Document:

<PAGE>   1

                                                                     EXHIBIT 4.2

                              AMENDED AND RESTATED

                          REGISTRATION RIGHTS AGREEMENT

                                      among

                COMMERCIAL ELECTRONICS CAPITAL PARTNERSHIP, L.P.,

                         COMMERCIAL ELECTRONICS, L.L.C.,

                        THE NEW PURCHASERS LISTED HEREIN

                                       and

                              E-SYNC NETWORKS, INC.

                             -----------------------
                                November 1, 1999
                             -----------------------

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                                Table of Contents

<TABLE>
<C>      <S>                                                                                           <C>
1.       Registration on Request...................................................................... -1-
2.       Incidental Registration...................................................................... -3-
3.       Registration Procedures...................................................................... -4-
4.       Underwritten Offerings....................................................................... -6-
5.       Preparation; Reasonable Investigation........................................................ -7-
6.       Rights of Requesting Holders................................................................. -7-
7.       Registration Expenses........................................................................ -8-
8.       Indemnification and Contribution............................................................. -8-
9.       Registration Rights to Others................................................................-10-
10.      Nominees for Beneficial Owners...............................................................-10-
11.      Rule 144.....................................................................................-10-
12.      Additional New Purchasers; Addition of the Merging Purchasers................................-10-
13.      Definitions..................................................................................-10-
14.      Miscellaneous................................................................................-12-

</TABLE>

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               AMENDED AND RESTATED REGISTRATION RIGHTS AGREEMENT

     AMENDED AND RESTATED REGISTRATION RIGHTS AGREEMENT (this "Agreement"),
dated as of November 1, 1999, by and among COMMERCIAL ELECTRONICS CAPITAL
PARTNERSHIP, L.P., a Delaware limited partnership, COMMERCIAL ELECTRONICS,
L.L.C., a Delaware limited liability company, (collectively, the "Original
Purchasers"), the parties listed on Schedule I hereto and the parties added to
such Schedule subsequent to the date hereof pursuant to Section 12 below
(collectively, the "New Purchasers"), and the parties identified as Merging
Purchasers in Section 12 below and added subsequent to the date hereof pursuant
to such Section (the "Merging Purchasers" and together with the Original
Purchasers and the New Purchasers, the "Purchasers") and E-SYNC NETWORKS, INC.,
a Delaware Corporation (as successor to Wiltek, Inc., a Connecticut corporation)
(the "Company"). Capitalized terms used herein and not otherwise defined shall
have the respective meanings given them in Section 13.

     WHEREAS the Company and the Original Purchasers are parties to a
Registration Rights Agreement dated as of January 28, 1999 (the "Original
Agreement"); and

     WHEREAS the Company and certain of the New Purchasers are parties to a
Subscription Agreement, dated as of the date hereof (the "Purchase Agreement"),
certain of the New Purchasers' obligations under which are conditioned upon the
execution and delivery of this Agreement; and

     WHEREAS, the Company and the holders of the preference shares of E-Sync
Networks (UK) Ltd., an entity formed under the laws of England, and a wholly
owned subsidiary of the Company, are parties to an Exchange Agreement (the
"Exchange Agreement"), pursuant to which such preference shares may be exchanged
for the Company's Series B Senior Convertible Preferred Stock; and

     WHEREAS, pursuant to the terms of the Exchange Agreement, upon the exchange
of shares contemplated therein, such shareholders are to be added to this
Agreement as New Purchasers; and

     WHEREAS, the Company is party to an Agreement and Plan of Merger, dated as
of September 27, 1999 (the "Merger Agreement"), pursuant to which certain
parties will be acquiring capital stock of the Company and the closing of which
is conditioned upon, among other things, such parties becoming parties to this
Agreement; and

     WHEREAS the Company and the Original Purchasers desire to amend and restate
the Original Agreement in the form of this Agreement to include the New
Purchasers and the Merging Purchasers as parties in accordance with the terms
herein, among other things;

     NOW, THEREFORE, in consideration of the mutual covenants and agreements
herein contained, the parties hereto agree as follows:

     1.   Registration on Request.

          (1) Request. Except as otherwise provided in this Section 1, at any
     time and from time to time, upon the written request of (x) one or more
     Initiating Holders or (y) one or more Merging Purchaser Initiating Holders
     requesting that the Company effect a registration under the Securities Act
     of all or any part of such Initiating Holders' or Merging Purchaser
     Initiating Holders' Registrable Securities, and specifying the intended
     method or methods of disposition thereof, the Company will promptly, but in
     any event within ten (10) days after receipt of such written request, give
     written notice of such requested registration to all holders of Registrable
     Securities, and thereupon will use its best efforts to effect, as
     reasonably expeditiously as practicable, the registration under the
     Securities Act, including by means of a shelf registration pursuant to Rule
     415 under the Securities Act if so requested in such request (but in the
     case of a shelf registration only if the Company is then eligible to use
     Form S-2 or S-3 (or any successor forms) for such a

<PAGE>   4

     shelf registration), of:

               (i) the Registrable Securities which the Company has been so
          requested to register by such Initiating Holders or Merging Purchaser
          Initiating Holders, for disposition in accordance with the intended
          method or methods of disposition stated in such request,

               (ii) all other Registrable Securities which the Company has been
          requested to register by the holders thereof by written request
          delivered to the Company within thirty (30) days after the giving of
          such written notice by the Company (which request shall specify the
          intended method or methods of disposition thereof), and

               (iii) all other securities which the Company wishes to register,
          whether for its own account or for the account of the holders thereof,

     all to the extent necessary to permit the disposition (in accordance with
     the intended methods thereof as aforesaid) of the Registrable Securities so
     to be registered; provided that any holder of Registrable Securities to be
     included in any such registration, by written notice to the Company within
     ten (10) days after its receipt of a copy of a notice from the managing
     underwriter delivered pursuant to Section 1(e), may withdraw such request
     and, upon receipt of such notice of the withdrawal of such request from
     holders comprising the Requisite Holders, the Company may elect not to
     effect such registration.

          (2) Number of Registrations. The Company shall not be required to
     effect more than three (3) registrations pursuant to this Section 1 on
     behalf of Initiating Holders and more than one (1) registration pursuant to
     this Section 1 on behalf of Merging Purchaser Initiating Holders.

          (3) Registration Statement Form. Registrations under this Section 1
     shall be on such appropriate registration form of the Commission (i) as
     shall be requested by the Requisite Holders (provided that the Company is
     then eligible to use such form) and (ii) as shall permit the disposition of
     such Registrable Securities in accordance with the intended method or
     methods of disposition specified in the request for their registration.

          (4) Effective Registration Statement. A registration requested
     pursuant to this Section 1 shall not be deemed to have been effected (i)
     unless a registration statement with respect thereto has become effective,
     (ii) if the registration does not remain effective for a period of at least
     ninety (90) days (or, with respect to any registration statement filed
     pursuant to Rule 415 under the Securities Act, for a period of at least one
     (1) year) or, in either case if earlier, until all the Registrable
     Securities requested to be registered in connection therewith were sold or
     withdrawn by the participating Holders, (iii) if, after it has become
     effective, such registration is subject to any stop order, injunction or
     other order or requirement of the Commission or other governmental agency
     or court for any reason not attributable to actions taken by the holders of
     Registrable Securities), or (iv) if the conditions to closing specified in
     the purchase agreement or underwriting agreement entered into in connection
     with such registration are not satisfied and no such closing occurs, other
     than by reason of some act or omission by the holders of the Registrable
     Securities that were to have been registered.

          (5) Registration of Other Securities. Whenever the Company shall
     effect a registration pursuant to this Section 1, no securities other than
     Registrable Securities shall be included among the securities covered by
     such registration unless holders of Registrable Securities requesting
     registration thereof pursuant to Section 1, representing not less than 50%
     of the Registrable Securities with respect to which registration has been
     requested, shall have consented in writing to the inclusion of such other
     securities.

          (6) Postponement. The Company shall be entitled to postpone for a
     reasonable period of time (but not exceeding sixty (60) days) the filing of
     any registration statement otherwise required to be prepared and filed by
     it pursuant to this Section 1 if the Company determines, in its reasonable
     judgment, that such registration and offering would interfere with any
     material financing, acquisition, corporate reorganization or other material
     transaction involving the Company or any of its Affiliates and promptly
     gives the holders of Registrable Securities requesting registration thereof
     pursuant to this Section 1 written notice

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     of such determination, containing a general statement of the reasons for
     such postponement and an approximation of the anticipated delay. The
     Company may not postpone a filing pursuant to this Section 1(f) more than
     once in any twelve-month period. If the Company shall so postpone the
     filing of a registration statement, holders of Registrable Securities
     requesting registration thereof pursuant to Section 1, representing not
     less than 15% of the Registrable Securities with respect to which
     registration has been requested and constituting not less than 50% of the
     Initiating Holders, shall have the right to withdraw the request for
     registration by giving written notice to the Company within thirty (30)
     days after receipt of the notice of postponement and, in the event of such
     withdrawal, such request shall not be counted for purposes of the requests
     for registration to which holders of Registrable Securities are entitled
     pursuant to Section 1.

          (7) Limitations on Registration on Request. Notwithstanding anything
     in this Section 1 to the contrary, the Company shall not be required to
     effect a registration pursuant to this Section 1 (i) prior to the first
     anniversary of the date hereof or (ii) within the 12-month period occurring
     immediately subsequent to the effectiveness (within the meaning of Section
     1(d) hereof) of a registration statement filed pursuant to this Section 1;
     provided, however, that the limitation set forth in clause (i) of this
     sentence shall not apply to the holders of the Company's Series A Senior
     Convertible Preferred Stock as Initiating Holders on or following January
     28, 2000; provided further, however, that the limitation set forth in
     clause (i) of this sentence shall not apply to Merging Purchaser Initiating
     Holders on or following the six month anniversary of the date hereof
     requesting a registration of no more than 50% of all Merging Purchaser
     Registrable Securities then outstanding.

     2.   Incidental Registration.

          (1) Incidental Rights. If the Company at any time proposes to
     register, on any form which may be used for the registration of Registrable
     Securities other than Form S-4 or Form S-8 (or any successor or similar
     forms then in effect), any of its securities under the Securities Act
     (other than pursuant to Section 1), whether or not pursuant to registration
     rights granted to other holders of its securities and whether or not for
     sale for its own account, in a manner which would permit registration of
     Registrable Securities for sale to the public under the Securities Act, it
     will each such time give written notice to all holders of Registrable
     Securities of its intention to do so and of such holders' rights under this
     Section 2; such notice to be given to all such holders at least twenty (20)
     days prior to the filing of such proposed registration statement. Upon the
     written request of any such holder (a "Requesting Holder") made within
     fifteen (15) days after the giving of any such notice (which request shall
     specify the Registrable Securities intended to be disposed of by such
     holder and the intended method or methods of disposition thereof), the
     Company will use its best efforts to effect the registration under the
     Securities Act of all Registrable Securities which the Company has been so
     requested to register by the Requesting Holders, to the extent necessary to
     permit the disposition (in accordance with the intended methods thereof as
     aforesaid) of the Registrable Securities so to be registered. With respect
     to an underwritten offering, prior to the effective date of any
     registration statement filed in connection with a registration described in
     this Section 2, promptly upon notification to the Company from the managing
     underwriter of the price at which the Registrable Securities requested to
     be registered pursuant to this Section 2 are to be sold, the Company shall
     advise each Requesting Holder of such price, and if such price is below the
     price which any Requesting Holder shall have indicated to be acceptable to
     such Requesting Holder, such Requesting Holder shall then have the right to
     withdraw its request to have its Registrable Securities included in such
     registration statement. Notwithstanding anything stated in this Section to
     the contrary, no holder of Merging Purchaser Registrable Securities may
     include such securities in any registration made at the request of a
     Merging Purchaser Initiating Holder prior to the first anniversary of the
     date hereof if such inclusion would result in the registration of more than
     50% of the Merging Purchaser Registrable Securities.

          (2) Not Deemed a Demand Registration. No registration effected
     pursuant to this Section 2 shall be deemed to have been effected pursuant
     to Section 1.

          (3) Holdback. If the Company previously shall have received a request
     for registration pursuant to Section 1 or this Section 2, and if such
     previous registration shall not have been withdrawn or abandoned, the
     Company will not effect any registration of any of its securities under the
     Securities Act, whether or not for sale for its own account, until a period
     of ninety (90) days shall have elapsed from the effective date of such
     previous registration.

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          (4) Discontinuance. Notwithstanding anything to the contrary in this
     Section 2, the Company shall have the right to discontinue any registration
     under this Section 2 at any time prior to the effective date of such
     registration, if the registration of other securities giving rise to such
     registration under this Section 2 is discontinued; but no such
     discontinuation shall preclude an immediate or subsequent request for
     registration pursuant to Section 1 or 2.

     3.   Registration Procedures. If and whenever the Company is required to
use its best efforts to effect the registration of any Registrable Securities
under the Securities Act as provided in Section 1 or Section 2, the Company will
promptly:

          (1) prepare and (in any event within ninety (90) days after the end of
     the period within which requests for registration may be given to the
     Company) file with the Commission the requisite registration statement to
     effect such registration and thereafter use its best reasonable efforts
     promptly to cause such registration statement to become effective; provided
     that the Company may discontinue any registration of its securities which
     are not Registrable Securities at any time prior to the effective date of
     the registration statement relating thereto;

          (2) prepare and file with the Commission such amendments,
     post-effective amendments and supplements to such registration statement
     and the prospectus used in connection therewith as may be necessary to keep
     such registration statement effective and to comply with the provisions of
     the Securities Act with respect to the disposition of all Registrable
     Securities covered by such registration statement until the earlier of (i)
     such time as all of such Registrable Securities have either been disposed
     of in accordance with the intended methods of disposition by the sellers
     thereof set forth in such registration statement or the sale thereof has
     been abandoned by such sellers and (ii) ninety (90) days after the
     effective date of such registration statement, except with respect to any
     such registration statement filed pursuant to Rule 415 (or any successor
     Rule) under the Securities Act, in which case such period shall be one
     year;

          (3) furnish as soon as available to each seller of Registrable
     Securities covered by such registration statement such number of copies of
     such drafts and final versions of such registration statement and of each
     such amendment, post-effective amendment and supplement thereto (in each
     case including all exhibits), such number of copies of such drafts and
     final versions of the prospectus contained in such registration statement
     (including each preliminary prospectus and any summary prospectus), any
     other prospectus filed under Rule 424 under the Securities Act, in
     conformity with the requirements of the Securities Act, such documents, if
     any, incorporated by reference in such registration statement or
     prospectus, and such other documents, as such seller or such holder may
     reasonably request;

          (4) use its commercially reasonably efforts to register or qualify all
     Registrable Securities covered by such registration statement under such
     other securities or blue sky laws of such jurisdictions as each seller
     thereof shall reasonably request, to keep such registration or
     qualification in effect for so long as such registration statement remains
     in effect, and take any other action which may be reasonably necessary or
     advisable to enable such seller to consummate the disposition in such
     jurisdictions of the securities owned by such seller, except that the
     Company shall not for any such purpose be required to qualify generally to
     do business as a foreign corporation in any jurisdiction wherein it would
     not but for the requirements of this clause (d) be obligated to be so
     qualified or to consent to general service of process in any such
     jurisdiction;

          (5) cooperate with the sellers of such Registrable Securities to
     facilitate the timely preparation and delivery of certificates representing
     Registrable Securities to be sold, which securities shall not bear any
     restrictive legends indicating that the securities have not been registered
     under the Securities Act and shall be in a form eligible for deposit with
     The Depository Trust Company; and enable such Registrable Securities to be
     in such denominations and registered in such names as such sellers may
     request at least two (2) business days prior to any sale of Registrable
     Securities;

          (6) furnish to each seller of Registrable Securities upon request a
     copy of (i) an opinion of counsel for the Company, dated the effective date
     of such registration statement (or, if such registration involves an
     underwritten public offering, dated the date of the closing under the
     underwriting agreement), covering substantially the same matters with
     respect to such registration statement (and the

                                       -4-

<PAGE>   7

     prospectus included therein) as are customarily covered in opinions of
     issuer's counsel in underwritten public offerings of securities and (ii) a
     "comfort" letter signed by the independent public accountants who have
     certified the Company's financial statements included or incorporated by
     reference in such registration statement, covering substantially the same
     matters with respect to such registration statement (and the prospectus
     included therein) and, with respect to events subsequent to the date of
     such financial statements, as are customarily covered in accountants'
     comfort letters delivered to the underwriters in underwritten public
     offerings of securities and such other financial matters as the Requisite
     Holders or the underwriters, as the case may be, may reasonably request,
     subject to the delivery by such seller to such independent public
     accountants of such documents as are reasonable and customary in
     transactions of this nature;

          (7) promptly notify each seller of such Registrable Securities, and
     (if requested by any such seller) confirm such advice in writing, (i) when
     the prospectus or any prospectus supplement or post-effective amendment has
     been filed and, with respect to the registration statement or any
     post-effective amendment, when the same has become effective, (ii) of any
     request by the Commission for amendments or supplements to the registration
     statement or the prospectus or for additional information, (iii) of the
     issuance by the Commission of any stop order suspending the effectiveness
     of the registration statement or the initiation of any proceedings for that
     purpose and (iv) of the receipt by the Company of any notification with
     respect to the suspension of the qualification of the Registrable
     Securities for sale in any jurisdiction or the initiation or threatening of
     any proceeding for such purpose;

          (8) promptly notify each seller of Registrable Securities covered by
     such registration statement, at any time when a prospectus relating thereto
     is required to be delivered under the Securities Act, upon discovery that,
     or upon the happening of any event as a result of which, the prospectus
     included in such registration statement, as then in effect, includes an
     untrue statement of a material fact or omits to state any material fact
     required to be stated therein or necessary to make the statements therein
     not misleading in the light of the circumstances under which they were
     made, and at the request of any such seller or holder promptly prepare and
     furnish to such seller or holder a reasonable number of copies of a
     supplement to or an amendment of such prospectus as may be necessary so
     that, as thereafter delivered to the purchasers or prospective purchasers
     of such securities, such prospectus shall not include an untrue statement
     of a material fact or omit to state a material fact required to be stated
     therein or necessary to make the statements therein not misleading in the
     light of the circumstances under which they were made;

          (9) use its reasonable commercial efforts to obtain the withdrawal of
     any order suspending the effectiveness of the registration statement at the
     earliest possible time;

          (10) otherwise comply with all applicable rules and regulations of the
     Commission, and make available to its securities holders, as soon as
     reasonably practicable, an earnings statement covering the period of at
     least twelve months, but not more than eighteen (18) months, beginning with
     the first full calendar month after the effective date of such registration
     statement, which earning statement shall satisfy the provisions of Section
     11(a) of the Securities Act, and furnish to each such seller at least ten
     (10) days prior to the filing thereof a copy of any amendment or supplement
     to such registration statement or prospectus and shall not file any thereof
     to which any such seller shall have reasonably objected on the grounds that
     such amendment or supplement does not comply in all material respects with
     the requirements of the Securities Act or the rules or regulations
     thereunder;

          (11) provide and cause to be maintained a transfer agent and a
     registrar for all Registrable Securities covered by such registration
     statement from and after a date not later than the effective date of such
     registration statement;

          (12) cause all Registrable Securities covered by such registration
     statement to be listed on each securities exchange or approved for
     quotation on any inter-dealer quotation system on which similar securities
     issued by the Company are then listed or quoted;

          (13) makes its officers and employees available to participate in
     presentations to potential purchasers of Registrable Securities;

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<PAGE>   8

          (14) cause its subsidiaries and affiliates to take all action
     necessary or advisable to effect the registration of the Registrable
     Securities contemplated hereby, including preparing and filing any required
     financial information;

          (15) provide a CUSIP number for all Registrable Securities, not later
     than the effective date of the applicable registration statement; and

          (16) enter into such agreements and take such other actions as the
     Requisite Holders shall reasonably request in order to expedite or
     facilitate the disposition of such Registrable Securities.

The Company may require each holder of Registrable Securities which will be
included in such registration (i) to furnish the Company such information
relating to such holder as the Company may reasonably request and as is required
by applicable laws or regulations, and (ii) to provide the Company with written
confirmation that such holder will comply with applicable laws and regulations,
and provide the Company with such further information necessary for the Company
to abide by applicable laws and regulations, in such form as the Company may
reasonably request.

     4.   Underwritten Offerings.

          (1) Requested Underwritten Offerings. If requested by the underwriters
     for any underwritten offering of Registrable Securities pursuant to a
     registration requested under Section 1, the Company will use its
     commercially reasonable efforts to enter into a firm commitment
     underwriting agreement with such underwriters for such offering, such
     agreement to be reasonably satisfactory in substance and form to the
     underwriters and to contain such representations and warranties by the
     Company and such other terms as are generally prevailing in such
     agreements, including, without limitation, indemnities to the effect and to
     the extent provided in Section 8. The holders of Registrable Securities to
     be distributed by such underwriters shall be parties to such underwriting
     agreement and may, at their option, require that any or all of the
     representations and warranties by, and the other agreements on the part of,
     the Company to and for the benefit of such underwriters shall also be made
     to and for the benefit of such holders of Registrable Securities. Except as
     set forth in this Agreement, no holder of Registrable Securities shall be
     required (i) to make any representations or warranties to or agreements
     with the Company or the underwriters other than representations, warranties
     or agreements regarding such holder, such holder's Registrable Securities
     and such holder's intended method of distribution and any other
     representation required by law or (ii) to indemnify (or contribute with
     respect to an indemnifiable claim) the Company or any underwriters of the
     Registrable Securities, except as set forth in Section 8.

          (2) Incidental Underwritten Offerings. If the Company at any time
     proposes to register any of its securities under the Securities Act as
     contemplated by Section 2, whether or not pursuant to registration rights
     granted to other holders of its securities and whether or not for sale for
     its own account, and such securities are to be distributed by or through
     one or more underwriters, the Company will, if requested by any holder of
     Registrable Securities as provided in Section 2 and subject to the
     provisions of this Section 4(b), use its best efforts to arrange for such
     underwriters to include all the Registrable Securities to be offered and
     sold by such holder among the securities to be distributed by such
     underwriters; provided that if the managing underwriter of such
     underwritten offering shall advise the Company in writing (with a copy to
     the holders of Registrable Securities requesting such registration) that,
     in its opinion the total number of shares which the Company, the holders of
     Registrable Securities and any other holders of securities of the Company
     propose to be included in such registration is sufficiently large to
     materially and adversely affect the success of such offering (such writing
     to state the basis of such opinion and the approximate number of such
     securities which may be included in such offering without such effect),
     then after inclusion of the number of securities to be sold by the Company
     for its own account and the number of securities to be included pursuant to
     contractual demand registration rights (other than the contractual
     registration rights set forth herein) in such registration, the amount of
     securities to be offered for the accounts of holders of Registrable
     Securities shall be reduced pro rata (in accordance with the number of
     Registrable Securities requested to be included in such registration) to
     the extent necessary to reduce the total amount of securities to be
     included in such offering to the amount recommended by such managing
     underwriter; provided that if securities are being offered for the account
     of other Persons as well as the Company, such reduction shall not represent
     a greater fraction of the

                                       -6-

<PAGE>   9

     number of securities intended to be offered by holders of Registrable
     Securities than the fraction of similar reductions imposed on such other
     Persons over the amount of securities they intended to offer. Any holder of
     Registrable Securities to be included in such registration may withdraw its
     request to have its securities so included by notice to the Company
     promptly after receipt of a copy of a notice from the managing underwriter
     pursuant to this Section 4(b). The holders of Registrable Securities to be
     distributed by such underwriters shall be parties to the underwriting
     agreement between the Company and such underwriters and may, at their
     option, require that any or all of the representations and warranties by,
     and the other agreements on the part of, the Company to and for the benefit
     of such underwriters shall also be made to and for the benefit of such
     holders of Registrable Securities. Except as set forth in this Agreement,
     no holder of Registrable Securities shall be required (i) to make any
     representations or warranties to or agreements with the Company or the
     underwriters other than customary representations, warranties or agreements
     regarding such holder, such holder's Registrable Securities and such
     holder's intended method of distribution and any other representation
     required by law or (ii) to indemnify (or contribute with respect to an
     indemnifiable claim) the Company or any underwriters of the Registrable
     Securities, except as set forth in Section 8, except to the extent that the
     other holders of securities included in such registration statement (other
     than holders of Registrable Securities) have agreed to make such
     representations and warranties or to indemnify the Company in connection
     with such registration.

          (3) Holdback Agreements. Each holder of Registrable Securities agrees,
     if so required by the managing underwriter, not to effect any public sale
     or distribution of securities of the Company of the same class as the
     securities included in such registration statement, during the seven (7)
     days prior to the date on which any underwritten registration pursuant to
     Section 1 or 2 has become effective and the ninety (90) days (or such
     longer period as shall have been agreed to by all of the holders of
     securities included in such registration statement other than the holders
     of Registrable Securities) thereafter, except as part of such underwritten
     registration or to the extent that such holder is prohibited by applicable
     law from agreeing to withhold Registrable Securities from sale or is acting
     in its capacity as a fiduciary or an investment adviser. The Company agrees
     not to effect any public sale or distribution of its equity securities or
     securities convertible into or exchangeable or exercisable for any of such
     securities during the seven (7) days prior to and the ninety (90) days
     after any underwritten registration pursuant to Section 1 or 2 has become
     effective, except as part of such underwritten registration.

          (4) Selection of Underwriters. If a requested registration pursuant to
     Section 1 involves an underwritten offering, the underwriter or
     underwriters thereof shall be selected by the Company, which selection
     shall be subject to the approval of the Requisite Holders. If an incidental
     registration pursuant to Section 2 involves one or more underwriters, the
     underwriter or underwriters shall be selected by the Company.

     5. Preparation; Reasonable Investigation. In connection with the
preparation and filing of each registration statement registering Registrable
Securities under the Securities Act, the Company will give the holders of
Registrable Securities on whose behalf such Registrable Securities are to be so
registered, and their underwriters, if any, and their respective counsel the
opportunity to participate in the preparation of such registration statement,
each prospectus included therein or filed with the Commission, and each
amendment thereof or supplement thereto, and will give each of them such access
to its books and records and such opportunities to discuss the business of the
Company with its officers and the independent public accountants who have
certified its financial statements as shall be necessary, in the opinion of such
holders and such underwriters or their respective counsel, to conduct a
reasonable investigation within the meaning of the Securities Act.

     6. Rights of Requesting Holders. If any registration statement refers to
any Requesting Holder by name or otherwise as the holder of any securities of
the Company, such holder shall have the right to require (a) the insertion
therein of language, in form and substance reasonably satisfactory to such
holder, to the effect that, if true, the holding by such holder of such
securities does not necessarily make such holder a "controlling person" of the
Company within the meaning of the Securities Act or (b) in the event that such
reference to such holder by name or otherwise is not required by the Securities
Act or any rules and regulations promulgated thereunder, the deletion of the
reference to such holder.

                                       -7-

<PAGE>   10

     7. Registration Expenses. The Company will, whether or not any registration
     pursuant to this Agreement shall become effective, pay all Registration
     Expenses incident to its performance under or compliance with this
     Agreement promptly as such Registration Expenses are incurred.

     8. Indemnification and Contribution.

          (1) The Company will, and hereby does, indemnify and hold harmless, in
     the case of any registration statement filed pursuant to Section 1 or 2,
     each seller of any Registrable Securities covered by such registration
     statement and each other Person who participates as an underwriter in the
     offering or sale of such securities and each other Person, if any, who
     controls such seller or any such underwriter within the meaning of the
     Securities Act, and their respective directors, officers, partners, agents
     and Affiliates, against any losses, claims, damages or liabilities, joint
     or several, to which such seller or underwriter or any such director,
     officer, partner, agent, Affiliate or controlling person may become subject
     under the Securities Act or otherwise, including, without limitation, the
     reasonable fees and expenses of legal counsel, insofar as such losses,
     claims, damages or liabilities (or actions or proceedings, whether
     commenced or threatened, 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 securities were
     registered under the Securities Act, any preliminary prospectus, final
     prospectus or summary prospectus contained therein, or any amendment or
     supplement thereto, or any omission or alleged omission to state therein a
     material fact required to be stated therein or necessary to make the
     statements therein in light of the circumstances in which they were made
     not misleading, and the Company will reimburse such seller or underwriter
     and each such director, officer, partner, agent, Affiliate and controlling
     Person for any legal or any other expenses reasonably incurred by them in
     connection with investigating or defending any such loss, claim, liability,
     action or proceeding; provided, however, that the Company shall not be
     liable in any such case to the extent that any such loss, claim, damage,
     liability (or action or proceeding in respect thereof) or expense arises
     out of or is based upon an untrue statement or alleged untrue statement or
     omission or alleged omission made in such registration statement, any such
     preliminary prospectus, final prospectus, summary prospectus, amendment or
     supplement in reliance upon and in conformity with written information
     furnished to the Company by or on behalf of such seller or underwriter, as
     the case may be, specifically stating that it is for use in the preparation
     thereof; and provided, further, that the Company shall not be liable to any
     Person who participates as an underwriter in the offering or sale of
     Registrable Securities or any other Person, if any, who controls such
     underwriter within the meaning of the Securities Act, in any such case to
     the extent that any such loss, claim, damage, liability (or action or
     proceeding in respect thereof) or expense arises out of such Person's
     failure to send or give a copy of the final prospectus, as the same may be
     then supplemented or amended, to the Person asserting an untrue statement
     or alleged untrue statement or omission or alleged omission at or prior to
     the written confirmation of the sale of Registrable Securities to such
     Person if such statement or omission was corrected in such final prospectus
     and such final prospectus was required to be delivered to such Person. Such
     indemnity shall remain in full force and effect regardless of any
     investigation made by or on behalf of such seller or any such director,
     officer, partner, agent, Affiliate or controlling person and shall survive
     the transfer of such securities by such seller.

          (2) As a condition to including any Registrable Securities in any
     registration statement, the Company shall have received an undertaking
     satisfactory to it from the prospective seller of such Registrable
     Securities, to indemnify and hold harmless (in the same manner and to the
     same extent as set forth in Section 8(a)) the Company, and each director of
     the Company, each officer of the Company and each other Person, if any, who
     participates as an underwriter in the offering or sale of such securities
     and each other Person who controls the Company or any such underwriter
     within the meaning of the Securities Act, with respect to any statement or
     alleged statement in or omission or alleged omission from such registration
     statement, any preliminary prospectus, final prospectus or summary
     prospectus, contained therein, or any amendment or supplement thereto, if
     such statement or alleged statement or omission or alleged omission was
     made in reliance upon and in conformity with written information furnished
     to the Company by such seller specifically stating that it is for use in
     the preparation of such registration statement, preliminary prospectus,
     final prospectus, summary prospectus, amendment or supplement; provided,
     however, that the liability of such indemnifying party under this Section
     8(b) shall be limited to the amount of proceeds received by such
     indemnifying party in the offering giving rise to such liability. Such
     indemnity shall remain in full force and effect, regardless of any
     investigation made by or on behalf of the Company or any such director,
     officer or

                                       -8-

<PAGE>   11

     controlling person and shall survive the transfer of such securities by
     such seller.

          (3) Promptly after receipt by an indemnified party of notice of the
     commencement of any action or proceeding involving a claim referred to in
     Section 8(a) or (b), such indemnified party will, if a claim in respect
     thereof is to be made against an indemnifying party, give written notice to
     the latter of the commencement of such action; provided, however, that the
     failure of any indemnified party to give notice as provided herein shall
     not relieve the indemnifying party of its obligations under the preceding
     subdivisions of this Section 8, except to the extent that the indemnifying
     party is actually prejudiced by such failure to give notice. In case any
     such action is brought against an indemnified party the indemnifying party
     shall be entitled to participate in and, unless in such indemnified party's
     reasonable judgment a conflict of interest between such indemnified and
     indemnifying parties may exist in respect of such claim, to assume the
     defense thereof, jointly with any other indemnifying party similarly
     notified to the extent that it may wish, 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
     the defense thereof, the indemnifying party shall not be liable to such
     indemnified party for any legal or other expenses subsequently incurred by
     the latter in connection with the defense thereof other than reasonable
     costs of investigation. In the event a bona fide conflict of interest
     between the indemnified and indemnifying parties exists, the indemnifying
     party hereunder shall only be responsible for the payment of reasonable
     fees and expenses of a single counsel for the indemnified parties
     hereunder. No indemnifying party shall be liable for any settlement of any
     action or proceeding effected without its written consent, which consent
     shall not be unreasonably withheld. No indemnifying party shall, without
     the consent of the indemnified party, which consent shall not be
     unreasonably withheld, consent to 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 claim or litigation or which requires
     action other than the payment of money by the indemnifying party.

          (4) Contribution. If the indemnification provided for in this Section
     8 shall for any reason be held by a court to be unavailable to an
     indemnified party under Section 8(a) or (b) hereof in respect of any loss,
     claim, damage or liability, or any action in respect thereof, then, in lieu
     of the amount paid or payable under Section 8(a) or (b), the indemnified
     party and the indemnifying party under Section 8(a) or (b) shall contribute
     to the aggregate losses, claims, damages and liabilities (including legal
     or other expenses reasonably incurred in connection with investigating the
     same), (i) in such proportion as is appropriate to reflect the relative
     fault of the Company and the prospective sellers of Registrable Securities
     covered by the registration statement which resulted in such loss, claim,
     damage or liability, or action or proceeding in respect thereof, with
     respect to the statements or omissions which resulted in such loss, claim,
     damage or liability, or action or proceeding in respect thereof, as well as
     any other relevant equitable considerations or (ii) if the allocation
     provided by clause (i) above is not permitted by applicable law, in such
     proportion as shall be appropriate to reflect the relative benefits
     received by the Company and such prospective sellers from the offering of
     the securities covered by such registration statement, provided, that for
     purposes of clause (i) or (ii), the relative benefits received by the
     prospective sellers shall be deemed not to exceed the amount of proceeds
     received by such prospective sellers and no holder of Registrable
     Securities shall be required to contribute any amount in excess of the
     amount such holder would have been required to pay to an indemnified party
     if the indemnity under clause (a) of this Section 8 was available. No
     Person guilty of fraudulent misrepresentation (within the meaning of
     Section 11(f) of the Securities Act) shall be entitled to contribution from
     any Person who was not guilty of such fraudulent misrepresentation. As
     among sellers who are guilty of such fraudulent misrepresentation, such
     sellers' obligations to contribute as provided in this Section 8(d) are
     several in proportion to the relative value of their respective Registrable
     Securities covered by such registration statement and not joint. In
     addition, no Person shall be obligated to contribute hereunder any amounts
     in payment for any settlement of any action or claim effected without such
     Person's consent, which consent shall not be unreasonably withheld.

          (5) Indemnification and contribution similar to that specified in the
     preceding subdivisions of this Section 8 (with appropriate modifications)
     shall be given by the Company and each seller of Registrable Securities
     with respect to any required registration or other qualification of
     securities under any federal or state law or regulation of any governmental
     authority other than the Securities Act.

                                       -9-

<PAGE>   12

          (6) An indemnifying party shall make payments of all amounts required
     to be made pursuant to the foregoing provisions of this Section 8 to or for
     the account of the indemnified party from time to time promptly upon
     receipt of bills or invoices relating thereto or when otherwise due or
     payable; provided that the indemnified party shall reimburse the
     indemnifying party for any payments made with the stated purpose of
     satisfying the requirements of this clause (f) which were not required to
     be made by this Section 8.

     9. Registration Rights to Others. The Company hereby represents to the
holders of Registrable Securities that the rights granted herein do not conflict
with the rights, if any, granted to any other holder of securities of the
Company. If the Company shall at any time provide to any holder of any
securities of the Company rights with respect to the registration of such
securities under the Securities Act, such rights shall not be in conflict with
any of the rights provided in this Agreement to the holders of Registrable
Securities. The Company shall provide to the holders of Registrable Securities
copies of any agreements which purport to grant rights with respect to the
registration of any of the Company's securities to any holder or prospective
holder thereof promptly upon executing the same.

     10. Nominees for Beneficial Owners. For purposes of this Agreement, in the
event that any Registrable Securities are held by a nominee for the beneficial
owner thereof, the beneficial owner thereof may, at its election, be treated as
the holder of such Registrable Securities for purposes of any request or other
action by any holder or holders of Registrable Securities pursuant to this
Agreement or any determination of any number or percentage of shares of
Registrable Securities held by any holder or holders of Registrable Securities
contemplated by this Agreement. If the beneficial owner of any Registrable
Securities so elects, the Company may require assurances reasonably satisfactory
to it of such owner's beneficial ownership of such Registrable Securities.

     11. Rule 144. So long as the Company shall be required to file reports
under the Exchange Act, the Company shall take all actions reasonably necessary
to enable holders of Registrable Securities to sell such securities without
registration under the Securities Act within the limitation of the provisions of
Rule 144 under the Securities Act, as such Rule may be amended from time to
time, or any similar rule or regulation hereafter adopted by the Commission,
including, without limitation, filing on a timely basis all reports required to
be filed pursuant to the Exchange Act. Upon the request of any holder of
Registrable Securities, the Company will deliver to such holder a written
statement as to whether it has complied with such requirements.

     12. Additional New Purchasers; Addition of the Merging Purchasers. Without
the consent of any Original Purchasers or New Purchasers, at any time after the
date hereof the Company may (a) add additional New Purchasers in accordance with
the terms of the Purchase Agreement and the Exchange Agreement, provided that
such New Purchasers execute a counterpart to this Agreement and Schedule I
hereto is amended accordingly, and (b) add Dan Stechow and Kevin Marth as
Merging Purchasers in accordance with the terms of the Merger Agreement,
provided that such Merging Purchasers execute a counterpart to this Agreement.
Upon such execution, each of the additional New Purchasers and the Merging
Purchasers agree to be bound by and subject to the provisions of this Agreement
and the other Purchasers agree that such additional New Purchasers and the
Merging Purchasers shall be entitled to the rights and benefits incident hereto.

     13. Definitions. As used herein, unless the context otherwise requires, the
following terms have the following respective meanings:

     "Affiliate" means any Person controlling, controlled by or under common
control with the Person in question. As used herein, "control" means the
beneficial ownership of at least a majority of the equity interests of a Person
entitling the owner of such interests to direct the policies and operations of
such Person.

     "Commission" means the Securities and Exchange Commission and any successor
federal agency having similar powers.

                                      -10-

<PAGE>   13

     "Common Stock" means the Common Stock, no par value, of the Company,
together with any stock into which such Common Stock shall have been changed or
any stock resulting from any reclassification of such Common Stock, and all
other stock of any class or classes (however designated) of the Company the
holders of which have the right, without limitation as to amount, either to all
or to a share of the balance of current dividends and liquidating dividends
after the payment of dividends and distributions on any shares entitled to
preference, but shall not mean the Preferred Stock.

     "Company" shall have the meaning assigned such term in the introductory
paragraph of this Agreement.

     "Exchange Act" means the Securities Exchange Act of 1934, as amended, or
any successor federal statute, and the rules and regulations of the Commission
thereunder, all as the same shall be in effect at the time.

     "Initiating Holders" means, (i) for the period beginning on the date hereof
and ending on the day preceding the first anniversary of the date hereof, any
holder or holders of the Company's Series A Senior Convertible Preferred Stock
or Common Stock issued or issuable upon conversion of such shares of Preferred
Stock holding individually or in the aggregate more than 50% of such shares then
outstanding (determined on an as-if converted basis), and (ii) for the period
beginning on the first anniversary of the date hereof, any holder or holders of
Registrable Securities holding individually or in the aggregate more than 50% of
the shares of Registrable Securities then outstanding.

     "Merger Agreement" shall have the meaning assigned to such term in the
recitals of this Agreement.

     "Merging Purchasers" shall have the meaning assigned to such term in the
introductory paragraph of this Agreement.

     "Merging Purchaser Initiating Holders" means, as of any date of
determination, any holder or holders of Merging Purchaser Registrable Securities
holding individually or in the aggregate more than 50% of the shares of Merging
Purchaser Registrable Securities then outstanding.

     "Merging Purchaser Registrable Securities" means shares of Common Stock (i)
described in clause (iii) of the definition of Registrable Securities or (ii)
issued or issuable on such securities (and only on such securities) by way of a
dividend or stock split or in connection with a combination of shares,
recapitalization, merger, consolidation or other reorganization or antidilution
protection or otherwise.

     "New Purchasers" shall have the meaning assigned such term in the
introductory paragraph of this Agreement.

     "Original Purchasers" shall have the meaning assigned to such term in the
introductory paragraph of this Agreement.

     "Person" means an individual, a partnership, a limited liability company, a
joint venture, a corporation, a trust, an association, an organization, a
business, an unincorporated organization or a government or political
subdivision thereof or agency thereof or other entity of any kind.

     "Preferred Stock" means the Company's Series A Senior Convertible Preferred
Stock and Series B Senior Convertible Preferred Stock, no par value.

     "Purchase Agreement" shall have the meaning assigned to such term in the
recitals of this Agreement.

     "Purchasers" shall have the meaning assigned such term in the introductory
paragraph of this Agreement.

                                      -11-

<PAGE>   14

     "Registrable Securities" means any shares of Common Stock (i) sold to the
Original Purchasers pursuant to the Stock Purchase Agreement, (ii) issued or
issuable upon conversion of shares of Preferred Stock sold or issued to the
Original Purchasers or the New Purchasers pursuant to the Securities Purchase
Agreement, the Purchase Agreement or the Exchange Agreement, as applicable, or
upon exercise of the Warrants, (iii) issued to the Merging Purchasers pursuant
to the Merger Agreement, or (iv) issued or issuable with respect to any of the
securities referred to in clauses (i), (ii) or (iii) by way of a dividend or
stock split or in connection with a combination of shares, recapitalization,
merger, consolidation or other reorganization or antidilution protection or
otherwise. As to any particular Registrable Security, such security shall cease
to be a Registrable Security when (x) a registration statement with respect to
the sale of such security shall have become effective under the Securities Act
and the holder thereof shall have had the opportunity to dispose of such
security in accordance with such registration statement, (y) such security shall
have been sold as permitted by Rule 144 (or any successor provision) under the
Securities Act, or (z) such security, once issued, shall have ceased to be
outstanding.

     "Registration Expenses" means all expenses incident to the Company's
performance of or compliance with Sections 1 and 2, including, without
limitation, all registration and filing fees, all fees of national securities
exchanges or the National Association of Securities Dealers, Inc., all fees and
expenses of complying with securities or blue sky laws, all word processing,
duplicating and printing expenses, messenger and delivery expenses, the fees and
disbursements of counsel for the Company and of its independent public
accountants, including the expenses of "cold comfort" letters required by or
incident to such performance and compliance, any fees and disbursements of
underwriters customarily paid by issuers or sellers of securities (excluding any
underwriting discounts or commissions with respect to the Registrable
Securities, which shall not be paid by the Company) and all of the first
$10,000, and 50% of the amount in excess of $10,000, of the reasonable fees and
expenses of one counsel to the selling holders of Registrable Securities
(selected by selling holders of Registrable Securities representing a majority
of the Registrable Securities covered by such registration); provided, however,
that in the event the Company shall, in accordance with Section 2(d), not
register any securities with respect to which it had given written notice of its
intention to so register to holders of Registrable Securities, all of the costs
of the type (and subject to any limitation to the extent) set forth in this
definition and incurred by Requesting Holders in connection with such
registration shall be deemed Registration Expenses.

     "Requesting Holders" shall have the meaning assigned to such term in
Section 2 hereof.

     "Requisite Holders" means with respect to any registration of Registrable
Securities by the Company pursuant to this Agreement, any holder or holders of a
majority of the Registrable Securities requested to be registered; provided,
however, that in the case of a demand by Merging Purchaser Initiating Holders
pursuant to Section 1(a) above, "Requisite Holders" means any holder or holders
of a majority of the Merging Purchaser Registrable Securities requested to be
registered.

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

     "Securities Purchase Agreement" means the Securities Purchase Agreement
dated January 28, 1999 by and between the Company and the Original Purchasers.

     "Stock Purchase Agreement" means the Stock Purchase Agreement dated January
28, 1999 by and between the stockholders listed therein and the Company.

     "Warrants" means the Warrants issued pursuant to the Securities Purchase
Agreement to purchase up to 1,500,000 shares of Common Stock.

     14. Miscellaneous.

          (1) Remedies. Each holder of Registrable Securities, in addition to
     the rights provided herein and at law, including recovery of damages, will
     be entitled to specific performance of its rights

                                      -12-

<PAGE>   15

     under this Agreement. The Company agrees that monetary damages would not be
     adequate compensation for any loss incurred by reason of a breach by the
     Company of the provisions of this Agreement and hereby agrees to waive the
     defense in any action for specific performance that a remedy at law would
     be adequate.

          (2) Adjustments Affecting Registrable Securities. The Company will not
     take any action, or permit any change to occur, with respect to the
     Registrable Securities which would adversely affect the ability of the
     holders of Registrable Securities to include such Registrable Securities in
     a registration undertaken pursuant to the terms of this Agreement.

          (3) Amendments and Waivers. Other than the addition of parties to this
     agreement pursuant to Section 12, the provisions of this Agreement,
     including the provisions of this sentence, may not be amended, modified or
     supplemented, and waivers or consents to departures from the provisions
     hereof may not be given unless the Company has obtained the written consent
     of holders of a majority of the Registrable Securities.

          (4) Notices. All notices and other communications provided for or
     permitted hereunder shall be made in writing by hand-delivery, registered
     first-class mail, or air courier guaranteeing overnight delivery:

               (i) if to a holder of Registrable Securities, at the most current
          address given by such holder to the Company in accordance with the
          provisions of this Section 14(d); and

               (ii) if to the Company, at E-Sync Networks, Inc., 542 Westport
          Avenue, Norwalk, Connecticut 06853, Attention: President; or at such
          other address, notice of which is given in accordance with the
          provisions of this Section 14(d).

          All such notices and communications shall be deemed to have been duly
     given at the time delivered by hand, if personally delivered; five (5)
     business days after being deposited in the mail, postage prepaid, if
     mailed; and on the next business day if timely delivered to an air courier
     guaranteeing overnight delivery.

          (5) Assignment. This Agreement shall be binding upon and inure to the
     benefit of and be enforceable by the parties hereto and, with respect to
     the Company, its respective successors and permitted assigns and, with
     respect to the Purchasers, any subsequent holder of any Registrable
     Securities, subject to the provisions respecting the minimum numbers of
     percentages of shares of Registrable Securities required in order to be
     entitled to certain rights, or take certain actions, contained herein. This
     Agreement may not be assigned by the Company without the prior written
     consent of the holders of a majority of the Registrable Securities at the
     time such consent is requested. The Purchasers (and not any other holder of
     Registrable Securities or any other Person) shall be permitted, in
     connection with the transfer or disposition of Registrable Securities, to
     impose conditions or constraints on the ability of the transferee, as a
     holder of Registrable Securities, to request a registration pursuant to
     Section 1 and shall provide the Company with copies of such conditions or
     constraints and the identity of such transferees.

          (6) Calculation of Percentage Interests in Registrable Securities. For
     purposes of this Agreement, all references to a percentage of the
     Registrable Securities shall be calculated based upon the number of shares
     of Registrable Securities outstanding at the time such calculation is made,
     assuming, if applicable, the exercise, conversion or exchange of the
     Company's securities into Registrable Securities in accordance with the
     terms of such securities.

          (7) Counterparts. This Agreement may be executed in any number of
     counterparts and by the parties hereto in separate counterparts, each of
     which when so executed shall be deemed to be an original and all of which
     taken together shall constitute one and the same Agreement.

          (8) Headings. The headings in this Agreement are for convenience of
     reference only and shall not limit or otherwise affect the meaning hereof.

                                      -13-

<PAGE>   16

          (9) GOVERNING LAW. THIS AGREEMENT SHALL BE CONSTRUED AND ENFORCED IN
     ACCORDANCE WITH AND GOVERNED BY THE LAWS OF THE STATE OF NEW YORK WITHOUT
     REGARD TO CONFLICTS OF LAWS PRINCIPLES.

          (10) Severability. In the event that any one or more of the provisions
     contained herein, or the application thereof in any circumstance, is held
     invalid, illegal or unenforceable, the validity, legality and
     enforceability of any such provision in every other respect and of the
     remaining provisions contained herein shall not be affected or impaired
     thereby.

          (11) Certain Distributions. The Company shall not at any time make a
     distribution on or with respect to the Common Stock (including any such
     distribution made in connection with a consolidation or merger in which the
     Company is the resulting or surviving corporation and such Registrable
     Securities are not changed or exchanged) of securities of another issuer if
     holders of Registrable Securities are entitled to receive such securities
     in such distribution as holders of Registrable Securities and any of the
     securities so distributed are registered under the Securities Act, unless
     the securities to be distributed to the holders of Registrable Securities
     are also registered under the Securities Act.

          (12) Entire Agreement. This Agreement is intended by the parties as a
     final expression of their agreement and intended to be a complete and
     exclusive statement of the agreement and understanding of the parties
     hereto in respect of the subject matter contained herein and therein. There
     are no restrictions, promises, warranties or undertakings, other than those
     set forth or referred to herein and therein. This Agreement supersedes all
     prior agreements and understandings between the parties with respect to
     such subject matter.

                                    * * * * *

                                      -14-

<PAGE>   17

     IN WITNESS WHEREOF, each of the undersigned has executed this Registration
Rights Agreement as of the date first above written.

                                    THE COMPANY:

                                    E-SYNC NETWORKS, INC.

                                    By: /s/ Frank J. Connolly, Jr.
                                        ___________________________________
                                        Name: Frank J. Connolly, Jr.
                                        Title: Chief Financial Officer

                                    THE ORIGINAL PURCHASERS:

                                    COMMERCIAL ELECTRONICS CAPITAL
                                    PARTNERSHIP, L.P.

                                    By Electronics Investments, L.L.C.
                                    Its General Partner

                                    By: /s/ Steven D. Zucker
                                        ___________________________________
                                        Name: Steven D. Zucker
                                        Its: Member

                                    COMMERCIAL ELECTRONICS, L.L.C.

                                    By Electronics Investments, L.L.C.
                                    Its General Partner

                                    By: /s/ Steven D. Zucker
                                        ___________________________________
                                        Name: Steven D. Zucker
                                        Its: Member

                          [Signature Page to the Registration Rights Agreement]

                                       15

<PAGE>   18

                                    THE NEW PURCHASERS:

                                    _________________________________________
                                    Phillipe and C. Feront Brawerman

                                    Commercial Electronics, LLC

                                    _________________________________________
                                    Name:
                                    Title:

                                    SDJ Investments, LLC

                                    _________________________________________
                                    Name:
                                    Title:

                                    Graham Partners L.P.

                                    _________________________________________
                                    Name:
                                    Title:

                                    Allenwood Ventures, Inc.

                                    _________________________________________
                                    Name:
                                    Title:

                                    _________________________________________
                                    Jeffrey P. Williams

                                    _________________________________________
                                    John Liu

                                    _________________________________________
                                    Peter C. Krause

                                    _________________________________________
                                    Timothy M. George

                                      -16-
<PAGE>   19

                                    THE NEW PURCHASERS:

                                    _________________________________________
                                    Scott L. Bok

                                    Socatean Partners

                                    _________________________________________
                                    Name:
                                    Title:

                                    CWPI, LLC

                                    _________________________________________
                                    Name:
                                    Title:

                                    Jackson Hole Investments Acquisitions L.P.

                                    _________________________________________
                                    Name:
                                    Title:

                                    _________________________________________
                                    Michael C. Schulhof

                                    _________________________________________
                                    John C. Maxwell, III

                                    THE MERGING PURCHASERS:

                                    /s/ Dan Stechow
                                    _________________________________________
                                    Dan Stechow

                                    /s/ Kevin Marth
                                    _________________________________________
                                    Kevin Marth

                           [Signature Page to the Registration Rights Agreement]

                                      -17-<PAGE>   1

                                                                    EXHIBIT 10.1

                              EMPLOYMENT AGREEMENT

     AGREEMENT made as of the 1st day of January, 1999, by and between WILTEK,
INC., a Connecticut corporation, with its principal offices located at 542
Westport Avenue, Norwalk CT 06851 (the "Company") and David S. Teitelman, an
individual, residing at 14 Clinton Street, Fairfield, Connecticut 06430 (the
"Employee").

                              W I T N E S S E T H:

     WHEREAS, the Company desires that the Employee shall be employed by the
Company, and the Employee is desirous of such employment, upon the terms and
conditions set forth in this Agreement.

     NOW, THEREFORE, in consideration of the foregoing and the mutual covenants
and agreements contained herein, the parties hereto agree as follows:

     1. Defining Terms. As used in this Agreement, the following terms shall
have the following meanings:

          (a) "Company" shall mean and include Wiltek, Inc., and its parents,
     subsidiaries and affiliates and the respective successors and assigns of
     any of them, whether now existing or hereafter arising: provided, however,
     that references to the Company in Paragraphs 6, 7 and 9 of this Agreement
     shall be limited solely to Wiltek, Inc.

          (b) "Customer" shall mean any individual, firm, partnership,
     corporation, company, joint venture or governmental or military unit or any
     other entity or any parent, subsidiary or affiliate of any of them which is
     negotiating or has a contract with the Company for the purchase or lease of
     the Company's equipment, products or services or which has been solicited
     by the Company with respect to such purchase or lease during the Employee's
     employment with the Company.

          (c) "Confidential Information" shall mean information concerning the
     Company, its products, processes and services and its customers, suppliers,
     contractors, agents, consultants and employees (herein-after referred to as
     "Company Affiliates"), including, but not limited to, information relating
     to research, development. inventions, manufacture, purchasing, accounting,
     finances, costs, profit margins, patents, methods, programs, apparatus,
     engineering, marketing, merchandising, selling, Customer lists, Customer
     requirements and personnel, pricing, pricing methods and data processing
     and any other materials or information, heretofore or hereafter during the
     term of this Agreement, conceived, designed, created, used or developed by
     or relating to the Company or any of the Company Affiliates; provided,
     however, that Confidential Information shall not include any information
     which may be in the public domain or come into the public domain not as a
     result of a breach by the Employee of any of the terms and provisions of
     this Agreement.

          (d) "Proprietary Property" shall mean discoveries, concepts and ideas
     and expressions thereof, whether or not subject to patent, copyright,
     trademark, trade name or service mark protection, including, but not
     limited to, software, services, processes, methods, formulae, techniques,
     apparatus, designs and writings as well as improvements thereon, revisions
     thereof and know-how related thereto, concerning any present or future
     activities of the Company; provided, however, that Proprietary Property
     shall not include anything which may be in the public domain or come into
     the public domain not as a result of a breach by the Employee of any of the
     terms and provisions of this Agreement.

          (e) "Competing Product" shall mean any product, process or service of
     any person or legal entity other than the Company, in existence or under
     development, which, during the term of this Agreement, competes with or is
     an alternative to any present or future product, process, or service of the

                                       1

<PAGE>   2

     Company whether or not actively marketed by the Company.

          (f) "Competing Organization" shall mean any person or legal entity
     engaged in, about to engage in or intending to engage in research on or
     development, use, production, marketing, or selling of a Competing Product.

     2. Employment. The Company hereby employs the Employee, and the Employee
hereby accepts such employment, upon the terms and conditions set forth in this
Agreement.

     3. Duties. The Employee shall be employed by the Company as President and
he shall perform such duties and render such services consistent therewith as
may from time to time be required of him by the Board of Directors of the
Company or the Chairman of the Company.

     4. Extent of Service. During the term of his employment, the Employee
agrees that

          (a) he will serve the Company faithfully, diligently and to the best
     of his ability under the direction of the Chairman or the Board of
     Directors of the Company;

          (b) he will devote his best efforts and substantially his entire
     working time, attention and energy to the performance of his duties
     hereunder and to promoting and furthering the interests of the Company,
     taking, however, from time to time, reasonable vacations consistent with
     the performance of his obligations hereunder, and

          (c) he will not, without the prior written approval of the Board of
     Directors of the Company, which approval shall not be unreasonably
     withheld, become an officer, director, employee or consultant of, or
     otherwise become associated with or engaged in, any business other than
     that of the Company, and he will do nothing inconsistent with his duties to
     the Company.

     5. Terms of Employment. The term of employment of the Employee under this
Agreement shall be for a period commencing on the date of this Agreement and
terminating twelve (12) months thereafter, unless sooner terminated pursuant to
Paragraph 9 of this Agreement (the "Term"), and for successive one-year Terms
thereafter; provided, however, that with respect to each such successive Term,
the Company and the Employee shall have mutually agreed, in writing, to basic
compensation for such successive Term. If the Company decides not to renew the
Employee's Employment Agreement, then the Employee shall be entitled to the
termination provisions provided for in Clause 9(b) of this Employment Agreement.

     6. Basic Compensation. As basic compensation for the services to be
rendered hereunder by the Employee for the initial Term, the Company agrees to
pay to the Employee, and the Employee agrees to accept, a minimum salary at the
rate of $168,000 per annum. The salary payable to the Employee hereunder shall
be paid in equal semi-monthly installments during the Term, or in such other
manner as shall be mutually agreed upon by the parties hereto.

     7. Other Benefits. The Employee shall be entitled to participate in any
retirement, disability, profit-sharing, medical or life insurance or other
similar plan or arrangement provided by the Company to its employees, or its
other executive employees. The Employee shall also receive benefits as stated
within the attached "Schedule of Benefits."

     8. Disability. If Employee shall be disabled, he shall receive full
compensation (less any payments received from Worker's Compensation, Wiltek's
disability plans or other governmental payment for such disability) for all
periods of disability even if a period of disability extends beyond the Term;
provided, however, that the maximum number of consecutive days during which
disability occurs and for which Wiltek shall be obligated to pay such
compensation shall be one-hundred-and-eighty (180) days. Disability means the
inability of Employee to perform his duties hereunder on account of mental or
physical illness or physical incapacity.

                                       2

<PAGE>   3

     9. Termination.

          (a) The employment of the Employee hereunder shall terminate in the
     event of the death of the Employee and, at the option of the Company, upon
     written notice to the Employee, (i) in the event that Base Salary payments
     are terminated due to disability pursuant to Paragraph 8 of this Agreement,
     or (ii) in the event that the Employee shall breach any of the terms and
     provisions of this Agreement.

          (b) In addition to the provisions of Paragraph 9(a) above, the Company
     may also, in its sole discretion, elect to terminate, without cause, the
     employment of the Employee hereunder by thirty (30) days prior written
     notice to the Employee; provided, however, that if the Company shall so
     terminate this Agreement pursuant to this Paragraph 9(b), the Company shall
     pay the Employee guaranteed severance pay in accordance with the next
     sentence, continue the benefits set forth in Item 4 of the attached
     "Schedule of Benefits" for so long as the severance payments are being
     made, will continue the benefit set forth in Item 1 thereof for the terms
     thereof and will pay the bonuses set forth in Items 8 and 9 thereof per
     their respective terms. During the twelve-month period following the
     receipt of written notice by the Employee, the Company shall pay the
     Employee guaranteed severance pay at a rate equal to the Employee's base
     compensation immediately prior to such termination and such guaranteed
     severance pay shall be paid to the Employee in the manner and at the time
     or times that such base compensation would otherwise have been paid to the
     Employee. Following the twelve-month guaranteed severance pay period, if
     the Employee does not become employed, the Company shall pay the Employee
     additional supplemental severance pay in accordance with the next sentence.
     During the six-month period following the conclusion of Company payment to
     the Employee of twelve months of guaranteed severance pay, the Company
     shall pay the Employee additional supplemental severance pay at a rate
     equal to the Employee's base compensation immediately prior to such
     termination and such additional supplemental severance pay shall be paid to
     the Employee in the manner and at the time or times that such base
     compensation would otherwise have been paid to the Employee.

     10. Representations and Warranties of the Employee as to Conflicts. The
Employee hereby represents and warrants to the Company that his employment by
the Company does not and will not violate any provision of law or fiduciary duty
by which he is bound and will not conflict with or result in a breach of any
agreement or instrument to which he is a party or by which he is bound, and the
Employee agrees that he will indemnify and hold harmless the Company, its
directors, officers and employees against any claims, damages, liabilities and
expenses (including attorneys' fees) which may be incurred, including amounts
paid in settlement, by any of them in connection with any claim based upon or
related to a breach of the Employee's representation and warranty set forth in
this Paragraph. In the event of any claim based upon or related to a breach of
the Employee's representation and warranty set forth in this Paragraph 10, the
Company will give prompt notice thereof, in writing, to the Employee and the
Employee shall have the right to defend such claim with counsel reasonably
satisfactory to the Company.

     11. Proprietary Property. With respect to Proprietary Property made or
conceived by the Employee in the field of data communications, whether or not
during the hours of his employment or with the use of the Company's facilities,
materials or personnel, either individually or jointly with others during the
period of his employment by the Company, the Employee shall, without the payment
of royalty or any other considerations to him therefor:

          (a) Inform the Company promptly and fully of such Proprietary Property
     by a written report satisfactory to the Company;

          (b) Apply, at the Company's requests and expense, for United States
     and foreign letters patent, copyright, trademark or service mark, as the
     case may be, either in the Employee's name or otherwise as the Company
     shall direct;

          (c) Assign to the Company all of his right, title and interest in such
     Proprietary Property, and to applications for United States and/or foreign
     letters patent, copyright, trademark and service mark and to any letters
     patent, copyright, trademark and service mark which may be issued upon such
     Proprietary Property;

                                       3

<PAGE>   4

          (d) Deliver promptly to the Company, without charge to the Company but
     at its expense, such written instruments, and do such other acts, as may be
     necessary, in the opinion of the Company, to obtain and maintain United
     States and/or foreign letters patent, copyright, trademark or service mark
     on the Proprietary Property and to vest the entire right, title and
     interest thereto in the Company; and

          (e) Grant to the Company, prior to assignment of the Employee's right,
     title and interest to the Company in any Proprietary Property as required
     above, the royalty-free right to use in its business, and to make, have
     made, use and sell products, processes, services, writings and/or marks
     based upon or related to Proprietary Property made or conceived by the
     Employee.

     12. Confidentiality.

          (a) During the Term and at all times thereafter, the Employee will not
     use Confidential Information for his own benefit or for the benefit of any
     person or legal entity other than the Company nor will he disclose the same
     to any other person or legal entity, except as required to conduct the
     business of the Company in the ordinary course.

          (b) Except with the prior written approval of the Company or except as
     required to conduct the business of the Company in the ordinary course, the
     Employee will not, at any time, directly or indirectly, use, disseminate,
     disclose, lecture upon or publish articles concerning any Confidential
     Information.

          (c) Upon the termination of his employment with the Company, all
     documents, records, notebooks and similar repositories of or containing
     Confidential Information, including any copies thereof, then in the
     Employee's possession, or under his control, whether prepared by him or
     others, will be left with or immediately returned to the Company by the
     Employee.

     13. Non-Compete. The Employee agrees that, during the term of his
employment with the Company and also for one year following the Employee's
termination or departure from the Company he will not, without the written
approval of the Company, directly or indirectly, under any circumstances
whatsoever, own, manage, operate, engage in, control or participate in the
ownership, management, operation or control of, or be connected in any manner
with, whether as an individual, partner, stockholder, director, officer,
principal, agent, employee or consultant, or in any other relation or capacity
whatsoever, any Competing Organization, and will not in any such manner compete
with the Company or solicit or call on any Customer of the Company, wherever
located, which was a Customer of the Company at any time during the period one
(1 year prior to the termination of the Employee's employment with the Company
for the purpose of inducing such Customer to purchase or lease a Competing
Product. Notwithstanding the foregoing, nothing contained in this Paragraph 13
shall restrict the Employee from making any investment in any company whose
stock is listed on a national securities exchange or actively traded in the
over-the-counter market, so long as such investment does not give him the right
to control or influence the policy decisions of any such business or enterprise
which is or might be in competition with any business of the Company.

     14. Non-Interference. The Employee will not, for a period of one (1) year
following the termination of the Employee's employment by the Company, directly
or indirectly, employ, hire, solicit or, in any manner, encourage any employee
of the Company to leave the employ of the Company.

     15. Injunctive Relief. In addition to any other rights or remedies
available to the Company as a result of the breach of the Employee's obligations
hereunder, the Company shall be entitled to enforcement of such obligations by
an injunction or a decree of specific performance from a court with appropriate
jurisdiction and in the event that the Company is successful in any suit or
proceeding brought or instituted by the Company to enforce any of the provisions
of this Agreement or on account of any damages sustained by the Company by
reason of the violation by the Employee of any of the terms and/or provisions of
this Agreement to be performed by the Employee, the Employee agrees to pay to
the Company all attorneys' fees reasonably incurred by the Company.

     16. Withholding. The Employee hereby agrees that he will make such
arrangements as the Company may deem necessary to discharge any obligations of
the Company to withhold Federal, state or local

                                       4

<PAGE>   5

taxes imposed upon the Company in respect of this Agreement.

     17. Severability. The provisions of this Agreement shall be severable and
if any part of any provision shall be held invalid or unenforceable or any
separate covenant contained in any provision is held to be unduly restrictive
and void by a final decision of any court or other tribunal of competent
jurisdiction, such part, covenant or provision shall be construed to give it
maximum lawful validity and the remaining provisions of this Agreement shall
nonetheless remain in full force and effect.

     18. Entire Agreement. This Agreement and the attached "Schedule of
Benefits" contains the entire agreement of the parties relative to the subject
matter hereof, superseding and terminating all prior agreements or
understandings, whether oral or written, between the parties hereto relative to
the subject matter hereof, and this Agreement may not be extended, amended,
modified or supplemented without the written consent of the parties hereto.

     19. Waivers. Any waiver of the performance of the terms or provisions of
this Agreement shall be effective only if in writing and signed by the party
against whom such waiver is to be enforced. The failure of either party to
exercise any of his or its rights under this Agreement or to require the
performance of any term or provision of this Agreement, or the waiver by either
party of any breach of this Agreement, shall not prevent a subsequent exercise
or enforcement of such rights or be deemed a waiver of any subsequent breach of
the same or any other term or provision of this Agreement.

     20. Notices. Any notice required or permitted to be given under this
Agreement shall be in writing and shall be deemed given when personally
delivered or sent by registered or certified mail, postage prepaid, return
receipt requested, to the respective address of the parties hereto as set forth
above or to such other address as either party may designate to the other party
in the manner provided herein for giving notice.

     21. Successors and Assigns. This Agreement shall be binding upon and inure
to the benefit of the heirs, executors, administrators, successors and legal
representatives of the Employee, and shall inure to the benefit of and be
binding upon the Company and any successor to the business of the Company
pursuant to a merger or acquisition of all or substantially all of its assets,
but the obligations of the Employee may not be delegated and the Employee may
not assign, transfer, pledge, encumber, hypothecate or otherwise dispose of this
Agreement, or any of his rights hereunder (whether by operation of law or
otherwise), except as expressly permitted by this Agreement, and any such
attempted delegation or disposition shall be null and void and without effect.

     22. Governing Law. This Agreement shall be governed by and construed and
enforced in accordance with the laws of the State of Connecticut.

                                       5

<PAGE>   6

     IN WITNESS WHEREOF, the parties have executed this Agreement as of the date
first above written.

                                  WILTEK, INC.

                                  By:/s/ J.W. Fitzpatrick
                                     ------------------------------
                                           Chairman of the Board

                                  By:/s/ David S. Teitelman
                                     ------------------------------
                                           David S. Teitelman
                                           President & CEO

WITNESS:
/s/ Cindy L. Hampton
----------------------------

                                       6

<PAGE>   7

                              SCHEDULE OF BENEFITS

1.   Company Car. Company obligation is direct payment of, or reimbursement to
     the Employee, for all lease payments, tax payments, insurance payments,
     gasoline payments, service payments, repair payments, maintenance payments.
     This benefit will continue for two (2) months after termination.

2.   Complete Annual Physical Examination. Company obligation is reimbursement
     to the Employee for the cost of any fees or charges not covered under the
     Company's standard health insurance plan. This benefit is eliminated upon
     termination.

3.   Disability Policy. Company obligation is reimbursement to the Employee for
     the cost of the Employee maintaining a long-term disability insurance
     policy providing up to 70% of Annual Minimum Base Salary. This benefit is
     eliminated upon termination.

4.   Company Standard Benefits. Health, major medical, dental, eye care,
     orthodontia, life insurance, short- term disability, long-term disability,
     401K contribution, in addition to individual benefits provided within this
     section ("Schedule of Benefits") to the Employee.

5.   Annual Minimum Base Salary. $168,000.

6.   Guaranteed Severance Pay. Twelve (12) months of Annual Minimum Base Salary.

7.   Supplemental Severance Pay. If employment not found by Employee following
     Guaranteed Severance Pay Period, an additional six (6) months of Annual
     Minimum Base Salary.

8.   Consulting Division Sale Bonus. Ten percent (10%) of the selling price of
     the consulting division paid by the Company and allocated by the Employee
     to himself, other officers and other employees. The Company's obligation
     remains until the latter of December 31, 1999 or three (3) months after
     termination. The Company shall make full payment within five (5) business
     days of consulting division selling transaction.

9.   Revenue Bonus. If Wiltek reports fiscal year 1999 revenue (excluding any
     revenue for business's acquired after January 1, 1999) of at least

         $6,800,000 then a cash bonus of .60% of total fiscal year 1999 revenue
         $7,000,000 then a cash bonus of .64% of total fiscal year 1999 revenue
         $7,200,000 then a cash bonus of .68% of total fiscal year 1999 revenue
         $7,400,000 then a cash bonus of .72% of total fiscal year 1999 revenue
         $7,600,000 then a cash bonus of .76% of total fiscal year 1999 revenue
         $7,800,000 then a cash bonus of .80% of total fiscal year 1999 revenue
         $8,000,000 then a cash bonus of .84% of total fiscal year 1999 revenue
         $8,200,000 then a cash bonus of .88% of total fiscal year 1999 revenue
         $8,400,000 then a cash bonus of .92% of total fiscal year 1999 revenue
         $8,600,000 then a cash bonus of .96% of total fiscal year 1999 revenue
         $8,800,000 then a cash bonus of 1.00% of total fiscal year 1999 revenue

The Company shall make full cash bonus payment to Employee within 60 days
(December 30, 1999) of close of fiscal year 1999. In the event of termination
any bonus accumulated as of the date of termination will be payable by the
Company to the Employee within 30 days of termination.

                                       7

<PAGE>   8

     IN WITNESS WHEREOF, the parties have executed this Schedule of Benefits as
of the date first above written.

                               WILTEK, INC.

                               By:/s/ J.W. Fitzpatrick
                                  ------------------------------
                                        Chairman of the Board

                               By:/s/ David S. Teitelman
                                  ------------------------------
                                        David S. Teitelman
                                        President & CEO

WITNESS:
/s/ Cindy L. Hampton
---------------------------

                                       8

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