holder's rights hereunder, including the right to
exercise, exchange or surrender for purchase such Holder's Warrants in the
manner provided in this Agreement.

          Section 26.  Counterparts.  This Agreement may be executed in any
                       ------------                                        
number of counterparts and each of such counterparts shall for all purposes be
deemed to be an original, and all such counterparts shall together constitute
but one and the same instrument.

                                       30
<PAGE>
 
          IN WITNESS WHEREOF, the parties hereto have caused this Agreement to
be duly executed, as of the day and year first above written.


                              CGX COMMUNICATIONS, INC.


                              By: /s/ Ulysses G. Auger, II 
                                 ___________________________
                              Name: Ulysses G. Auger, II 
                              Title: President


                              CLEARTEL COMMUNICATIONS, INC.


                              By: /s/ Ulysses G. Auger, II 
                                 ___________________________
                              Name: Ulysses G. Auger, II 
                              Title: President


                              CAIS, INC.


                              By: /s/ Ulysses G. Auger, II 
                                 ___________________________
                              Name: Ulysses G. Auger, II 
                              Title: President


                              ING (U.S.) Capital Corporation, as Agent


                              By: /s/ Bart Staal 
                                 ___________________________
                              Name: Bart Staal 
                              Title: Managing Director

                                       31
<PAGE>
 
                                                                       Exhibit B


                  CERTIFICATE TO BE DELIVERED UPON EXCHANGE OR
                     REGISTRATION OF TRANSFER OF WARRANTS

Re:  ________ Warrants to Purchase Common Stock (the "Warrants") of CGX
     Communications, Inc.

     This Certificate relates to ________ Warrants held in* _____ book-entry or
_____ definitive form by _______________ (the "Transferor").

The Transferor:

     [ ]    has requested the Warrant Issuers by written order to exchange or
register the transfer of a Warrant or Warrant(s).

     In connection with such request and in respect of each such Warrant, the
Transferor does hereby certify that the Transferor is familiar with the Warrant
Agreement relating to the above captioned Warrants and that the transfer of each
such Warrant does not require registration under the Securities Act of 1933, as
amended (the "Securities Act"), because:

     [ ]    Each such Warrant is being acquired for the Transferor's own account
without transfer.

     [ ]    Each such Warrant is being transferred (i) to a "qualified
institutional buyer" (as defined in Rule 144A under the Securities Act), in
reliance on Rule 144A or (ii) pursuant to an exemption from registration in
accordance with Rule 904 under the Securities Act (and, in the case of clause
(ii), based on an opinion of counsel and written certification if the Warrant
Issuers so request).

     [ ]    Each such Warrant is being transferred (i) in accordance with Rule
144 under the Securities Act (and based on an opinion of counsel if the Warrant
Issuers so request)


_______________________
* Check applicable box.
                                      B-1
<PAGE>
 
or (ii) pursuant to an effective registration statement under the Securities
Act.

     [ ]    Each such Warrant is being transferred in reliance on and in
compliance with another exemption from the registration requirements of the
Securities Act (and based on an opinion of counsel if the Warrant Issuers so
request).

                                  [INSERT NAME OF TRANSFEROR]        

                                  By: __________________________

                                  Name: ________________________

                                  Title: _______________________

Date:

                                      B-2