APPLIEDTHEORY CORP
8-K, 2000-01-20
COMPUTER INTEGRATED SYSTEMS DESIGN
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                                  UNITED STATES
                       SECURITITES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM 8-K

CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF
                                      1934

                                JANUARY 20, 2000
               (DATE OF REPORT - DATE OF EARLIEST EVENT REPORTED)


                            APPLIEDTHEORY CORPORATION
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

<TABLE>
<S>                                                         <C>
           DELAWARE                     000-25759                  16-1491253
(STATE OR OTHER JURISDICTION OF        (COMMISSION              (I.R.S. EMPLOYER
INCORPORATION OR ORGANIZATION)        FILE NUMBER)             IDENTIFICATION NO.)

            40 CUTTER MILL ROAD                                   11021
         SUITE 405, GREAT NECK, NY                             (ZIP CODE)
  (ADDRESS OF PRINCIPAL EXECUTIVE OFFICE)
</TABLE>

       REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE: (516) 466-8422

                                 NOT APPLICABLE

      (FORMER NAME, FORMER ADDRESS AND FORMER FISCAL YEAR, IF CHANGED SINCE
                               LAST REPORT DATE)

- --------------------------------------------------------------------------------




<PAGE>   2

ITEM 2. ACQUISITION OR DISPOSITION OF ASSETS

     As previously reported, on December 3, 1999, AppliedTheory Corporation
("AppliedTheory") entered into an agreement and plan of merger (the "Merger
Agreement") with CRL Network Services, Inc. ("CRL"), AppliedTheory Reef
Acquisition Corp., ("Merger Sub") a Delaware corporation wholly owned by
AppliedTheory, and certain stockholders of CRL. Pursuant to the Merger
Agreement, AppliedTheory agreed to aquire, through Merger Sub, all of the
capital stock of CRL for up to $10 million in cash and up to $32.5 million in
AppliedTheory common stock. For additional information regarding this event,
please see our Current Report on Form 8-K, filed December 20, 1999.

     On January 5, 2000, CRL and Merger Sub successfully completed the merger
(the "Merger") contemplated by the Merger Agreement and the surviving
corporation, Merger Sub, changed its name to AppliedTheory California
Corporation. All of the capital stock of AppliedTheory California Corporation
is owned by AppliedTheory.

     The total consideration to be delivered by AppliedTheory in connection
with the closing of the merger was adjusted pursuant to the Merger Agreement.
Accordingly, in connection with the closing of the merger AppliedTheory will
deliver up to approximately $9,955,954 in cash and up to approximately
2,022,291 shares of common stock, par value $.01 per share, of AppliedTheory.

     CRL provides high speed Internet access and data networking solutions to
businesses across the United States. CRL owns and operates a national, Tier 1
network backbone with services including connectivity, data networking, hosting,
high-bandwidth intranet and Internet connectivity services, email services and
domain name registration services.

     The purchase price for AppliedTheory's acquisition of CRL was determined
through arm's-length negotiations between AppliedTheory, CRL and the other
parties to the Merger Agreement. During these negotiations, the parties
considered, among other things, the market for CRL's services, CRL's internet
access and data networking solutions businesses, the present stage of
development of CRL's business and operations, CRL's financial condition, CRL's
future business prospects, and the estimated value of the synergies to be
realized between AppliedTheory and CRL following the closing of the Merger.

     In connection with the closing of the Merger, CRL's former President and
CEO, James G. Couch executed a non-disclosure and non-competition agreement in
favor of AppliedTheory and the Merger Sub. In connection with that closing,
AppliedTheory also entered into an escrow agreement (the "Escrow Agreement")
with James G. Couch, the Merger Sub and an escrow agent whereby 265,625 shares
of AppliedTheory Common Stock from the total merger consideration to which Mr.
Couch could be entitled in respect of his shares of CRL common stock will be
held in an escrow account (the "Escrow Account") for a period of one year
following the closing of the Merger. Following the closing of the Merger, the
shares of AppliedTheory common stock held in the Escrow Account will be
available as a fund against which AppliedTheory may seek indemnification from
Mr. Couch pursuant to the Merger Agreement. Also, upon the closing of the Merger
AppliedTheory entered into an escrow agreement (the "Tax Escrow Agreement") with
CRL, Merger Sub and an escrow agent whereby approximately $97,887 in cash and
approximately 19,882 shares of AppliedTheory common stock (collectively, the
"Tax Escrow Fund") will be held in escrow. The Tax Escrow Fund will be released
after AppliedTheory or Merger Sub shall have received any tax refund (the "Tax
Refund") to which either of them may be entitled as a result of CRL's prior
payment of taxes for the fiscal year ending December 31, 1997. Upon release of
the Tax Escrow Fund, the stockholders of CRL, on the one hand, and AppliedTheory
or Merger Sub, on the other hand, will receive a share of the Tax Escrow Fund
reflecting the size of the Tax Refund. In connection with the closing of the
Merger, AppliedTheory also entered into a put option agreement (the "Put Option
Agreement") with James G. Couch and other former CRL stockholders whereby those
parties will be able to require that AppliedTheory re-purchase up to Five
Million Dollars ($5,000,000) worth of AppliedTheory common stock on the first
anniversary of the closing of the Merger (the "First Put"), and up to another
Five Million Dollars ($5,000,000) worth of  AppliedTheory






<PAGE>   3
common stock on the second anniversary of the closing of the Merger (the "Second
Put") of the Merger. The First Put will terminate in the event that the average
closing price for AppliedTheory common stock as reported on the Nasdaq National
Market for any period of at least 30 consecutive days beginning 180 days after
the closing of the Merger shall exceed $20.00. The Second Put will terminate in
the event that the average closing price for AppliedTheory common stock as
reported on the Nasdaq National Market for any period of at least 30 consecutive
days beginning 180 days after the closing of the days beginning 180 days after
the closing of the Merger shall exceed $24.00. Additional terms governing the
termination of the First and Second Put are described in the Put option
agreement. Finally, in connection with the Merger, AppliedTheory entered into a
registration rights agreement (the "Registration Rights Agreement") with James
G. Couch and other former CRL stockholders whereby those parties will have (1)
the right to "piggyback" the registration of any number of the shares of
AppliedTheory common stock delivered pursuant to the Merger, for the period
beginning on the closing of the Merger and ending on the first anniversary of
the closing of the Merger and (2) the right to demand the filing of one
registration statement for up to 50% of the AppliedTheory common stock delivered
pursuant to the Merger, for the period beginning six months from the closing of
the Merger and ending on the first anniversary of the closing of the Merger.

     The Escrow Agreement, Put Option Agreement, Registration Rights Agreement
and Tax Escrow Agreement are included as Exhibits 2.2, 2.3, 2.4 and 2.5 to this
Current Report on Form 8-K. Please review these documents for additional
information regarding the terms of these agreements.

     AppliedTheory applied a portion of the funds raised through its initial
public offering (SEC File No. 333-72133)  for the cash portion of the purchase
price paid to the stockholders of CRL.

     AppliedTheory intends to operate CRL as a wholly-owned subsidiary which
will be known as AppliedTheory California Corporation. CRL will continue to
operate its business in the same manner as before the acquisition.

ITEM 7. FINANCIAL STATEMENTS, PROFORMA FINANCIAL
        INFORMATION AND EXHIBITS

(a.) Financial Statements of CRL.

     AppliedTheory will file the required financial statements under cover of
Form 8-K/A no later than 60 days after this Report is filed.

(b.) Pro Forma Financial Information.

     AppliedTheory will file the required pro forma financial statements under
cover of Form 8-K/A no later than 60 days after this Report is filed.

<PAGE>   4
(c.) Exhibits.

     Following is the Index of Exhibits furnished in accordance with Item 601 of
Regulation S-K, filed as part of this Current Report on Form 8-K or
incorporated by reference herewith:

2.1  Agreement and Plan of Merger, dated December 3, 1999, by and among
     AppliedTheory Corporation, AppliedTheory Reef Acquisition Corp., CRL
     Network Services, Inc., a Delaware Corporation, and James G. Couch.*

2.2  Escrow Agreement, dated January 5, 2000, by and among, AppliedTheory
     Corporation, AppliedTheory Reef Acquisition Corp., United States Trust
     Company of New York, and James G. Couch.

2.3  Put Option Agreement dated January 5, 2000, by and between, AppliedTheory
     Corporation, James G. Couch and other holders of capital stock of CRL
     Network Services, Inc.

2.4  Registration Rights Agreement dated January 5, 2000, by and between
     AppliedTheory Corporation, James G. Couch and any other holders of
     registerable stock of CRL Network Services, Inc. who may join the
     agreement.

2.5  Tax Escrow Agreement dated January 5, 2000, by and among AppliedTheory
     Corporation, AppliedTheory Reef Acquisition Corp., CRL Network Services,
     Inc. and United States Trust Company of New York.

99.1 Press release issued by AppliedTheory Corporation on December 6, 1999.*

99.2 Press release issued by AppliedTheory Corporation on January 6, 2000.

*    Incorporated by reference from the Current Report on Form 8-K, filed by
     AppliedTheory Corporation on December 20, 1999.



<PAGE>   5

                                   SIGNATURES

     Pursuant to the requirements of the Securities and Exchange Act of 1934,
the Registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.

                                         AppliedTheory Corporation

Date:  January 20, 2000               by:   /s/ Richard Mandelbaum
                                         -------------------------
                                         Richard Mandelbaum
                                         Chairman of the Board,
                                         Chief Executive Officer, and
                                         Director (Principal Executive Officer)




<PAGE>   6


                                  EXHIBIT INDEX
<TABLE>
<CAPTION>
Exhibit No.    Description
- ----------     -----------
<S>            <C>
2.1            Agreement and Plan of Merger, dated December 3, 1999, by and
               among AppliedTheory Corporation, AppliedTheory Reef Acquisition
               Corp., CRL Network Services, Inc., a Delaware Corporation, and
               James G. Couch.*

2.2            Escrow Agreement, dated January 5, 2000, by and among, Applied
               Theory Corporation, AppliedTheory Reef Acquisition Corp., United
               States Trust Company of New York, and James G. Couch.

2.3            Put Option Agreement dated January 5, 2000, by and between,
               AppliedTheory Corporation, James G. Couch and other holders of
               capital stock of CRL Network Services, Inc.

2.4            Registration Rights Agreement dated January 5, 2000, by and
               between AppliedTheory Corporation, James G. Couch and any other
               holders of registerable stock of CRL Network Services, Inc. who
               may join the agreement.

2.5            Tax Escrow Agreement dated January 5, 2000, by and among Applied
               Theory Corporation, AppliedTheory Reef Acquisition Corp., CRL
               Network Services, Inc. and United States Trust Company of New
               York.

99.1           Press release issued by AppliedTheory Corporation on December 6,
               1999.*

99.2           Press release issued by AppliedTheory Corporation on January 6,
               2000.

*              Incorporated by reference from the Current Report on Form 8-K,
               filed by AppliedTheory Corporation on December 20, 1999.
</TABLE>



389146.7

<PAGE>   1
                                                                     EXHIBIT 2.2

                                ESCROW AGREEMENT
              THIS ESCROW AGREEMENT (the "Escrow Agreement") dated as of
January 5, 2000, is made by and among AppliedTheory Corporation, a Delaware
corporation ("Parent"), AppliedTheory Reef Acquisition Corp., a Delaware
Corporation (the "Company"), United States Trust Company of New York (the
"Escrow Agent"), and James G. Couch (the "Company Stockholder") as contemplated
by that certain Agreement and Plan of Merger, dated as of December 3, 1999, by
and among Parent, AppliedTheory Reef Acquisition Corp., a Delaware Corporation
(the "Merger Sub"), the Company, and the Company Stockholder (the "Agreement and
Plan of Merger"). Capitalized terms not otherwise defined herein shall have the
meanings ascribed to them in the Agreement and Plan of Merger.
              WHEREAS, Parent, the Company, and the Company Stockholder have
entered into the Agreement and Plan of Merger to provide for the merger of the
Company and the Merger Sub and the corresponding transfer to the Parent of all
the ownership interests of the Company (the "Merger");
              WHEREAS, the Company Stockholder has agreed to indemnify Parent in
certain circumstances pursuant to Article 7 of the Agreement and Plan of Merger;

              WHEREAS, the closing of the transactions contemplated by the
Agreement and Plan of Merger is taking place as of the date hereof and the
execution of this Escrow Agreement by the parties is an express condition
thereto; and

              WHEREAS, Parent has relied upon the representations, warranties
and covenants of the Company and the Company Stockholder provided in the
Agreement and Plan of Merger and in the Schedules, Exhibits and other
instruments or agreements delivered to and in favor of Parent pursuant to the
Agreement and Plan of Merger.

              NOW, THEREFORE, to induce Parent to proceed with the Closing and
the Merger, and in further consideration of the mutual covenants and agreements
contained herein and in the Agreement and Plan of Merger, and intending to be
legally bound, the parties hereto do hereby agree as follows:

                                    ARTICLE I
                             CREATION OF ESCROW FUND

              SECTION 1.1. Contemporaneous with the execution of this Escrow
Agreement, Parent shall deposit at Closing a portion of the Parent Common Stock
equal in value to Four Million Two Hundred and Fifty Thousand Dollars
($4,250,000), with the Escrow Agent, such deposit to constitute an escrow fund
(the "Escrow Fund") to be governed by the terms set forth herein. Upon
compliance with the terms hereof, Parent shall be entitled to receive payment
from the Escrow Fund in the form of shares of Parent Common Stock for all Losses
for which Parent is entitled to indemnification under the Agreement and Plan of
Merger.




<PAGE>   2

              SECTION 1.2. The Escrow Agent shall hold, safeguard and dispose of
the Escrow Fund in accordance with the terms hereof and shall treat such Escrow
Fund as an escrow fund in accordance with the terms hereof.

                                   ARTICLE II
                                  ESCROW PERIOD

              The funds forming the Escrow Fund shall remain in existence for a
period of twelve months commencing on the Closing of the Agreement and Plan of
Merger (the "Escrow Period") and no claim may be asserted thereafter; provided,
however, that any Parent Common Stock which shall continue to be maintained in
the Escrow Fund beyond the Escrow Period pursuant to Article V shall be held
subject to the terms hereof.

                                   ARTICLE III
                           CLAIMS AGAINST ESCROW FUND

              SECTION 3.1. Claims against the Escrow Fund. Upon receipt by the
Escrow Agent on or before the last day the Escrow Fund remains in existence of a
certificate signed by the Chief Executive Officer, Chief Operating Officer, or
Chief Financial Officer of Parent ("Officer's Certificate"), a copy of which, at
that time, will also be provided to the Company Stockholder pursuant to the
procedure for notice set forth in Article XIII:

              (a) stating that Parent has a Loss and that Parent is entitled to
     indemnification out of the Escrow Fund pursuant to this Escrow Agreement
     and the Agreement and Plan of Merger; and

              (b) specifying in reasonable detail (i) the amount of the Loss;
     (ii) the individual items of Losses included in the amount so stated; (iii)
     the basis for the Loss and (iv) the section of the Agreement and Plan of
     Merger (or such other applicable instrument contemplated thereby) to which
     such claim relates;

the Escrow Agent shall, upon receipt of written evidence signed by the Company
Stockholder of his consent to the removal of that portion of the Escrow Fund
equal to the amount of Losses in respect of any claim made in the Officer's
Certificate (the "Stockholder Acknowledgment"), deliver to Parent, as promptly
as practicable, out of the Escrow Fund, such number of shares of Parent Common
Stock having a value equal to the amount of such Losses. Upon delivery of such
an amount from the Escrow Fund, Parent will become the lawful owner of such
Parent Common Stock. The Escrow Agent shall remove no amount out of the Escrow
Fund pursuant to this Article III unless the Escrow Agent shall have received
the Officer's Certificate specified in this Section 3.1 to make such delivery
and the Stockholder Acknowledgment. The parties hereto acknowledge and agree
that in the event that the Escrow Agent requires clarification or confirmation
regarding the number of shares of Parent Common Stock to be delivered hereunder
or regarding any other aspect relating to or arising from an Officer's
Certificate, the Escrow Agent may contact the Company Stockholder and the party
who executed the Officer's Certificate on behalf of Parent.
              Section 3.2. Claims. Any claim by Parent against the Escrow Fund
made in an Officer's Certificate pursuant to this Article III shall be referred
to herein as a "Claim" or, if multiple, "Claims."

              Section 3.3. Valuation of Parent Common Stock. Parent and the
Company Stockholder hereby agree that for the purposes of this Escrow Agreement,
the




                                       2

<PAGE>   3
Parent Common Stock shall be valued at $16.00 per share.
                                   ARTICLE IV
                             RESOLUTION OF DISPUTES

              SECTION 4.1. If the Company Stockholder shall not have consented
in writing through the Stockholder Acknowledgment within five days of receipt of
a copy of the Officer's Certificate, the Company Stockholder and Parent shall
attempt in good faith to agree upon the rights of the respective parties with
respect to each such Claim. If the Company Stockholder and Parent so agree, a
memorandum setting forth such agreement shall be prepared and signed by Parent
and the Company Stockholder and will be presented to the Escrow Agent along with
an Officer's Certificate.

              SECTION 4.2. If no such agreement can be reached after good faith
negotiation and, in any event, 30 days after the Company Stockholder refuses to
consent to the removal of a portion of the Escrow Fund for the amount of a Loss
in respect of any Claim made by Parent (a "Dispute"), such Dispute shall be
submitted to mandatory and binding arbitration. The arbitration shall be
pursuant to the Commercial Arbitration Rules of the American Arbitration
Association (the "AAA"). The arbitration hearing shall be held in such location
as the parties may mutually agree or, in the absence of mutual agreement, in
Denver, CO. The arbitration panel will have no power or authority, under the
Commercial Arbitration Rules of the AAA or otherwise, to relieve the parties
from their agreement hereunder to arbitrate or otherwise to amend or disregard
any provision of this Agreement, including without limitation, the provisions of
this Section 4.2. Any award rendered by the arbitration panel will be final,
conclusive and binding upon the parties and any judgment hereon may be entered
and enforced in any court of competent jurisdiction.

                                   ARTICLE V
                           EXPIRATION OF ESCROW PERIOD
              If, upon expiration of the Escrow Period, Parent shall have
asserted a Claim and such Claim is pending or unresolved at the time of such
expiration, the Escrow Agent shall retain in the Escrow Fund that portion of the
Escrow Fund, net of any distributions made or to be made with respect to other
Claims, equal in value to the Loss asserted in such Claim until such matter is
resolved. If it is determined that Parent is entitled to recovery on account of
such Claim, the Escrow Agent shall deliver or cause to be delivered the amount
of Parent Common Stock having a value equal to the amount due and payable with
respect to such Claim, determined as provided in Section 3.3 hereof. Upon such
delivery Parent will be the lawful owner of that amount of Parent Common Stock.
In the event that no Claims are made or are pending by or at the end of the
Escrow Period, the remaining portion of the Escrow Fund, shall be disbursed to
the Company Stockholder subject to the prior payment by the Company Stockholder
to the Escrow Agent of any amounts owing by the Company Stockholder under
Article XVI.


                                       3

<PAGE>   4

                                   ARTICLE VI
                       SCHEDULE FOR RELEASE OF ESCROW FUND

              If any amount is paid by the Escrow Agent pursuant to a Claim and
the actual Losses with respect to such Claim are at the time determined to be
less than such payment, the Parent shall promptly deposit such excess back into
the Escrow Fund, if this Escrow Agreement is then in effect, or transfer such
excess to the Company Stockholder, if this Escrow Agreement is no longer in
effect.

                                  ARTICLE VII
                   ESCROW AGENT'S RIGHTS AND RESPONSIBILITIES

              To induce the Escrow Agent to act hereunder, it is further agreed
that:

              (a) Any recitals contained in this Escrow Agreement shall be
     deemed to be those of the principals and not those of the Escrow Agent.

              (b) The Escrow Agent shall not be under any duty to give the
     property held hereunder any greater degree of care than it gives its own
     similar property.

              (c) The Escrow Agent may engage legal counsel who may not be
     counsel for any party to the Escrow Agreement and may act upon advice of
     counsel in reference to any matter connected herewith and shall not be
     liable for any acts or omissions taken or suffered pursuant to the opinion
     of such counsel. The fees and expenses of such counsel shall be deemed to
     be a proper expense for which the Escrow Agent will have a lien against the
     Escrow Fund.

              (d) The Escrow Agent shall not be liable in any respect on
     account of the identity, authority or rights of the parties executing or
     delivering or purporting to execute or deliver this Escrow Agreement or any
     documents or papers deposited or called for hereunder. The Escrow Agent
     shall be protected in acting upon any notice, request, consent,
     certificate, order, affidavit, letter, telegram or other paper or document
     believed by it to be genuine and correct and to have been signed or sent by
     the proper person or persons.

              (e) The Escrow Agent shall not be liable for the outlawing of any
     rights under any statute of limitations with respect to this Escrow
     Agreement or any documents deposited with the Escrow Agent.

              (f) The Escrow Agent is hereby expressly authorized to disregard
     any and all warnings given by any of the parties hereto or by any other
     person, excepting only orders or process of courts of law, and is hereby
     expressly authorized to comply with and obey orders, judgments or decrees
     of any court. In case the Escrow Agent obeys or complies with any such
     order, judgment or decree of any court, the Escrow Agent shall not be
     liable to any of the parties hereto or to any other person by reason of
     such compliance, notwithstanding any such order, judgment or decree being
     subsequently reversed, modified, annulled, set aside, vacated or found to
     have been entered without jurisdiction.

              (g) The Escrow Agent is authorized to rely on the written
     instructions of the Company Stockholder as being the acts of the Company
     Stockholder.



                                        4

<PAGE>   5

              (h) The duties of the Escrow Agent shall be as expressed under
     this Escrow Agreement, and the Escrow Agent shall have no implied duties.
     The permissive right or power to take any action shall not be construed as
     a duty to take action under any circumstances, and the Escrow Agent shall
     not be liable except in the event of its gross negligence or willful
     misconduct.

              (i) The Escrow Agent shall not be called upon to advise any party
     as to its rights and obligations hereunder.

              (j) In consideration of its acceptance of the appointment as the
     Escrow Agent, and except with respect to the Escrow Agent's own gross
     negligence or willful misconduct or acts or omissions by the Escrow Agent
     not in good faith, the other parties hereto agree, jointly and severally,
     to indemnify and hold the Escrow Agent harmless as to any loss or liability
     incurred by it to any person, firm or corporation by reason of its having
     accepted the same or in carrying out any of the terms hereof, and to
     reimburse the Escrow Agent for all its expenses, including attorney's fees,
     incurred by reason of its position hereunder or actions taken pursuant
     hereto. The Escrow Agent shall have no liability under, or duty to inquire
     into, the terms and provisions of this Escrow Agreement, and it is agreed
     that its duties are purely ministerial in nature and that the Escrow Agent
     shall incur no liability whatsoever except for willful misconduct or gross
     negligence so long as it has acted in good faith. This paragraph (j) shall
     survive the termination of the Escrow Agreement.

              (k) The Escrow Agent may execute any of the duties under this
     Escrow Agreement by or through agents or receivers.

              (l) Unless specifically required by this Escrow Agreement, the
     Escrow Agent shall not be required to give any bond or surety or report to
     any court despite any statute, custom or rule to the contrary.

              (m) In the event the Escrow Agent becomes involved in litigation
     by reason hereof, it is hereby authorized to deposit with the clerk of the
     court in which the litigation is pending any and all funds, securities or
     other property held by it pursuant hereto, less its fees, expenses and
     advances, and thereupon shall stand fully relieved and discharged of any
     further duties hereunder. Also, in the event the Escrow Agent is threatened
     with litigation by reason hereof, it is hereby authorized to implead all
     interested parties in any court of competent jurisdiction and to deposit
     with the clerk of such court any such funds, securities or other property
     held by it pursuant hereto, less its fees, expenses and advances, and
     thereupon shall stand fully relieved and discharged of any further duties
     hereunder.

              (n) The Escrow Agent shall not be obligated to risk its own funds
     in the administration of the Escrow Fund and shall have a lien against any
     funds, securities or other property in its possession or control for its
     fees, expenses and advancements. The Escrow Agent need not take any action
     under this Escrow Agreement which may involve it in any expense or
     liability until indemnified to its satisfaction for any expense or
     liability it reasonably believes may occur.



                                        5

<PAGE>   6

                                  ARTICLE VIII
                                     RECORDS

              The Escrow Agent shall maintain a record of all Claims against the
Escrow Fund filed with it pursuant to Article III, a record of all such Claims
which shall become payable as provided in Article III or IV and a record of all
payments from the Escrow Fund to Parent.

                                   ARTICLE IX
                           RESIGNATION OF ESCROW AGENT

              The Escrow Agent, or any successor, may resign as Escrow Agent
hereunder by giving 30 days' written notice thereof to the Company Stockholder
and Parent by registered or certified mail. Such resignation shall become
effective following such written notice upon the earlier of the appointment by
Parent and the Company Stockholder of a successor escrow agent that accepts the
appointment and agrees to be bound by the provisions of an agreement
substantially similar to this Escrow Agreement or the expiration of 30 days
thereafter. Upon the effectiveness of such resignation, all duties hereunder of
the Escrow Agent so resigning shall cease, other than the duty to account in
accordance with Article VIII. The Company Stockholder and Parent shall have the
right to terminate the appointment of the Escrow Agent hereunder by giving
written notice thereof to the Escrow Agent, specifying the date upon which such
termination shall take effect. A condition precedent to such termination shall
be the designation of a successor escrow agent, selected by Parent and the
Company Stockholder, that has accepted the appointment and agreed to be bound by
the provisions of an escrow agreement substantially similar to this Escrow
Agreement. In event of such termination, the Escrow Agent shall turn over and
deliver to such successor escrow agent the Escrow Fund, and any other sums and
the records and instruments held by it under this Escrow Agreement and render
the accounting required by Article VIII. Notwithstanding the appointment of a
successor escrow agent, the provisions of Article XVI shall govern with respect
to Parent's liability for any fees incurred with respect to the administration
of the Escrow Fund or charged by any escrow agent.

                                   ARTICLE X
                                     VOTING

              During the term of this Escrow Agreement, the Company Stockholder
shall be deemed the owner of and shall have voting power over all Parent Common
Stock in the Escrow Fund.

                                   ARTICLE XI
                           DIVIDENDS AND DISTRIBUTIONS

              During the term of this Escrow Agreement any dividends or other
distributions on the Parent Common Stock that are made in the form of cash or
any other form of property, except for ownership rights in the Company or any
subsidiary thereof, shall be distributed to the Company Stockholder. During the
term of this Escrow Agreement any dividends or other distributions on the Parent
Commons Stock that are made in the form of capital stock or any other form of
ownership interest in the Company



                                        6

<PAGE>   7

or any of its subsidiaries shall remain in the Escrow Fund until the end of the
term of this Escrow Agreement.

                                   ARTICLE XII
                                 PARENT RIGHTS
              Parent's right to payment for Losses is, in all cases, in addition
to and not in substitution of any other rights or remedies available to Parent
under the Agreement and Plan of Merger, any other agreement in respect of the
transactions contemplated thereby, or by operation of law or in equity,
including the right to specific performance or injunctive relief.

                                  ARTICLE XIII
                                     NOTICES

              All notices and other communications pursuant to this Escrow
Agreement shall be in writing and shall be deemed given if delivered personally,
sent by a nationally recognized overnight courier, or mailed by registered or
certified mail (return receipt requested), postage prepaid, or sent by facsimile
(followed with a copy sent by courier or registered or certified mail return
receipt requested) to the parties at the following addresses (or at such other
address for a party as shall be specified by notice hereunder):

                            To Parent:    AppliedTheory Corp.
                                          40 Cutter Mill Road, Suite 405
                                          Great Neck, NY 11021


                       with a copy to:    Dewey Ballantine LLP
                                          1301 Avenue of the Americas
                                          New York, NY 10019-6092
                                          Attention: Frank E. Morgan, II, Esq.

           To the Company Stockholder:    James G. Couch
                                          Box 8343
                                          Incline Village, NV 89452
All such notices and other communications shall be deemed to have been received
(a) in the case of personal delivery, on the date of such delivery, (b) in the
case of delivery by nationally recognized overnight courier, on the business day
following dispatch, (c) in the case of mailing, on the third business day
following such mailing, and (d) in the case of a facsimile, when the party
receiving such facsimile shall have confirmed receipt of the communication (or
when the copy sent by courier or registered or certified mail shall have been
deemed to have been received pursuant to clause (a), (b) or (c)).

                                  ARTICLE XIV
                             SUCCESSORS AND ASSIGNS

              This Escrow Agreement shall inure to the benefit of and be binding
upon the successors and assigns of the parties hereto.



                                        7


<PAGE>   8

                                   ARTICLE XV
                                  GOVERNING LAW

              This Escrow Agreement shall be governed by and interpreted in
accordance with the laws of the State of New York without regard to the choice
of law principles thereof.

                                   ARTICLE XVI
                                   ESCROW FEES

              The Company Stockholder and Parent will each be responsible for up
to one half of any administration and other fees charged by the Escrow Agent and
any successor escrow agent up to four thousand dollars ($4,000), or up to two
thousand dollars ($2,000) each; provided, that the Company Stockholder shall be
solely responsible for any administration and other fees charged by the Escrow
Agent in excess of four thousand dollars ($4,000).

                                  ARTICLE XVII
                                    EXPENSES

              In the event of any dispute that results in a suit or other legal
proceeding to construe or enforce any provision of this Escrow Agreement or
because of an alleged breach, default or misrepresentation in connection with
any of the provisions of this Escrow Agreement, the parties agree that each
party shall be responsible for its own attorneys' fees and other costs incurred
in any action or proceeding.

                                  ARTICLE XVIII
                                  COUNTERPARTS

              This Escrow Agreement may be executed in any number of
counterparts, each of which when so executed shall constitute an original
hereof, but all of which together shall constitute one agreement.



                                        8

<PAGE>   9

              IN WITNESS WHEREOF, the undersigned have executed this Escrow
Agreement to be effective as of the day and year first above written.

                                         APPLIEDTHEORY CORPORATION:

                                         By:_____________________________
                                            Name:   Danny E. Stroud
                                            Title: Vice President - Corporate
                                                   Development and Western
                                                   Operations
                                         UNITED STATES TRUST COMPANY OF NEW YORK

                                         By:_____________________________
                                            Name:________________________
                                            Title:_________________________


                                         JAMES G. COUCH:


                                         By:_____________________________
                                            Name:________________________


                                         APPLIEDTHEORY REEF
                                         ACQUISITION CORP.:


                                         By:___________________________
                                            Name: Danny E. Stroud
                                            Title: Vice President - Corporate
                                                   Development and Western
                                                   Operations

<PAGE>   1
                                                                     EXHIBIT 2.3

================================================================================




                              PUT OPTION AGREEMENT

                                      among

                            APPLIEDTHEORY CORPORATION

                                       and

                                 James G. Couch

                                       and

                               OTHER STOCKHOLDERS

================================================================================




<PAGE>   2
              THIS PUT OPTION AGREEMENT, dated as of January 5, 2000 (this
"Agreement"), by and between AppliedTheory Corporation, a Delaware corporation
(together with its subsidiaries "Parent"), James G. Couch and other holders of
capital stock of CRL Network Services, Inc. (each a "Stockholder" and
collectively the "Stockholders").
                              W I T N E S S E T H:

              WHEREAS, the Stockholders will acquire shares of Parent common
stock, par value $.01 per share (the "Parent Common Stock"), in connection with
that certain Agreement and Plan of Merger dated as of the date hereof between,
among others, the parties hereto (the "Merger Agreement"); and

              WHEREAS, as a condition to the Merger Agreement, the Parent has
agreed to enter into this Agreement whereby, inter alia, the Parent is granting
an option to the Stockholders such that they can require the Parent to purchase
the Parent Common Stock from the Stockholders at specified times and in
specified circumstances, all as set forth in this Agreement;

              NOW, THEREFORE, in consideration of the premises, the
representations, warranties and agreements contained herein and other good and
valuable consideration, the receipt and adequacy of which are hereby
acknowledged, the parties hereto hereby agree as follows:

                                   ARTICLE I

              DEFINITIONS AND RULES OF INTERPRETATION

              Section 1.1. Definitions.

              All capitalized terms used herein shall, unless defined herein,
have the respective meanings set forth herein or, in the absence of such a
definition, in the Merger Agreement.

              Section 1.2. Rules of Interpretation.

              In this Agreement, unless the context shall otherwise require:

              (a) the headings are inserted for convenience only and shall not
define or limit the provisions nor affect the interpretation hereof;

              (b) words denoting the singular only shall include the plural and
vice versa;

              (c) "include" and "including" are not limiting;




<PAGE>   3

              (d) "Proportionate Share" shall mean that proportion of the total
Parent Common Stock delivered at the Closing of the Merger Agreement which the
respective Stockholder shall have received from Parent in connection with such
Closing; and

              (e) all references to documents are to those documents as amended,
modified and supplemented from time to time.

                                   ARTICLE II

                                   FIRST PUT OPTION

              Section 2.1. Granting of First Put Option.

              For good and valuable consideration, the receipt and sufficiency
of which are hereby acknowledged, Parent grants to each Stockholder an option
which shall be exercisable only on the one year anniversary of the date hereof
(the "First Put Exercisability Date") and under which such Stockholder may
require Parent to purchase Parent Common Stock from such Stockholder for the
Exercise Price (as hereinafter defined) in accordance with the terms of this
Agreement (the "First Put Option"). Subject to the limitation set forth in the
last sentence of this Section 2.1, the First Put Option may be exercised by each
such Stockholder in accordance with the provisions of this Agreement with
respect to any number of shares of Parent Common Stock up to such Stockholder's
Proportionate Share of $5,000,000 in value (based on the Exercise Price as
hereinafter defined) of Parent Common Stock. For purposes of this Section 2.1,
the purchase price payable by Parent for such Parent Common Stock shall be
$16.00 per share (the "Exercise Price"). The amount of shares available under
the First Put Option shall be reduced on a one-for-one basis in respect of any
shares of Parent Common Stock which are sold by such Stockholder prior to the
First Put Exercisability Date over and above an aggregate of 10% of the Parent
Common Stock received by such Stockholder as Stock Consideration under the
Merger Agreement.

              Section 2.2. Expiration of First Put Option.

              (a) In the event that the average of the closing prices for the
Parent Common Stock as reported on the Nasdaq-NMS for any period of at least 30
consecutive days commencing 180 days after the date hereof shall exceed 125% of
the per share Exercise Price (the "First Put Option Target"), the First Put
Option shall terminate and shall no longer be exercisable; provided, however
that on such date when the foregoing condition shall have been satisfied, if (i)
a Required Registration Notice (as defined in the Registration Rights Agreement)
shall have been delivered to the Company pursuant to the Registration Rights
Agreement at least 30 days before such date, and (ii) a registration statement
filed pursuant to such Required Registration Notice shall not have been
effective for at least eighteen (18) days within the 30-day period referred to
above, then the First Put Option shall not terminate and shall remain
outstanding and exercisable until such time as the First Put Option Target is
met and a registration statement shall have been in effect for at least eighteen
(18) days.



                                        2

<PAGE>   4

              (b) If the First Put Option shall not have otherwise expired,
terminated or been exercised, such First Put Option shall expire and terminate
on the day following the one year anniversary of the date hereof.

              Section 2.3. Exercise of First Put Option.

              The First Put Option may be exercised by the applicable
Stockholder serving a notice upon Parent (a "First Put Option Notice") at any
time up to and including the First Put Exercisability Date; provided, that the
First Put Option may not be exercised until the First Put Exercisability Date.

              Section 2.4. Completion of Sale of Parent Common Stock.

              (a) If there is to be a sale and purchase of Parent Common Stock
pursuant to the exercise of the First Put Option under Section 2.3, the
completion of the sale and purchase shall take place on the First Put
Exercisability Date (or, if such date is not a Business Day, on the next
Business Day) at 10:00 a.m. New York time (or at such other time to be mutually
agreed upon by the parties hereto) at such place to be mutually agreed upon by
the parties hereto.

              (b) At the completion of any sale and purchase of the Parent
Common Stock pursuant to the exercise of the First Put Option on the First Put
Exercisability Date:

                         (i)  the respective Stockholder shall deliver to
          Parent or its nominee a duly executed stock certificate (the
          "Certificate"), completed in the name of such Stockholder, in respect
          of the Parent Common Stock against payment of the Exercise Price by
          Parent; and

                         (ii) Parent shall accept (or cause its nominee to
          accept) delivery of such Certificate and effect payment of the
          applicable consideration to an account identified by such Stockholder
          in writing to Parent. For the avoidance of doubt, it is hereby
          understood and agreed that receipt of the Exercise Price shall be
          confirmed by such Stockholder prior to the delivery by such
          Stockholder to Parent of the Certificate.

              (c) The parties hereto agree to do such further things and to
execute such further documents as may be necessary so that Parent or its nominee
may obtain on payment of the Exercise Price title to the applicable Parent
Common Stock free of any liens, encumbrances or other security interests.

                                  ARTICLE III

                                  SECOND PUT OPTION

              Section 3.1. Granting of Second Put Option.

              For good and valuable consideration, the receipt and sufficiency
of which are hereby acknowledged, Parent grants to each Stockholder an option
which shall be



                                        3

<PAGE>   5

exercisable only on the two year anniversary of the date hereof (the "Second Put
Exercisability Date") and under which such Stockholder may require Parent to
purchase Parent Common Stock from such Stockholder for the Exercise Price in
accordance with the terms of this Agreement (the "Second Put Option"). Subject
to the limitation set forth in the last sentence of this Section 3.1, the Second
Put Option may be exercised by each such Stockholder in accordance with the
provisions of this Agreement with respect to any number of shares of Parent
Common Stock up to such Stockholder's Proportionate Share of $5,000,000 in value
(based on the Exercise Price) of Parent Common Stock. The amount of shares
available under the Second Put Option shall be reduced on a one-for-one basis in
respect of any shares of Parent Common Stock which are sold by such Stockholder
prior to the Second Put Exercisability Date over and above an aggregate of 50%
of the Parent Common Stock received by such Stockholder as Stock Consideration
under the Merger Agreement.

              Section 3.2. Expiration of Second Put Option.

              (a) In the event that the average of the closing prices for the
Parent Common Stock as reported on the Nasdaq-NMS for any period of at least 30
consecutive days commencing 180 days after the date hereof shall exceed 150% of
the per share Exercise Price, the Second Put Option shall terminate and shall no
longer be exercisable; provided, that at that time a registration statement
filed pursuant to a Required Registration Notice shall have been effective for
at least eighteen (18) days within the 30-day period referred to above beginning
on the 180th day after the date hereof.

              (b) If the Second Put Option shall not have otherwise expired,
terminated or been exercised, such Second Put Option shall expire and terminate
on the day following the two year anniversary of the date hereof.

              Section 3.3. Exercise of Second Put Option.

              The Put Option may be exercised by the applicable Stockholder
serving a notice upon Parent (a "Second Put Option Notice") at any time up to
and including the Second Put Exercisability Date; provided, that the Second Put
Option may not be exercised until the Second Put Exercisability Date.

              Section 3.4. Completion of Sale of Parent Common Stock.

              (a) If there is to be a sale and purchase of Parent Common Stock
pursuant to the exercise of the Second Put Option under Section 3.3, the
completion of the sale and purchase shall take place on the Second Put
Exercisability Date (or, if such date is not a Business Day, on the next
Business Day) at 10:00 a.m. New York time (or at such other time to be mutually
agreed upon by the parties hereto) at such place to be mutually agreed upon by
the parties hereto.

              (b) At the completion of any sale and purchase of the Parent
Common Stock pursuant to the exercise of the Second Put Option on the Second Put
Exercisability Date:



                                        4

<PAGE>   6

                         (i)  the respective Stockholder shall deliver to Parent
          or its nominee a duly executed stock certificate, completed in the
          name of such Stockholder, in respect of the Parent Common Stock
          against payment of the Exercise Price by Parent; and

                         (ii) Parent shall accept (or cause its nominee to
          accept) delivery of such Certificate and effect payment of the
          applicable consideration to an account identified by such Stockholder
          in writing to Parent. For the avoidance of doubt, it is hereby
          understood and agreed that receipt of the Exercise Price shall be
          confirmed by such Stockholder prior to the delivery by such
          Stockholder to Parent of the Certificate.

              (c) The parties hereto agree to do such further things and to
execute such further documents as may be necessary so that Parent or its nominee
may obtain on payment of the Exercise Price title to the applicable Parent
Common Stock.

                                   ARTICLE IV

                                   MISCELLANEOUS

              Section 4.1. Counterparts.

              This Agreement may be executed in one or more counterparts, each
of which shall be an original but all of which together shall constitute but one
and the same agreement.

              Section 4.2. Further Assurances.

              Each of the parties hereto agrees to cooperate and take such
further action and to execute and deliver such additional instruments and
documents as any other party hereto may from time to time reasonably request for
the purposes of giving effect to the terms of this Agreement or any other
document or agreement arising under the Merger Agreement.

              Section 4.3. Governing Law.

              THIS AGREEMENT SHALL BE GOVERNED BY, AND SHALL BE CONSTRUED IN
ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK WITHOUT REGARD TO PRINCIPLES
OF CONFLICT OF LAWS.

              Section 4.4. Notices.

              Any notice, request, demand or other communication under this
Agreement shall be in writing or by facsimile transmission (provided that in the
case of facsimile transmission it shall be confirmed in writing simultaneously
dispatched) addressed to the relevant party for the attention of the appropriate
person and once given or made shall (except as otherwise specified herein) be
irrevocable. Without prejudice to



                                        5

<PAGE>   7

any other effective mode of service, the same shall be deemed to have been
sufficiently served:

       in the case of notice to each Stockholder if sent to the applicable
       Stockholder at:

              James G. Couch
              Box 8343
              Incline Village, NV
              89452
              Tel.:
                   --------------
              Fax:
                  --------------

              and to such other address, marked for the attention of the
              applicable Stockholder, as each Stockholder may from time to time
              notify in writing to Parent;

       in the case of a notice to Parent if sent to it at:

              AppliedTheory Corporation
              40 Cutter Mill Road, Suite 405
              Great Neck, NY 11021
              Attn: Danny E. Stroud,  VP Corporate
                    Development & Western Operations

              Tel.: (516) 466-8422
              Fax:  (516) 466-8650

              or to such other address and/or marked for the attention of such
              other person as Parent may from time to time notify in writing
              the Stockholders; and

              Any facsimile transmission (in respect of which receipt has been
acknowledged by telephone or facsimile transmission) shall be deemed to have
been received at the time of dispatch provided that dispatch occurred between
9.00 a.m. and 5.00 p.m. on a Business Day in the place of receipt of the
relevant notice, failing which it shall be deemed to have been received if
dispatched prior to 9.00 a.m. on a Business Day at the commencement of business
on that Business Day, and if dispatched after 5.00 p.m. on a Business Day or at
any time on a day that is not a Business Day, at the commencement of business on
the next Business Day in the place of receipt of the relevant notice. A written
notice shall be treated as received when actually received (without reference to
time of receipt of any copies, provided such copies have been sent).

              Section 4.5. Amendments.

              This Agreement may be amended only by a written instrument
executed by the parties hereto or their respective successors or permitted
assigns.



                                        6

<PAGE>   8

              Section 4.6. Assignment.

              The Stockholders agree and confirm that they may not assign, sell,
transfer or otherwise dispose of any or all of the Parent Common Stock held by
them (or any beneficial interest therein) or all or any part of their rights and
obligations under any of the documents or agreements arising under the Merger
Agreement, except to the extent not prohibited by such documents or agreements,
including the Lock-Up.

              Section 4.7. Severability.

              Each of the provisions in this Agreement shall be severable and
distinct from the others and the illegality, invalidity or unenforceability of
any provision under the law of any jurisdiction shall not affect or impair the
legality, validity or enforceability of any other provision in that jurisdiction
nor the legality, validity or enforceability of any provision under the law of
any other jurisdiction.

              Section 4.8. Waiver.

              The failure of any party hereto to enforce at any time any of the
provisions of this Agreement shall in no way be construed to be a waiver of any
such provision, nor in an way to affect the validity of this Agreement or any
part hereof or the right of such party thereafter to enforce each and every such
provisions. No waiver of any breach hereof or non-compliance herewith shall be
held to be a waiver of any other or subsequent breach hereof or non-compliance
herewith.



                                        7

<PAGE>   9

              IN WITNESS WHEREOF, the parties hereto have caused this Agreement
to be duly executed by their respective duly authorized officers as of the date
first above written.

                               APPLIEDTHEORY CORPORATION

                               By:
                                  --------------------------
                                   Name:   Danny E. Stroud
                                   Title: Vice President - Corporate Development
                                          Development and Western Operations


                               --------------------------
                                      James G. Couch


                               --------------------------
                               Name:


                               --------------------------
                               Name:


                               --------------------------
                               Name:


                               --------------------------
                               Name:


                               --------------------------
                               Name:


                               --------------------------
                               Name:

<PAGE>   1
                                                                     EXHIBIT 2.4

                          REGISTRATION RIGHTS AGREEMENT
                                January 5, 2000
To James G. Couch and any other
holders of Registerable Stock as of
the date of this Agreement who are
party to this Agreement and any
transferee of Registerable Stock who
satisfies the conditions provided in
Section 10(a) hereof ("Stockholders")

                                    RECITALS

WHEREAS:      The Stockholders will receive from the Company shares of the
              Company's Common Stock pursuant to the Merger Agreement; and

WHEREAS:      As a condition to the Closing of the merger contemplated by the
              Merger Agreement, the Company has agreed to grant to the
              Stockholders registration rights in accordance with this
              Registration Rights Agreement (the "Agreement") with respect to
              certain securities of the Company held by the Stockholders.

                                    AGREEMENT

              NOW, THEREFORE, it is agreed as follows:

              1. Certain Definitions. As used in this Agreement, the following
terms shall have the following respective meanings:

                 "Commission" shall mean the Securities and Exchange Commission,
     or any other federal agency at the time administering the Securities Act.

                 "Common Stock" shall mean all shares of Common Stock, par
     value $.01 per share of the Company.

                 "Company" shall mean AppliedTheory Corporation.

                 "Exchange Act" shall mean the Securities Exchange Act of 1934,
     as amended, or any similar federal statute, and the rules and regulations
     of the Commission thereunder, all as the same shall be in effect at the
     time.
                 "Merger Agreement" shall mean the Agreement and Plan of Merger
     dated as of December 3, 1999 by and among the Company, James G. Couch and
     certain other parties.
                 "Registration Expenses" shall mean the expenses so described in
     Section 5.




<PAGE>   2

                 "Registerable Stock" shall mean those shares of Common Stock
     which are not held in the Escrow Fund, but only so long as such shares
     continue to be Restricted Stock.

                 "Restricted Stock" shall mean any Registerable Stock until such
     time as such Registerable Stock (i) has been effectively registered under
     the Securities Act or (ii) has been publicly sold pursuant to Rule 144 (or
     any similar provision then in force) under the Securities Act.

                 "Securities Act" shall mean the Securities Act of 1933, as
     amended, or any similar federal statute, and the rules and regulations of
     the Commission thereunder, all as the same shall be in effect at the time.

                 "Selling Expenses" shall mean the expenses described in Section
     5.

                 "Unregistered Common Stock" shall mean all shares of Common
     Stock which are beneficially owned by the Stockholders as of the date
     hereof and have not been registered under the Securities Act.

          All other capitalized terms used herein shall, unless defined, have
the respective meanings set forth herein or, in the absence of such a
definition, in the Merger Agreement.

          2. Restrictive Legend. Each certificate representing Common Stock
shall, except as otherwise provided in this Section 2, be stamped or otherwise
imprinted with a legend substantially in the following form:
             "THIS SECURITY IS SUBJECT TO RESTRICTIONS
             REGARDING THE SALE THEREOF UNDER AN AGREEMENT
             AND PLAN OF MERGER DATED DECEMBER 3, 1999
             BETWEEN THE HOLDER THEREOF AND PARENT
             CORPORATION, HAS NOT BEEN REGISTERED UNDER THE
             SECURITIES ACT OF 1933 AND MAY NOT BE
             TRANSFERRED OR OTHERWISE DISPOSED OF UNLESS IT
             HAS BEEN REGISTERED UNDER THAT ACT OR AN
             EXEMPTION FROM REGISTRATION IS AVAILABLE."
A certificate shall not bear such legend if in the opinion of counsel
satisfactory to the Company the securities being sold thereby may be publicly
sold without registration under the Securities Act.

          3. Incidental Registration.

          (a) Beginning on the Closing and until the one year anniversary of the
     Closing, if the Company proposes to register any of its securities under
     the Securities Act for sale to the public, whether for its own account or
     for the account of other security holders or both (except with respect to
     registration statements on Forms S-4, S-8 or



                                       2

<PAGE>   3

     another form not available for registering the Registerable Stock for sale
     to the public), each such time it will give written notice of its intention
     to do so to all holders of outstanding Registerable Stock who are party to
     this Agreement. Upon the written request of any such holder, received by
     the Company within 30 days after the giving of any such notice by the
     Company, to register any of its Registerable Stock (which request shall
     state the intended method of disposition thereof), the Company shall,
     subject to the following sentence, cause the Registerable Stock as to which
     registration shall have been so requested to be included in the securities
     to be covered by the registration statement proposed to be filed by the
     Company, all to the extent requisite to permit the sale or other
     disposition by the holder (in accordance with its written request) of such
     Registerable Stock so registered. In the event that any registration
     pursuant to this Section 3 shall be, in whole or in part, an underwritten
     public offering of Common Stock, the number of shares of Registerable Stock
     to be included in such an underwriting may be reduced (pro rata among the
     requesting holders based upon the number of shares of Registerable Stock
     owned by such holders) if and to the extent that the managing underwriter
     shall be of the opinion that such inclusion would adversely affect the
     marketing of the securities to be sold by the Company therein; provided,
     however, that such number of shares of Registerable Stock shall not be
     reduced if any shares are to be included in such underwriting for the
     account of any person other than the Company or requesting holders of
     Registerable Stock.

          (b) Notwithstanding the foregoing provisions, the Company may withdraw
     any registration statement referred to in this Section 3 without thereby
     incurring any liability to the holders of Registerable Stock except for the
     Company's obligation to pay any registration expenses incurred in relation
     to such a withdrawn registration.

          4. Required Registration.

          (a) At any time during the period beginning 150 days following the
     Closing and ending 365 days following the Closing, Stockholders who are
     holders of a majority of the Registerable Stock may deliver a written
     request (a "Required Registration Notice") to the Company demanding
     registration under the Securities Act of up to 50% of the shares of
     Registerable Stock delivered by the Company as Merger Consideration under
     the Merger Agreement and held by such requesting holder or holders for sale
     in the manner specified in such notice, such registration to take effect no
     earlier than 180 days following the Closing and no later than 365 days
     following the Closing and to remain in effect until the later of 365 days
     following the Closing or 90 days following its effectiveness.

          (b) Following receipt of any notice under this Section 4, the Company
     shall immediately give written notice of the request for registration to
     all Stockholders who hold Registerable Stock and who were not included in
     the Required Registration Notice. The Company shall then use its best
     efforts to include in a registration statement under the Securities Act for
     public sale in accordance with the method of disposition specified in the
     Required Registration Notice, the number of shares of Registerable Stock
     specified in such notice from each such requesting Stockholder and in all
     responses from other Stockholders which are received within 30 days of the
     Company's notifying such



                                        3

<PAGE>   4

     Stockholders of the Required Registration Notice; provided, that the
     maximum number of shares of Registerable Stock of any Stockholder which the
     Company shall be required to register hereunder (the "Registration
     Maximum") shall be 50% of the shares of Common Stock that were delivered to
     such Stockholder as Merger Consideration in connection with the closing of
     the Merger Agreement; provided, further that the Registration Maximum shall
     be reduced on a one-for-one basis in respect of any shares of Common Stock
     sold by such Stockholder pursuant to Section 3 hereof. Upon its receipt of
     a Required Registration Notice, the Company shall take all reasonable
     efforts to ensure that a registration statement relating to such notice is
     filed with the Commission by the later to occur of (i) 30 days following
     the Company's receipt of such notice or (ii) May 1, 2000. The Company shall
     be obligated to register Registerable Stock pursuant to this Section 4 on
     one occasion only.

          (c) Prior to the effective date of any registration made by the
     Company under this Section 4, any such registration will be withdrawn if
     the Company receives a written notice to that effect, signed by all holders
     of Registerable Stock who made a request for registration under paragraphs
     (a) and (b) of this Section 4. If such a notice is delivered, the withdrawn
     registration will not qualify as the occasion where the Company is
     obligated to make a registration under paragraph (b) of this Section 4.

          (d) The Company shall be entitled to include in any registration
     statement referred to in this Section 4, for sale in accordance with the
     method of disposition specified in the Required Registration Notice, shares
     of Common Stock to be sold by the Company for its own account or for sale
     by others, except as and to the extent that, in the opinion of the managing
     underwriter (if such method of disposition shall be an underwritten public
     offering), such inclusion would adversely affect the marketing of the
     Registerable Stock to be sold.

          5. Registration Procedures. If and whenever the Company is required by
the provisions of Sections 3 and 4 to use its best efforts to effect the
registration of any shares of Registerable Stock under the Securities Act, the
Company will, as expeditiously as possible:

          (a) prepare and file with the Commission a registration statement with
     respect to such securities and use its best efforts to cause such
     registration statement to become and remain effective for the period of the
     distribution contemplated thereby (determined as hereinafter provided);

          (b) prepare and file with the Commission such amendments and
     supplements to such registration statement and the prospectus used in
     connection therewith as may be necessary to keep such registration
     statement effective for the period specified in paragraph (a) above and
     comply with the provisions of the Securities Act with respect to the
     disposition of all Registerable Stock covered by such registration
     statement in accordance with the sellers' intended method of disposition
     set forth in such registration statement for such period;

          (c) furnish to each seller of Registerable Stock and to each
     underwriter such number of copies of the registration statement and the
     prospectus included therein



                                        4

<PAGE>   5

     (including each preliminary prospectus) as such persons reasonably may
     request in order to facilitate the public sale or other disposition of the
     Registerable Stock covered by such registration statement;

          (d) use its best efforts to register or qualify the Registerable Stock
     covered by such registration statement under the securities or "blue sky"
     laws of such jurisdictions as the sellers of Registerable Stock or, in the
     case of an underwritten public offering, the managing underwriter
     reasonably shall request; provided, however, that the Company shall not for
     any such purpose be required to qualify generally to transact business as a
     foreign corporation in any jurisdiction where it is not so qualified or to
     consent to general service of process in any such jurisdiction;

          (e) use its best efforts to list the Registerable Stock covered by
     such registration statement with any securities exchange on which the
     Common Stock of the Company is then listed;

          (f) immediately notify each seller of Registerable Stock and each
     underwriter under such registration statement, at any time when a
     prospectus relating thereto is required to be delivered under the
     Securities Act, of the happening of any event of which the Company has
     knowledge as a result of which the prospectus contained in such
     registration statement, as then in effect, includes an untrue statement of
     a material fact or omits to state a material fact required to be stated
     therein or necessary to make the statements therein not misleading in light
     of the circumstances then existing;

          (g) if the offering is underwritten and at the request of any seller
     of Registerable Stock, use its best efforts to furnish on the date that
     Registerable Stock is delivered to the underwriters for sale pursuant to
     such registration: (i) an opinion dated as of such date of counsel
     representing the Company for the purposes of such registration, addressed
     to the underwriters and to such seller, stating that such registration
     statement has become effective under the Securities Act and that (A) to the
     best knowledge of such counsel, no stop order suspending the effectiveness
     thereof has been issued and no proceedings for that purpose have been
     instituted or are pending or contemplated under the Securities Act, (B) the
     registration statement, the related prospectus and each amendment or
     supplement thereof comply as to form in all material respects with the
     requirements of the Securities Act (except that such counsel need not
     express any opinion as to financial statements or other financial data
     contained therein) and (C) to such other effects as reasonably may be
     requested by counsel for the underwriters or by such seller or its counsel
     and (ii) a letter dated such date from the independent public accountants
     retained by the Company, addressed to the underwriters and to such seller,
     stating that they are independent public accountants within the meaning of
     the Securities Act and that, in the opinion of such accountants, the
     financial statements of the Company included in the registration statement
     or the prospectus, or any amendment or supplement thereof, comply as to
     form in all material respects with the applicable accounting requirements
     of the Securities Act, and such letter shall additionally cover such other
     financial matters (including information as to the period ending no more
     than five business days prior to the date of such letter) with respect to
     such registration as such underwriters reasonably may request;



                                        5

<PAGE>   6

          (h) immediately after the Company determines that any of the matters
     discussed in Section 5(g) are not true, provide the holders of Registerable
     Stock with notice to that effect; and

          (i) make available for inspection by each seller of Registerable
     Stock, any underwriter participating in any distribution pursuant to such
     registration statement, and any attorney, accountant or other agent
     retained by such seller or underwriter, all financial and other records,
     pertinent corporate documents and properties of the Company, and cause the
     Company's officers, directors and employees to supply all information
     reasonably requested by any such seller, underwriter, attorney, accountant
     or agent in connection with such registration statement.

          For purposes of Sections 4(c) and 5(a), the period of distribution of
Registerable Stock shall be deemed to extend until the earlier of the sale of
all Registerable Stock covered thereby and 120 days after the effective date
thereof.

          In connection with each registration hereunder, the sellers of
Registerable Stock will furnish to the Company in writing such information with
respect to themselves and the proposed distribution by them as reasonably shall
be necessary in order to assure compliance with federal and applicable state
securities laws.

          In connection with each registration pursuant to Sections 3 and 4
covering an underwritten public offering, the Company and each seller agree to
enter into a written agreement with the managing underwriter selected in the
manner herein provided in such form and containing such provisions as are
customary in the securities business for such an arrangement between such
underwriter and companies of the Company's size and investment stature.

          6. Expenses. All expenses incurred by the Company in complying with
Sections 3 and 4, including, without limitation, all registration and filing
fees, printing expenses, fees and disbursements of counsel and independent
public accountants for the Company, fees and expenses (including counsel fees)
incurred, in respect of the Company's obligations under this Agreement or of the
rights under this Agreement of the Stockholders, in connection with complying
with state securities or "blue sky" laws, fees of the National Association of
Securities Dealers, Inc., transfer taxes, fees of transfer agents and
registrars, costs of insurance and reasonable fees and disbursements of one
counsel for the sellers of Registerable Stock, but excluding any Selling
Expenses, are called "Registration Expenses". All underwriting discounts and
selling commissions applicable to the sale of Registerable Stock are called
"Selling Expenses".

          The Company will pay all Registration Expenses in connection with each
registration statement under Sections 3 and 4. All Selling Expenses in
connection with each registration statement under Sections 3 and 4 shall be
borne by the participating sellers in proportion to the number of shares sold by
each, or by such participating sellers other than the Company (except to the
extent the Company shall be a seller) as they may agree.



                                        6

<PAGE>   7

          7. Indemnification and Contribution.

          (a) In the event of a registration of any of the Registerable Stock
     under the Securities Act pursuant to Sections 3 and 4, the Company will
     indemnify and hold harmless each seller of such Registerable Stock
     thereunder, each underwriter of such Registerable Stock thereunder and each
     other person, if any, who controls such seller or underwriter within the
     meaning of the Securities Act, against any losses, claims, damages or
     liabilities, joint or several, to which such seller, underwriter or
     controlling person may become subject under the Securities Act or
     otherwise, insofar as such losses, claims, damages or liabilities (or
     actions in respect thereof) arise out of or are based upon any untrue
     statement or alleged untrue statement of any material fact contained in any
     registration statement under which such Registerable Stock was registered
     under the Securities Act pursuant to Sections 3 and 4, any preliminary
     prospectus or final prospectus contained therein, or any amendment or
     supplement thereof, or arise out of or are based upon the omission or
     alleged omission to state therein a material fact required to be stated
     therein or necessary to make the statements therein not misleading, and
     will reimburse each such seller, each such underwriter and each such
     controlling person for any legal or other expenses reasonably incurred by
     them in connection with investigating or defending any such loss, claim,
     damage, liability or action; provided, however, that the Company will not
     be liable in any such case if and to the extent that any such loss, claim,
     damage or liability arises out of or is based upon an untrue statement or
     alleged untrue statement or omission or alleged omission so made in
     conformity with information furnished by any such seller, any such
     underwriter or any such controlling person in writing specifically for use
     in such registration statement or prospectus.

          (b) In the event of a registration of any of the Registerable Stock
     under the Securities Act pursuant to Sections 3 and 4, each seller of such
     Registerable Stock thereunder, severally and not jointly, will indemnify
     and hold harmless the Company, each person, if any, who controls the
     Company within the meaning of the Securities Act, each officer of the
     Company who signs the registration statement, each director of the Company,
     each underwriter and each person who controls any underwriter within the
     meaning of the Securities Act, against all losses, claims, damages or
     liabilities, joint or several, to which the Company or such officer,
     director, underwriter or controlling person may become subject under the
     Securities Act or otherwise, insofar as such losses, claims, damages or
     liabilities (or actions in respect thereof) arise out of or are based upon
     any untrue statement or alleged untrue statement of any material fact
     contained in the registration statement under which such Registerable Stock
     was registered under the Securities Act pursuant to Sections 3 and 4, any
     preliminary prospectus or final prospectus contained therein, or any
     amendment or supplement thereof, or arise out of or are based upon the
     omission or alleged omission to state therein a material fact required to
     be stated therein or necessary to make the statements therein not
     misleading, and will reimburse the Company and each such officer, director,
     underwriter and controlling person for any legal or other expenses
     reasonably incurred by them in connection with investigating or defending
     any such loss, claim, damage, liability or action; provided, however, that
     such seller will be liable hereunder in any such case if and only
     to the extent that any such loss, claim, damage or liability arises out of
     or is based upon an untrue statement or alleged untrue statement or
     omission or alleged omission made in



                                        7

<PAGE>   8

     reliance upon and in conformity with information pertaining to such seller,
     as such, furnished in writing to the Company by such seller specifically
     for use in such registration statement or prospectus; provided, further,
     that the liability of each seller hereunder shall be limited to the
     proportion of any such loss, claim, damage, liability or expense which is
     equal to the proportion that the public offering price of the shares sold
     by such seller under such registration statement bears to the total public
     offering price of all securities sold thereunder, but not in any event to
     exceed the net proceeds received by such seller from the sale of
     Registerable Stock covered by such registration statement.

          (c) Promptly after receipt by an indemnified party hereunder of notice
     of the commencement of any action, such indemnified party shall, if a claim
     in respect thereof is to be made against the indemnifying party hereunder,
     notify the indemnifying party in writing thereof, but the omission so to
     notify the indemnifying party shall not relieve it from any liability which
     it may have to such indemnified party other than under this Section 6 and
     shall only relieve it from any liability which it may have to such
     indemnified party under this Section 6 if and to the extent the
     indemnifying party is prejudiced by such omission. In case any such action
     shall be brought against any indemnified party and it shall notify the
     indemnifying party of the commencement thereof, the indemnifying party
     shall be entitled to participate in and, to the extent it shall wish, to
     assume and undertake the defense thereof with counsel reasonably
     satisfactory to such indemnified party, and, after notice from the
     indemnifying party to such indemnified party of its election so to assume
     and undertake the defense thereof, the indemnifying party shall not be
     liable to such indemnified party under this Section 6 for any legal
     expenses subsequently incurred by such indemnified party in connection with
     the defense thereof other than reasonable costs of investigation and of
     liaison with counsel so selected; provided, however, that, if the
     defendants in any such action include both the indemnified party and the
     indemnifying party and the indemnified party shall have reasonably
     concluded that there may be reasonable defenses available to it which are
     different from or additional to those available to the indemnifying party
     or if the interests of the indemnified party reasonably may be deemed to
     conflict with the interests of the indemnifying party, the indemnified
     party shall have the right to select a separate counsel and to assume such
     legal defenses and otherwise to participate in the defense of such action,
     with the expenses and fees of such separate counsel and other expenses
     related to such participation to be reimbursed by the indemnifying party as
     incurred. No indemnifying party, in defense of any such action, shall,
     except with the consent of each indemnified party, consent to the entry of
     any judgment or enter into any settlement which does not include as an
     unconditional term thereof the giving, by the claimant or plaintiff, to
     such indemnified party of a release from all liability in respect to such
     action.

          (d) In order to provide for just and equitable contribution to joint
     liability under the Securities Act in any case in which either (i) any
     holder of Registerable Stock exercising rights under this Agreement, or any
     controlling person of any such holder, makes a claim for indemnification
     pursuant to this Section 6 but it is judicially determined (by the entry of
     a final judgment or decree by a court of competent jurisdiction and the
     expiration of time to appeal or the denial of the last right of appeal)
     that such indemnification may not be enforced in such case notwithstanding
     the fact that this Section 6 provides for indemnification in such case, or
     (ii) contribution under the



                                        8

<PAGE>   9

     Securities Act may be required on the part of any such selling holder or
     any such controlling person in circumstances for which indemnification is
     provided under this Section 6; then, each indemnifying party shall in lieu
     of indemnifying such indemnified party contribute to the amount paid or
     payable by such indemnified party as a result of such losses, claims,
     damages, liabilities or actions in such proportion as appropriate to
     reflect the relative fault of the Company, on the one hand, and the holders
     of such Registerable Stock, as the case may be, on the other, in connection
     with the statements and omissions which resulted in such losses, claims,
     damages, liabilities or actions as well as any other relevant equitable
     considerations, including, without limitation, the failure to give any
     notice under the third paragraph of this Section 6. The relative fault
     shall be determined by reference to, among other things, whether the untrue
     and alleged untrue statement of a material fact relates to information
     supplied by the Company, on the one hand, or the sellers of such
     Registerable Stock, as the case may be, on the other and to the parties'
     relative intent, knowledge, access to information and opportunity to
     correct or prevent such statement or omission. The Company and the sellers
     of Registerable Stock agree that it would not be just and equitable if
     contributions pursuant to this paragraph (d) of Section 6 were determined
     by pro rata allocation (even if all of the sellers of such Registerable
     Stock, as the case may be, were treated as one entity for such purpose) or
     by any other method of allocation which did not take account of the
     equitable considerations referred to above in this paragraph (d) of Section
     6. The amount paid or payable by an indemnified party as a result of the
     losses, claims, damages, liabilities or action in respect thereof, referred
     to above in this paragraph (d) of Section 6, shall be deemed to include any
     legal or other expenses reasonably incurred by such indemnified party in
     connection with investigating or defending any such action or claim;
     provided, however, that, in any such case, (A) no such holder will be
     required to contribute any amount in excess of the public offering price of
     all such Registerable Stock offered by it pursuant to such registration
     statement; and (B) no person or entity guilty of fraudulent
     misrepresentation (within the meaning of Section 12(f) of the Securities
     Act) will be entitled to contribution from any person or entity who was not
     guilty of such fraudulent misrepresentation.

          8. Changes in Common Stock. If, and as often as, there is any change
in the Common Stock by way of a stock split, stock dividend, combination or
reclassification, or through a merger, consolidation, reorganization or
recapitalization, or by any other means, appropriate adjustment shall be made in
the provisions hereof so that the rights and privileges granted hereby shall
continue with respect to the Common Stock as so changed.

          9. Representations and Warranties of the Company. The Company
represents and warrants to you as follows:

          (a) The execution, delivery and performance of this Agreement by the
     Company have been duly authorized by all requisite corporate action and
     will not violate any provision of law, any order of any court or other
     agency of government, the Certificate of Incorporation or By-laws of the
     Company or any provision of any indenture, agreement or other instrument to
     which it or any or its properties or assets is bound, conflict with, result
     in a breach of or constitute (with due notice or lapse of time or both) a
     default under any such indenture, agreement or other instrument or result
     in the



                                        9

<PAGE>   10

     creation or imposition of any lien, charge or encumbrance of any nature
     whatsoever upon any of the properties or assets of the Company.

          (b) This Agreement has been duly executed and delivered by the Company
     and constitutes the legal, valid and binding obligation of the Company,
     enforceable in accordance with its terms, subject to (i) applicable
     bankruptcy, insolvency, reorganization and moratorium laws and other laws
     of general application affecting enforcement of creditors' rights generally
     and (ii) the availability of equitable remedies as such remedies may be
     limited by equitable principles of general applicability (regardless of
     whether enforcement is sought in a proceeding in equity or at law).

          10. Miscellaneous.

          (a) All covenants and agreements contained in this Agreement by or on
     behalf of any of the parties hereto shall bind and inure to the benefit of
     the respective successors and assigns of the parties hereto (including,
     without limitation, transferees of any Registerable Stock), whether so
     expressed or not; provided, however, that registration rights conferred
     herein on the holders of Registerable Stock shall only inure to the benefit
     of a transferee of Registerable Stock if (i) there is transferred to such
     transferee at least 80% of the total shares of Registerable Stock
     originally issued pursuant to the Merger Agreement applicable to such
     holder, to the direct or indirect transferor of such transferee and (ii)
     such transferee shall execute an agreement in favor of the Company to the
     effect that such transferee agrees to be bound by, and to comply with, the
     Lock-up under the Merger Agreement.

          (b) All notices, requests, consents and other communications hereunder
     shall be in writing and shall be mailed by certified or registered mail,
     return receipt requested, postage pre-paid, or telexed, in the case of
     non-U.S. residents, addressed as follows:

              if to the Company or any other party hereto, at the address of
          such party set forth in the Merger Agreement applicable to such party;

              if to any subsequent holder of Registerable Shares, to it at such
          address as may have been furnished to the Company in writing by such
          holder;

              or, in any case, at such other address or addresses as shall have
     been furnished in writing to the Company (in the case of a holder of
     Registerable Stock) or to the holders of Registerable Stock (in the case of
     the Company) in accordance with the provisions of this paragraph.

          (c) This Agreement shall be governed by and construed in accordance
     with the laws of the State of New York.

          (d) This Agreement may be executed in two or more counterparts, each
     of which shall be deemed an original, but all of which together shall
     constitute one and the same instrument.



                                       10

<PAGE>   11

          (e) The obligations of the Company to register shares of Registerable
     Stock under Sections 3 and 4 shall terminate one year after the Closing,
     unless such obligations terminate earlier in accordance with the terms of
     this Agreement.

          (f) If any provision of this Agreement shall be held to be illegal,
     invalid or unenforceable, such illegality, invalidity or unenforceability
     shall attach only to such provision and shall not in any manner affect or
     render illegal, invalid or unenforceable any other provision of this
     Agreement, and this Agreement shall be carried out as if any such illegal,
     invalid or unenforceable provision were not contained herein.

          (g) Neither this Agreement nor any provision hereof can be modified,
     changed, discharged or terminated except upon the agreement of all parties
     hereto.



                                       11

<PAGE>   12

               IN WITNESS WHEREOF, the parties hereto have caused this Agreement
to be effective as of this __ day of December, 1999.

                         AppliedTheory Corporation

                         By:
                            ------------------------------------
                            Name:   Danny E. Stroud
                            Title: Vice President - Corporate Development and
                                   Western Operations

STOCKHOLDERS:



- ------------------
James G. Couch



- ------------------
Name:



- ------------------
Name:



- ------------------
Name:



- ------------------
Name:



- ------------------
Name:



- ------------------
Name:





<PAGE>   1
                                                                   Exhibit 2.5


          THIS TAX ESCROW AGREEMENT (the "Escrow Agreement") dated as of January
5, 2000, is made by and among AppliedTheory Corporation, a Delaware corporation
("Parent"), AppliedTheory Reef Acquisition Corp., a Delaware Corporation (the
"Merger Sub"), United States Trust Company of New York (the "Escrow Agent"), and
CRL Network Services, Inc. ("CRL") for the benefit of those parties who are
holders of capital stock of CRL on the date hereof (collectively the
"Stockholders" and individually a "Stockholder"), as contemplated by that
certain Agreement and Plan of Merger, dated as of December 3, 1999, by and among
Parent, the Merger Sub, CRL and James G. Couch (the "Agreement and Plan of
Merger"). Capitalized terms not otherwise defined herein shall have the meanings
ascribed to them in the Agreement and Plan of Merger.

          WHEREAS, Parent, the Merger Sub, CRL and Mr. Couch have entered into
the Agreement and Plan of Merger to provide for the merger of the Company and
the Merger Sub and the corresponding transfer to the Parent of all the ownership
interests of CRL (the "Merger");

          WHEREAS, the closing of the transactions contemplated by the Agreement
and Plan of Merger is taking place as of the date hereof and the execution of
this Escrow Agreement by the parties is an express condition thereto; and

          WHEREAS, Parent has relied upon the representations, warranties and
covenants of CRL and Mr. Couch provided in the Agreement and Plan of Merger and
in the Schedules, Exhibits and other instruments or agreements delivered to and
in favor of Parent pursuant to the Agreement and Plan of Merger.

          NOW, THEREFORE, to induce Parent to proceed with the Closing and the
Merger, and in further consideration of the mutual covenants and agreements
contained herein and in the Agreement and Plan of Merger, and intending to be
legally bound, the parties hereto do hereby agree as follows:

                                    ARTICLE I
                                   DEFINITION

          For purposes of this Escrow Agreement, with respect to each
Stockholder or a group of Stockholders, "Ownership Share" shall mean that
proportion of the total Company Stock outstanding as of the date hereof which is
owned by such Stockholder or number of shares such group of Stockholders, as the
case may be. Attached hereto as Schedule A is a list identifying the Ownership
Share for each Stockholder and any group of Stockholders who hold their Company
Stock together, expressed as a percentage.

                                   ARTICLE II
                                   ESCROW FUND

          SECTION 2.1. Contemporaneous with the execution of this Escrow
Agreement, Parent shall deposit at Closing 19,882.35 shares of Parent Common
Stock

<PAGE>   2


and $97,882.35 with the Escrow Agent, such deposit to constitute an escrow fund
(the "Escrow Fund") to be governed by the terms set forth herein.

          SECTION 2.2. The Escrow Agent shall hold, safeguard and dispose of the
Escrow Fund in accordance with the terms hereof and shall treat such Escrow Fund
as an escrow fund in accordance with the terms hereof.

          SECTION 2.3. For purposes of this Escrow Agreement, the per share
value of the Stock Consideration shall be $16.00, the same per share value as
such Stock Consideration has pursuant to the Agreement and Plan of Merger.

                                  ARTICLE III
                      ESCROW PERIOD; NOTICE OF TERMINATION

          The shares of Parent Common Stock and cash deposited in the Escrow
Fund shall remain in the Escrow Fund for the period beginning on the date hereof
and ending five days following the later to occur of (a) the day upon which
Parent or the Merger Sub (the "Receiving Party"), as the case may be, shall
receive from the United States Internal Revenue Service any tax refund (the
"1997 Refund") to which Parent or the Merger Sub shall be entitled in respect of
taxes previously paid by or for CRL for the fiscal year ending December 31,
1997, or (b) the day upon which it shall have been finally determined that
neither CRL, nor the Merger Sub, nor Parent are entitled to a 1997 Refund (such
period being the "Escrow Period"). Prior to the termination of the Escrow Period
pursuant to this Article III, either Parent or the Merger Sub shall notify CRL
and its counsel in writing of the facts giving rise to the termination of the
Escrow Period, of the amount of any 1997 Refund received and of the date upon
which the Escrow Period shall terminate pursuant to this Article III, such
notice to be provided as further described in Article XIV of this Escrow
Agreement.

                                   ARTICLE IV
                DISTRIBUTION IF 1997 REFUND IN EXCESS OF $416,000

          In the event that the Receiving Party shall receive a 1997 Refund in
an amount equal to or less than $416,000, the Receiving Party shall be entitled
to payment from the Escrow Fund of a pro rata portion of the Stock Consideration
and Cash Consideration equal to the difference between $416,000 and the amount
of the 1997 Refund and the Stockholders shall collectively be entitled to
payment of the balance of the Escrow Fund. In the event that it shall have been
finally determined that neither CRL, nor the Merger Sub, nor Parent are entitled
to a 1997 Refund, at the termination of the Escrow Period the Parent or, at the
Parent's option, the Merger Sub, shall be entitled to payment of all Parent
Common Stock and cash in the Escrow Fund.

                                    ARTICLE V
                           EXPIRATION OF ESCROW PERIOD
                                       and
                           PAYMENT OF THE ESCROW FUND

          Upon the expiration of the Escrow Period, if the Stockholders shall be
entitled to a payment pursuant to Article IV hereof, the Escrow Agent shall
deliver to


                                       2
<PAGE>   3

each Stockholder his Ownership Share of the Stock Consideration and the Cash
Consideration in the Escrow Fund; provided, that such Stockholder shall have
delivered his or her shares of Company Stock to Parent or the Merger Sub on or
before the expiration of the Escrow Period. In the event that upon the
expiration of the Escrow Period one or more Stockholders shall have failed to
deliver his or her certificates representing shares of Company Stock
(collectively the "Non-Delivering Stockholders" and individually a
"Non-Delivering Stockholder"), at that time the Escrow Agent shall deliver the
Non-Delivering Stockholders' Ownership Share of the Escrow Fund to Parent;
provided, that following the Expiration of the Escrow Period, Parent and the
Merger Sub hereby agree to deliver to any Non-Delivering Stockholder a payment
of Stock Consideration and Cash Consideration corresponding to his or her
Ownership Share of the Stock Consideration and the Cash Consideration in the
Escrow Fund, such payment to be made as described in that certain letter
agreement, dated as of the date hereof, between Parent and CRL.

                                   ARTICLE VI
                           DISTRIBUTION OF ESCROW FUND

          In the event that the 1997 Refund shall be any amount greater than
$416,000, upon the Expiration of the Escrow Period the Stockholders shall
collectively be entitled to receive Merger Consideration from Parent and the
Merger Sub having a value equal to the amount by which the 1997 Refund exceeds
$416,000; provided, that 23.52941% of such Merger Consideration shall take the
form of Cash Consideration and 76.47059% of such Merger Consideration shall take
the form of Stock Consideration; provided, further that the parties hereto
understand that each Stockholder shall receive his Ownership Share of the Stock
Consideration and the Cash Consideration to be paid pursuant to this Article VI;
and provided further that Parent and the Merger Sub shall not be required to pay
any Stockholder pursuant to this Article VI and upon the expiration of the
Escrow Period unless such Stockholder shall have delivered his or her shares of
Company Stock to Parent or the Merger Sub on or before the expiration of the
Escrow Period; and provided further that Parent and the Merger Sub hereby agree
to pay any Non-Delivering Stockholder his or her Ownership Share of the Stock
Consideration and the Cash Consideration due pursuant to this Article VI in
accordance with that certain letter agreement, dated as of the date hereof,
between Parent and CRL.

                                  ARTICLE VII
                   ESCROW AGENT'S RIGHTS AND RESPONSIBILITIES

          To induce the Escrow Agent to act hereunder, it is further agreed
     that:

          (a) Any recitals contained in this Escrow Agreement shall be deemed to
     be those of the principals and not those of the Escrow Agent.

          (b) The Escrow Agent shall not be under any duty to give the property
     held hereunder any greater degree of care than it gives its own similar
     property.

          (c) The Escrow Agent may engage legal counsel who may not be counsel
     for any party to the Escrow Agreement and may act upon advice of counsel in


                                       3
<PAGE>   4

     reference to any matter connected herewith and shall not be liable for any
     acts or omissions taken or suffered pursuant to the opinion of such
     counsel. The fees and expenses of such counsel shall be deemed to be a
     proper expense for which the Escrow Agent will have a lien against the
     Escrow Fund.

          (d) The Escrow Agent shall not be liable in any respect on account of
     the identity, authority or rights of the parties executing or delivering or
     purporting to execute or deliver this Escrow Agreement or any documents or
     papers deposited or called for hereunder. The Escrow Agent shall be
     protected in acting upon any notice, request, consent, certificate, order,
     affidavit, letter, telegram or other paper or document believed by it to be
     genuine and correct and to have been signed or sent by the proper person or
     persons.

          (e) The Escrow Agent shall not be liable for the outlawing of any
     rights under any statute of limitations with respect to this Escrow
     Agreement or any documents deposited with the Escrow Agent.


          (f) The Escrow Agent is hereby expressly authorized to disregard any
     and all warnings given by any of the parties hereto or by any other person,
     excepting only orders or process of courts of law, and is hereby expressly
     authorized to comply with and obey orders, judgments or decrees of any
     court. In case the Escrow Agent obeys or complies with any such order,
     judgment or decree of any court, the Escrow Agent shall not be liable to
     any of the parties hereto or to any other person by reason of such
     compliance, notwithstanding any such order, judgment or decree being
     subsequently reversed, modified, annulled, set aside, vacated or found to
     have been entered without jurisdiction.

          (g) The Escrow Agent is authorized to rely on the written instructions
     of CRL as being the acts of CRL.

          (h) The duties of the Escrow Agent shall be as expressed under this
     Escrow Agreement, and the Escrow Agent shall have no implied duties. The
     permissive right or power to take any action shall not be construed as a
     duty to take action under any circumstances, and the Escrow Agent shall not
     be liable except in the event of its gross negligence or willful
     misconduct.

          (i) The Escrow Agent shall not be called upon to advise any party as
     to its rights and obligations hereunder.

          (j) In consideration of its acceptance of the appointment as the
     Escrow Agent, and except with respect to the Escrow Agent's own gross
     negligence or willful misconduct or acts or omissions by the Escrow Agent
     not in good faith, the other parties hereto agree, jointly and severally,
     to indemnify and hold the Escrow Agent harmless as to any loss or liability
     incurred by it to any person, firm or corporation by reason of its having
     accepted the same or in carrying out any of the terms hereof, and to
     reimburse the Escrow Agent for all its expenses, including attorney's fees,
     incurred by reason of its position hereunder or actions taken pursuant
     hereto. The Escrow Agent shall have no liability under, or duty to inquire
     into, the terms and provisions of this Escrow Agreement, and it is agreed
     that its duties are purely ministerial in nature and that the Escrow Agent
     shall


                                       4
<PAGE>   5

     incur no liability whatsoever except for willful misconduct or gross
     negligence so long as it has acted in good faith. This paragraph (j) shall
     survive the termination of the Escrow Agreement.

          (k) The Escrow Agent may execute any of the duties under this Escrow
     Agreement by or through agents or receivers.

          (l) Unless specifically required by this Escrow Agreement, the Escrow
     Agent shall not be required to give any bond or surety or report to any
     court despite any statute, custom or rule to the contrary.

          (m) In the event the Escrow Agent becomes involved in litigation by
     reason hereof, it is hereby authorized to deposit with the clerk of the
     court in which the litigation is pending any and all funds, securities or
     other property held by it pursuant hereto, less its fees, expenses and
     advances, and thereupon shall stand fully relieved and discharged of any
     further duties hereunder. Also, in the event the Escrow Agent is threatened
     with litigation by reason hereof, it is hereby authorized to implead all
     interested parties in any court of competent jurisdiction and to deposit
     with the clerk of such court any such funds, securities or other property
     held by it pursuant hereto, less its fees, expenses and advances, and
     thereupon shall stand fully relieved and discharged of any further duties
     hereunder.

          (n) The Escrow Agent shall not be obligated to risk its own funds in
     the administration of the Escrow Fund and shall have a lien against any
     funds, securities or other property in its possession or control for its
     fees, expenses and advancements. The Escrow Agent need not take any action
     under this Escrow Agreement which may involve it in any expense or
     liability until indemnified to its satisfaction for any expense or
     liability it reasonably believes may occur.

                                  ARTICLE VIII
                    UNDERTAKINGS OF PARENT AND THE MERGER SUB

          The Parent and the Merger Sub hereby undertake and agree with CRL that
following the closing of the Merger, they will use their best reasonable efforts
to promptly prepare and file an application with the United States Internal
Revenue Service seeking any 1997 Refund to which they are entitled; provided,
that CRL hereby understands and acknowledges that the application for any 1997
Refund shall be made in conjunction with the filing by the Parent and the Merger
Sub of the tax returns for such entities for the fiscal year ending December 31,
1999 (the "1999 Returns") and that the Parent and the Merger Sub shall have no
obligation to file any separate forms, documents or applications seeking any
1997 Refund prior to the filing by the Parent and the Merger of the 1999
Returns.

                                   ARTICLE IX
                                     RECORDS

          The Escrow Agent shall maintain a record of all its activities as
Escrow Agent and a record of all payments from the Escrow Fund to Parent,
the Merger Sub, the Stockholders or any other party.


                                       5
<PAGE>   6

                                    ARTICLE X
                           RESIGNATION OF ESCROW AGENT

          The Escrow Agent, or any successor, may resign as Escrow Agent
hereunder by giving 30 days' written notice thereof to CRL and Parent by
registered or certified mail. Such resignation shall become effective following
such written notice upon the earlier of the appointment by Parent and CRL of a
successor escrow agent that accepts the appointment and agrees to be bound by
the provisions of an agreement substantially similar to this Escrow Agreement or
the expiration of 30 days thereafter. Upon the effectiveness of such
resignation, all duties hereunder of the Escrow Agent so resigning shall cease,
other than the duty to account in accordance with Article VIII. CRL and Parent
shall have the right to terminate the appointment of the Escrow Agent hereunder
by giving written notice thereof to the Escrow Agent, specifying the date upon
which such termination shall take effect. A condition precedent to such
termination shall be the designation of a successor escrow agent, selected by
Parent and CRL, that has accepted the appointment and agreed to be bound by the
provisions of an escrow agreement substantially similar to this Escrow
Agreement. In event of such termination, the Escrow Agent shall turn over and
deliver to such successor escrow agent the Escrow Fund, and any other sums and
the records and instruments held by it under this Escrow Agreement and render
the accounting required by Article VIII. Notwithstanding the appointment of a
successor escrow agent, the provisions of Article XVI shall govern with respect
to Parent's liability for any fees incurred with respect to the administration
of the Escrow Fund or charged by any escrow agent.

                                   ARTICLE XI
                                     VOTING

          During the term of this Escrow Agreement, each Stockholder shall be
deemed the owner of and shall have voting power over that portion of the Parent
Common Stock that is held in the Escrow Fund and corresponds to that percentage
of all shares of Parent Common Stock outstanding as of the date hereof that is
held by such Stockholder on the date hereof.

                                  ARTICLE XII
                         DIVIDENDS AND DISTRIBUTIONS ON
                               STOCK CONSIDERATION

          During the term of this Escrow Agreement, any dividends or other
distributions on the Parent Common Stock that are made in the form of cash or
any other form of property, except for ownership rights in the Company or any
subsidiary thereof, shall be distributed to the Stockholders, pro rata in
accordance with that percentage of all shares of Parent Common Stock outstanding
as of the date hereof that is held by such Stockholder on the date hereof.
During the term of this Escrow Agreement, any dividends or other distributions
on the Parent Common Stock that are made in the form of capital stock or any
other form of ownership interest in the Company or any of its subsidiaries shall
remain in the Escrow Fund until the end of the term of this Escrow Agreement.


                                       6
<PAGE>   7

                                  ARTICLE XIII
                          INCOME ON CASH CONSIDERATION
                                       AND
                              FEES OF ESCROW AGENT

          During the term of this Escrow Agreement, any interest or other income
earned on the Cash Consideration in the Escrow Fund shall remain in the Escrow
Fund until the expiration of the Escrow Period. Upon the expiration of the
Escrow Fund, any interest or other income so earned shall be added to the Cash
Consideration and distributed in accordance with Article V hereof.

                                  ARTICLE XIV
                                     NOTICES

          All notices and other communications pursuant to this Escrow Agreement
shall be in writing and shall be deemed given if delivered personally, sent by a
nationally recognized overnight courier, or mailed by registered or certified
mail (return receipt requested), postage prepaid, or sent by facsimile (followed
with a copy sent by courier or registered or certified mail return receipt
requested) to the parties at the following addresses (or at such other address
for a party as shall be specified by notice hereunder):

                         To Parent:     AppliedTheory Corporation
                                        125 Elwood Davis Road
                                        Syracuse, NY 13212
                                        Fax:  (315) 453-3052

                   with a copy to:      Dewey Ballantine LLP

                                        1301 Avenue of the Americas
                                        New York, NY 10019-6092
                                        Attention: Frank E. Morgan, II, Esq.
                                        Fax:  (212) 259-6333

                           To CRL:      James G. Couch
                                        Box 8343
                                        Incline Village, NV 89452
                                        Fax:  (775) 831-0501

                   with a copy to:      Sheppard, Mullin, Richter & Hampton LLP
                                        Four Embarcadero Center
                                        17th Floor
                                        San Francisco, CA 94111-4106
                                        Attn:  A. John Murphy
                                        Fax:  (415) 434-3947


                                       7
<PAGE>   8

              To the Escrow Agent:      United States Trust Company of New York
                                        114 West 47th Street
                                        New York, NY 10036-1532
                                        Attn:  Chris Collins
                                        Fax: (212) 852-1626


All such notices and other communications shall be deemed to have been received
(a) in the case of personal delivery, on the date of such delivery, (b) in the
case of delivery by nationally recognized overnight courier, on the business day
following dispatch, (c) in the case of mailing, on the third business day
following such mailing, and (d) in the case of a facsimile, when the party
receiving such facsimile shall have confirmed receipt of the communication (or
when the copy sent by courier or registered or certified mail shall have been
deemed to have been received pursuant to clause (a), (b) or (c)).

                                   ARTICLE XV
                             SUCCESSORS AND ASSIGNS

          This Escrow Agreement shall inure to the benefit of and be binding
upon the successors and assigns of the parties hereto.

                                   ARTICLE XV
                                  GOVERNING LAW

          This Escrow Agreement shall be governed by and interpreted in
accordance with the laws of the State of New York without regard to the choice
of law principles thereof.

                                   ARTICLE XVI
                                   ESCROW FEES

          James G. Couch and the Merger Sub shall each be responsible for one
half of any administration or other fees charged by the Escrow Agent and any
successor escrow agent in connection with the performance of this Escrow
Agreement.

                                  ARTICLE XVII
                                    EXPENSES

          In the event of any dispute that results in a suit or other legal
proceeding to construe or enforce any provision of this Escrow Agreement or
because of an alleged breach, default or misrepresentation in connection with
any of the provisions of this Escrow Agreement, the parties agree that each
party shall be responsible for its own attorneys' fees and other costs incurred
in any action or proceeding.

                                  ARTICLE XVIII
                                  COUNTERPARTS

          This Escrow Agreement may be executed in any number of counterparts,
each of which when so executed shall constitute an original hereof, but all of
which together shall constitute one agreement.


                                       8
<PAGE>   9

          IN WITNESS WHEREOF, the undersigned have executed this Escrow
Agreement to be effective as of the day and year first above written.


                                       APPLIEDTHEORY REEF ACQUISITION CORP.:


                                       By:
                                          --------------------------------------
                                          Name: Danny E. Stroud
                                          Title: Vice President - Corporate
                                                 Development and Western
                                                 Operations


                                       APPLIEDTHEORY CORPORATION:


                                       By:
                                          --------------------------------------
                                          Name: Danny E. Stroud
                                          Title: Vice President - Corporate
                                                 Development and Western
                                                 Operations


                                       CRL NETWORK SERVICES, INC.


                                       By:
                                          --------------------------------------
                                             Name:
                                                  ------------------------------
                                             Title:
                                                   -----------------------------


                                       UNITED STATES TRUST COMPANY OF NEW YORK


                                       By:
                                          --------------------------------------
                                             Name:
                                                  ------------------------------
                                             Title:
                                                   -----------------------------






<PAGE>   1
                                                                    Exhibit 99.2

PRESS RELEASES

For Immediate Release

- -------------------------------------------------------------------------------

APPLIEDTHEORY COMPLETES ACQUISITION OF CRL NETWORK SERVICES, INC.

NEW YORK, NY JANUARY 06, 2000 - AppliedTheory Corporation (Nasdaq: ATHY), the
leading provider of integrated Internet business solutions, announced today that
it has acquired privately-held CRL Network Services, Inc., a San Francisco-based
ISP with a national Tier 1 Internet backbone.

"We enter 2000 with a stronger presence on the west coast, both in terms of
customer support and sales force presence and have enhanced our capabilities to
provide fast, reliable support nationwide," said Dr. Richard Mandelbaum,
AppliedTheory Chairman and CEO.

"CRL complements our hosting facility in Hayward, California, as well as the
relationship AppliedTheory enjoys with Broadwing, Inc., a new company formed
after the recent merger of Cincinnati Bell and IXC Communications, for the
Gemini2000 Next Generation Internet network. In addition, we see strong
opportunities to sell our company's full suite of services to CRL's client
base."

AppliedTheory is focused on building a national organization to provide an
integrated suite of Internet business solutions. The company plans to keep
growth in step with the greater demand for more sophisticated Internet services
and applications from its rapidly expanding client base, comprised mainly of
mid-sized companies, government agencies and universities. Presently,
AppliedTheory provides its customers with professional Internet consulting
services, custom application development, high-speed access, hosting and
security services, and a high level of customer support.

By acquiring CRL, AppliedTheory immediately enhances its network Infrastucture
by linking the company's data centers on the east and west coasts. This will
allow the company to compete aggressively across the entire range of its product
and service offerings. With regard to the Web hosting services, for instance,
AppliedTheory customers will see immediate benefit through improved peering
arrangements that will increase responsiveness and performance of content hosted
on AppliedTheory servers.

"AppliedTheory's acquisition of CRL has gone quickly and smoothly, with full
cooperation and no integration issues," added Dr. Mandelbaum. "This means we
will be able to launch a national sales efforts and expand our services into the
West coast ahead of schedule."

ABOUT APPLIEDTHEORY
With deep roots in the emerging Internet marketplace, AppliedTheory offers a
peerless strategic vision to companies and public sector organizations seeking
everything from simple Internet access to sophisticated large-scale,
Internet-based application development. AppliedTheory's integrated solutions are
tailored not only to the customer's immediate needs, but are engineered to
respond to future
<PAGE>   2
demand, with an emphasis on customer support and service. Together with its
strategic business partners, AppliedTheory implements a broad range of
best-of-breed services nationwide, including needs assessment and security
consulting, dedicated web hosting and access, Virtual Private Network (VPN)
implementation, enterprise portal development, database integration and
administration, and ongoing end-to-end support. More than a technology company,
AppliedTheory understands the Internet business-and how to do business on the
Internet. AppliedTheory is headquartered in Great Neck, New York. For more
information, access the company's Web site at www.appliedtheory.com.

Statements contained in this press release that are not historical facts may be
deemed to be forward-looking statements, which are subject to risks and
uncertainties, including those discussed in AppliedTheory's filings with the
Securities and Exchange Commission.
- -------------------------------------------------------------------------------


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