Document:

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                                  Exhibit 4.2

                         REGISTRATION RIGHTS AGREEMENT

     This REGISTRATION RIGHTS AGREEMENT, dated as of March 23, 2000 (this

"Agreement"), is made by and among Greater Bay Bancorp., a California
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corporation (the "Company"), and the investors named on the signature pages
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hereto (the "Initial Investors").
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                                   RECITALS:

     A.  In connection with the Securities Purchase Agreement dated March 22,
2000 between the Initial Investors and the Company (the "Purchase Agreement"),
                                                         ------------------
the Company has agreed, upon the terms and subject to the conditions of the
Purchase Agreement, to issue and sell to the Initial Investors 324,324 shares of
the Company's Common Stock (the "Common Shares").
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     B.  In order to induce the Initial Investors to execute and deliver the
Purchase Agreement, the Company has agreed to provide certain registration
rights under the Securities Act and applicable state securities laws with
respect to the Common Shares.

     In consideration of the premises and the mutual covenants contained herein
and other good and valuable consideration, the receipt and sufficiency of which
are hereby acknowledged, the Company and the Initial Investors hereby agree as
follows:

                                   ARTCILE 1
                                  DEFINITIONS

     Capitalized terms used and not otherwise defined herein have the respective
meanings given them set forth in the Purchase Agreement.  In addition, as used
in this Agreement, the following terms have the following meanings:

     1.1  "Common Shares" means the shares of Common Stock sold pursuant to the
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Purchase Agreement.

     1.2 "Investors" means the Initial Investors and any of their transferees or
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assignees who agree to become bound by the provisions of this Agreement in
accordance with Article IX hereof.

     1.3  "Registrable Securities" means the Common Shares sold pursuant to the
           ----------------------
Purchase Agreement and any shares of capital stock issued or issuable from time
to time (with any adjustments) in exchange for or otherwise with respect to the
Common Shares.

     1.4 "Registration Period" means the period between the date of this
          -------------------
Agreement and the earlier of (i) the date on which all of the Registrable
Securities have been sold and no further Registrable Securities may be issued in
the future, (ii) the date on which all the Registrable Securities (in the
opinion of the Investors' counsel) may be immediately sold without registration
and without limitation as to volume by each holder thereof as to the number of
Registrable

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Securities to be sold, pursuant to Rule 144 or otherwise, or (iii) the second
anniversary of the date of this Agreement.

     1.5  "Registration Statement" means a Registration Statement of the Company
           ----------------------
filed under the Securities Act.

     1.6  The terms "register," "registered," and "registration" refer to a
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registration effected by preparing and filing a Registration Statement or
statements in compliance with the Securities Act and pursuant to Rule 415 and
the declaration or ordering of effectiveness of such Registration Statement by
the SEC.

     1.7 "Rule 415" means Rule 415 under the Securities Act, or any successor
          --------
Rule providing for offering securities on a continuous basis, and applicable
rules and regulations thereunder.

                                  ARTICLE II
                                  REGISTRATION

     2.1 Mandatory Registration. The Company will use its commercially
         ----------------------
reasonable efforts to file with the SEC a Registration Statement on Form S-3
registering the Registrable Securities and no other securities for resale within
30 business days after the Closing Date of the purchase of the Common Shares
under the Purchase Agreement. If Form S-3 is not available at that time, then
the Company will file a Registration Statement on such form as is then available
to effect a registration of the Registrable Securities, subject to the consent
of the Initial Investors, which consent will not be unreasonably withheld.

     2.2  Effectiveness of the Registration Statement.  The Company will use its
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commercially reasonable efforts to cause the Registration Statement to be
declared effective by the SEC as soon as practicable after filing, and in any
event no later than the 90th day after the Closing Date (the "Required Effective
                                                              ------------------
Date").  However, so long as the Company filed the Registration Statement within
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30 business days after the Closing Date, if the Registration Statement receives
SEC review, then the Required Effective Date will be the 120th day after the
Closing Date.  The Company's commercially reasonable efforts will include, but
not be limited to, promptly responding to all comments received from the staff
of the SEC.  If the Company receives notification from the SEC that the
Registration Statement will receive no action or review from the SEC, then the
Company will, subject to its rights under Section 3.5, cause the Registration
Statement to become effective within five business days after such SEC
notification.  Once the Registration Statement is declared effective by the SEC,
the Company will use its commercially reasonable efforts to cause the
Registration Statement to remain effective throughout the Registration Period,
subject to the Company's rights under Section 3.5.

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     2.3  Piggyback Registrations.
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        (a) If, at any time prior to the expiration of the Registration Period,
a Registration Statement is not effective with respect to all of the Registrable
Securities and the Company decides to register any of its Common Stock for its
own account or for the account of others, then the Company will promptly give
the Investors written notice thereof and will use its commercially reasonable
efforts to include in such registration all or any part of the Registrable
Securities requested by such Investors to be included therein (excluding any
Registrable Securities previously included in a Registration Statement). This
requirement does not apply to Company registrations on Form S-3, Form S-4 or
Form S-8 or their equivalents relating to (i) Common Stock to be issued solely
in connection with a dividend reinvestment plan or an acquisition of any entity
or business or (ii) Common Stock issuable in connection with stock option or
other employee benefit plans. Each Investor must give its request for
registration under this paragraph to the Company in writing within 15 days after
receipt from the Company of notice of such pending registration. If the
registration for which the Company gives notice is a public offering involving
an underwriting, the Company will so advise the Investors as part of the above-
described written notice. In that event, if the managing underwriter(s) of the
public offering impose a limitation on the number of shares of Common Stock that
may be included in the Registration Statement because, in such underwriter(s)'
judgment, such limitation would be necessary to effect an orderly public
distribution, then the Company will be obligated to include only such limited
portion, if any, of the Registrable Securities with respect to which such
Investors have requested inclusion hereunder. Any exclusion of Registrable
Securities will be made pro rata among all holders of the Company's securities
seeking to include shares of Common Stock in proportion to the number of shares
of Common Stock sought to be included by those holders. However, the Company
will not exclude any Registrable Securities unless the Company has first
excluded all outstanding securities the holders of which are not entitled by
right to inclusion of securities in such Registration Statement or are not
entitled pro rata inclusion with the Registrable Securities. No Investor may
participate in any distribution of Common Stock under this Section 2.4 unless
such Investor (i) agrees to sell such Investor's Registrable Securities on the
basis provided in any underwriting arrangements or other plan of distribution
approved by the Company in its sole discretion, (ii) completes and executes all
questionnaires, powers of attorney, indemnities, underwriting agreements and
other documents reasonably required under the terms of such underwriting
arrangements or other plan of distribution, and (iii) agrees to pay its pro rata
share of all underwriting discounts and commissions and other fees and expenses
of investment bankers and any manager or managers of such underwriting, and
legal expenses of the underwriter, applicable with respect to its Registrable
Securities, in each case to the extent not payable by the Company under the
terms of this Agreement.

        (b) No right to registration of Registrable Securities under this
Section 2.3 limits in any way the registration required under Section 2.1 above.
The obligations of the Company under this Section 2.3 expire upon the earlier of
(i) the effectiveness of the Registration Statement filed pursuant to Section
2.1 above, (ii) after the Company has afforded the opportunity for the Investors
to exercise registration rights under this Section 2.3 for two registrations
(provided, however, that any Investor that has had any Registrable Securities
excluded from any Registration Statement in accordance with this Section 2.3 may
include in any additional Registration Statement filed by the Company the
Registrable Securities so excluded), (iii) when all of the Registrable
Securities held by any Investor may be sold by such Investor under Rule 144

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without being subject to any volume restrictions, or (iv) the second anniversary
of the date of this Agreement.

     2.4 Eligibility to use Form S-3. The Company represents and warrants that
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it meets the requirements for the use of Form S-3 for registration of the sale
by the Investors of the Registrable Securities. The Company will use its
commercially reasonable efforts to file all reports required to be filed by the
Company with the SEC in a timely manner so as to preserve its eligibility for
the use of Form S-3.

                                  ARTICLE III
                     ADDITIONAL OBLIGATIONS OF THE COMPANY

     3.1  Continued Effectiveness of Registration Statement.  Subject to the
          -------------------------------------------------
Company's rights under Section 3.5, the Company will keep the Registration
Statement covering the Registrable Securities effective under Rule 415 at all
times during the Registration Period.

     3.2 Accuracy of Registration Statement. Subject to the Company's rights
         ----------------------------------
under Section 3.5, any Registration Statement (including any amendments or
supplements thereto and prospectuses contained therein) filed by the Company
covering Registrable Securities will not contain any 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, in light of the circumstances in which
they were made, not misleading. Subject to the limitations set forth in Section
3.5, the Company will prepare and file with the SEC such amendments (including
post-effective amendments) and supplements to the Registration Statement and the
prospectus used in connection with the Registration Statement as may be
necessary to permit sales pursuant to the Registration Statement at all times
during the Registration Period, and, during such period, will comply with the
provisions of the Securities Act with respect to the disposition of all
Registrable Securities of the Company covered by the Registration Statement
until the termination of the Registration Period, or if earlier, until such time
as all of such Registrable Securities have been disposed of in accordance with
the intended methods of disposition by the seller or sellers thereof as set
forth in the Registration Statement.

     3.3 Furnishing Documentation. The Company will furnish to each Investor
         ----------------------------------
whose Registrable Securities are included in a Registration Statement, and to
its legal counsel, (a) promptly after each document is prepared and publicly
distributed, filed with the SEC or received by the Company, one copy of any
Registration Statement filed pursuant to this Agreement and any amendments
thereto, each preliminary prospectus and final prospectus and each amendment or
supplement thereto; and, in the case of a Registration Statement filed under
Section 2.1 above, each letter written by or on behalf of the Company to the SEC
and each item of correspondence from the SEC or the staff of the SEC, in each
case relating to such Registration Statement (other than any portion of any item
thereof which contains information for which the Company has sought confidential
treatment); and (b) a number of copies of a prospectus, including a preliminary
prospectus, and all amendments and supplements thereto, and such other documents
as the Investor may reasonably request in order to facilitate the disposition of
the Registrable Securities owned by the Investor. The Company will immediately
notify by facsimile each Investor whose Registrable Securities are included in
any Registration Statement of the effectiveness of the Registration Statement
and any post-effective amendment.

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     3.4 Additional Obligations. The Company will use its commercially
         ----------------------
reasonable efforts to (a) register and qualify the Registrable Securities
covered by a Registration Statement under such other securities or blue sky laws
of such jurisdictions as each Investor who holds (or has the right to hold)
Registrable Securities being offered reasonably requests, (b) prepare and file
in those jurisdictions any amendments (including post-effective amendments) and
supplements to such registrations and qualifications as may be necessary to
maintain their effectiveness during the Registration Period, (c) take any other
actions necessary to maintain such registrations and qualifications in effect at
all times during the Registration Period, and (d) take any other actions
reasonably necessary or advisable to qualify the Registrable Securities for sale
in such jurisdictions. Notwithstanding the foregoing, the Company is not
required, in connection with such obligations, to (i) qualify to do business in
any jurisdiction where it would not otherwise be required to qualify but for
this Section 3.4, (ii) subject itself to general taxation in any such
jurisdiction, (iii) file a general consent to service of process in any such
jurisdiction, (iv) provide any undertakings that cause material expense or
burden to the Company, or (v) make any change in its articles of incorporation
or bylaws, which in each case the Board of Directors of the Company determines
to be contrary to the best interests of the Company and its shareholders.

     3.5 Suspension of Registration.
         --------------------------

         (a) The Company will notify (by telephone or electronic mail and also
by facsimile or reputable overnight courier) each Investor who holds Registrable
Securities being sold pursuant to a Registration Statement of the happening of
any event of which the Company has knowledge as a result of which the prospectus
included in the Registration Statement as then in effect includes an untrue
statement of a material fact or omits to state a material fact required to be
stated therein or necessary to make the statements therein, in light of the
circumstances under which they were made, not misleading. The Company will make
such notification as promptly as practicable after the Company becomes aware of
the event (but in no event, without the prior written consent of the Investor,
will the Company disclose to any Investor any of the facts or circumstances
regarding the event), will promptly (but in no event more than 15 business days)
prepare a supplement or amendment to the Registration Statement to correct such
untrue statement or omission, and will deliver a number of copies of such
supplement or amendment to each Investor as such Investor may reasonably
request.

         (b) Notwithstanding anything to the contrary contained in this
Agreement, if in the good faith judgment of the Company resales of Registrable
Securities made pursuant to the Registration Statement might require disclosure
of material information that (i) might interfere with or affect any financing,
acquisition, or other significant transaction being contemplated by the Company,
whether or not a final determination has been made to undertake such
transaction, or (ii) the Company has a bona fide business purpose for preserving
as confidential, and, with respect to each of (i) and (ii) that the Company is
not otherwise required by applicable securities laws or regulations to disclose,
the Company will have the right to delay the effectiveness of the Registration
Statement or suspend the use of the Registration Statement for a period of not
more than 30 consecutive days and for no more than 120 days in the aggregate
during any twelve month period; provided, however, such 30 day period may upon
notice to the Investors be extended for up to an additional 30 days if such
additional time is reasonably necessary to complete financial statements or
reports or other disclosure materials reasonably necessary to be disclosed in
the Registration Statement.

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         (c) Subject to the Company's rights under this Section 3, the Company
will use its commercially reasonable efforts to prevent the issuance of any stop
order or other suspension of effectiveness of a Registration Statement and, if
such an order is issued, will use its commercially reasonable efforts to obtain
the withdrawal of such order at the earliest possible time and to notify each
Investor that holds Registrable Securities being sold of the issuance of such
order and the resolution thereof.

         (d) If the use of the Registration Statement is suspended by the
Company, the Company will promptly give notice of the suspension to all
Investors whose securities are covered by the Registration Statement, and will
promptly notify each such Investor as soon as the use of the Registration
Statement may be resumed.

     3.6 Review by the Investors. The Company will permit a single firm of legal
         -----------------------
counsel, designated by the Investors who hold a majority in interest of the
Registrable Securities being sold pursuant to a Registration Statement, to
review the Registration Statement and all amendments and supplements thereto (as
well as all requests for acceleration or effectiveness thereof) a reasonable
period of time prior to their filing with the SEC, and will not file any
document in a form to which such counsel reasonably objects, unless otherwise
required by law in the opinion of the Company's counsel. The sections of any
such Registration Statement including information with respect to the Investors,
the Investors' beneficial ownership of securities of the Company or the
Investors' intended method of disposition of Registrable Securities must conform
to the information provided to the Company by each of the Investors.

     3.7 Information. The Company will make generally available to its security
         -----------
holders as soon as practicable, but not later than 90 days after the close of
the period covered thereby, an earnings statement (in a form complying with the
provisions of Rule 158 under the Securities Act) covering a 12-month period
beginning not later than the first day of the Company's fiscal quarter next
following the effective date of the Registration Statement.

     3.8 Due Diligence; Confidentiality.
         ------------------------------
         (a) The Company will make available for inspection by any Investor
whose Registrable Securities are being sold pursuant to a Registration Statement
and one firm of attorneys retained by the Investors (collectively, the
"Inspectors"), all pertinent financial and other records, pertinent corporate
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documents and properties of the Company (collectively, the "Records"), as each
                                                            -------
Inspector reasonably deems necessary to enable the Inspector to exercise its due
diligence responsibility. The Company will cause its officers, directors and
employees to supply all information that any Inspector may reasonably request
for purposes of performing such due diligence.

         (b) Each Inspector will hold in confidence, and will not make any
disclosure (except to an Investor) of, any Records or other information that the
Company determines in good faith to be confidential, and of which determination
the Inspectors are so notified, unless (i) the disclosure of such Records is
necessary to avoid or correct a misstatement or omission in any Registration
Statement, (ii) the release of such Records is ordered pursuant to a subpoena or
other order from a court or government body of competent jurisdiction, or (iii)
the information in such Records has been made generally available to the public
other than by disclosure in violation of

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this or any other agreement. The Company is not required to disclose any
confidential information in the Records to any Inspector unless and until such
Inspector has entered into a confidentiality agreement (in form and substance
satisfactory to the Company) with the Company with respect thereto,
substantially in the form of this Section 3.8. Each Investor will, upon learning
that disclosure of Records containing confidential information is sought in or
by a court or governmental body of competent jurisdiction or through other
means, give prompt notice to the Company and allow the Company, at the Company's
expense, to undertake appropriate action to prevent disclosure of, or to obtain
a protective order for, the Records deemed confidential. Nothing herein will be
deemed to limit the Investor's ability to sell Registrable Securities in a
manner that is otherwise consistent with applicable laws and regulations.

         (c) The Company will hold in confidence, and will not make any
disclosure of, information concerning an Investor provided to the Company under
this Agreement unless (i) disclosure of such information is necessary to comply
with federal or state securities laws, (ii) the disclosure of such information
is necessary to avoid or correct a misstatement or omission in any Registration
Statement, (iii) the release of such information is ordered pursuant to a
subpoena or other order from a court or governmental body of competent
jurisdiction, (iv) such information has been made generally available to the
public other than by disclosure in violation of this Agreement or any other
agreement, or (v) such Investor consents to the form and content of any such
disclosure. If the Company learns that disclosure of such information concerning
an Investor is sought in or by a court or governmental body of competent
jurisdiction or through other means, the Company will give prompt notice to such
Investor prior to making such disclosure and allow such Investor, at its
expense, to undertake appropriate action to prevent disclosure of, or to obtain
a protective order for, such information.

     3.9 Listing. The Company will use its commercially reasonable efforts (i)
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to cause all of the Registrable Securities covered by each Registration
Statement to be listed on each national securities exchange on which securities
of the same class or series issued by the Company are then listed, if any, if
the listing of such Registrable Securities is then permitted under the rules of
such exchange, or (ii) to the extent the securities of the same class or series
are not then listed on a national securities exchange, to secure the designation
and quotation of all of the Registrable Securities covered by each Registration
Statement on Nasdaq and, without limiting the generality of the foregoing,
arrange for at least two market makers to register with the National Association
of Securities Dealers, Inc. as such with respect to such Registrable Securities.

     3.10 Transfer Agent; Registrar. The Company will provide a transfer agent
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and registrar, which may be a single entity, for the Registrable Securities not
later than the effective date of the Registration Statement.

     3.11 Share Certificates. The Company will cooperate with the Investors who
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hold Registrable Securities being sold to facilitate the timely preparation and
delivery of certificates (not bearing any restrictive legends) representing
Registrable Securities to be offered pursuant to a Registration Statement and
will enable such certificates to be in such denominations or amounts as the case
may be, and registered in such names as the Investors may reasonably request,
all in accordance with Article V of the Purchase Agreement.

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     3.12 Plan of Distribution. At the request of the Investors holding a
          --------------------
majority in interest of the Registrable Securities registered pursuant to a
Registration Statement, the Company will promptly prepare and file with the SEC
such amendments (including post-effective amendments) and supplements to the
Registration Statement, and the prospectus used in connection with the
Registration Statement, as may be necessary in order to change the plan of
distribution set forth in such Registration Statement. Notwithstanding the
foregoing, each Investor agrees that the Investors may not change the plan of
distribution to involve an underwritten offering.

     3.13 Securities Laws Compliance. The Company will comply with all
          --------------------------
applicable laws related to any Registration Statement relating to the sale of
Registrable Securities and to offering and sale of securities and with all
applicable rules and regulations of governmental authorities in connection
therewith (including, without limitation, the Securities Act, the Exchange Act
and the rules and regulations promulgated by the SEC).

     3.14 Further Assurances.  Subject to the limitations set forth in the last
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sentence of Section 3.12, the Company will take all other reasonable actions as
any Investor may reasonably request to expedite and facilitate disposition by
such Investor of the Registrable Securities pursuant to the Registration
Statement.

     3.15 No Additional Selling Shareholders. The Company will not, and will not
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agree to, allow the holders of any securities of the Company to include any of
their securities in any Registration Statement under Section 2.1 hereof, or any
amendment or supplement thereto under Section 3.2 hereof, without the consent of
the holders of a majority in interest of the Registrable Securities.

                                  ARTICLE IV
                          OBLIGATIONS OF THE INVESTORS

     4.1 Investor Information. As a condition to the obligations of the Company
         --------------------
to complete any registration pursuant to this Agreement with respect to the
Registrable Securities of each Investor, such Investor will furnish to the
Company such information regarding itself, the Registrable Securities held by it
and the intended method of disposition of the Registrable Securities held by it
as is reasonably required by the Company to effect the registration of the
Registrable Securities. At least five (5) business days prior to the first
anticipated filing date of a Registration Statement for any registration under
this Agreement, the Company will notify each Investor of the information the
Company requires from that Investor if the Investor elects to have any of its
Registrable Securities included in the Registration Statement. If, within three
business days prior to the filing date, the Company has not received the
requested information from an Investor, then the Company may file the
Registration Statement without including Registrable Securities of that
Investor.

     4.2 Further Assurances. Each Investor will cooperate with the Company, as
         ------------------
reasonably requested by the Company, in connection with the preparation and
filing of any Registration Statement hereunder, unless such Investor has
notified the Company in writing of such Investor's election to exclude all of
such Investor's Registrable Securities from the Registration Statement.

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     4.3 Suspension of Transactions. Upon receipt of any notice from the Company
         --------------------------
of the happening of any event of the kind described in Section 3.5, each
Investor agrees that it (a) will immediately discontinue disposition of
Registrable Securities pursuant to the Registration Statement covering such
Registrable Securities (b) will not disclose to any other person that its use of
the Registration Statement has been suspended and (c) will not, either directly
or indirectly, engage in any transaction involving any of the securities of the
Company, until with respect to each of (a), (b) and (c), it receives copies of
the supplemented or amended prospectus contemplated by Section 3.5 or is
otherwise notified by the Company that the use of the Registration Statement may
be resumed. If so directed by the Company, each Investor will deliver to the
Company (at the expense of the Company) or destroy (and deliver to the Company a
certificate of destruction) all copies in the Investor's possession (other than
a limited number of file copies) of the prospectus covering such Registrable
Securities that is current at the time of receipt of such notice.

                                   ARTICLE V
                            EXPENSES OF REGISTRATION

     The Company will bear all reasonable expenses, other than underwriting
discounts and commissions, and transfer taxes, if any, incurred in connection
with registrations, filings or qualifications pursuant to Article II of this
Agreement, including, without limitation, all registration, listing and
qualifications fees, printers and accounting fees, the fees and disbursements of
counsel for the Company, and the reasonable fees and disbursements of one firm
of legal counsel selected by the Initial Investors pursuant to Section 3.6
hereof.

                                  ARTICLE VI
                                INDEMNIFICATION

     In the event that any Registrable Securities are included in a Registration
Statement under this Agreement:

     6.1  To the extent permitted by law, the Company will indemnify and hold
harmless each Investor that holds such Registrable Securities, any directors or
officers of such Investor and any person who controls such Investor within the
meaning of the Securities Act or the Exchange Act (each, an "Indemnified
                                                             -----------
Person") against any losses, claims, damages, expenses or liabilities (joint or
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several) (collectively, and together with actions, proceedings or inquiries by
any regulatory or self-regulatory organization, whether commenced or threatened
in respect thereof, "Claims") to which any of them become subject under the
                     ------
Securities Act, the Exchange Act or otherwise, insofar as such Claims arise out
of or are based upon any of the following statements, omissions or violations in
a Registration Statement filed pursuant to this Agreement, any post-effective
amendment thereof or any prospectus included therein:  (a) any untrue statement
or alleged untrue statement of a material fact contained in the Registration
Statement or any post-effective amendment thereof or the omission or alleged
omission to state therein a material fact required to be stated therein or
necessary to make the statements therein not misleading, (b) any untrue
statement or alleged untrue statement of a material fact contained in the
prospectus (as it may be amended or supplemented) or the omission or alleged
omission to state therein any material fact necessary to make the statements
made therein, in light of the circumstances under which the statements therein
were made, not misleading, or (c) any violation or alleged violation

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by the Company of the Securities Act, the Exchange Act or any other law,
including without limitation any state securities law or any rule or regulation
thereunder (the matters in the foregoing clauses (a) through (c) being,
collectively, "Violations"). Subject to the restrictions set forth in Section
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6.3 with respect to the number of legal counsel, the Company will reimburse the
Investors and each such other Indemnified Person, promptly as such expenses are
incurred and are due and payable, for any legal fees or other reasonable
expenses incurred by them in connection with investigating or defending any
Claim. Notwithstanding anything to the contrary contained herein, the
indemnification agreement contained in this Section 6.1 (i) does not apply to a
Claim arising out of or based upon a Violation that occurs in reliance upon and
in conformity with information furnished in writing to the Company by any
Indemnified Person expressly for use in connection with the preparation of the
Registration Statement or any such amendment thereof or supplement thereto, (ii)
does not apply to amounts paid in settlement of any Claim if such settlement is
made without the prior written consent of the Company, which consent will not be
unreasonably withheld, and (iii) with respect to any prospectus, does not apply
and shall not inure to the benefit of any Indemnified Person if the untrue
statement or omission of material fact contained in such prospectus was
corrected on a timely basis and the prospectus, as then amended or supplemented,
if such corrected prospectus was timely made available by the Company pursuant
to Section 3.3 hereof, and the Indemnified Person was promptly advised in
writing not to use the incorrect prospectus prior to the use giving rise to a
Violation and such Indemnified Person, notwithstanding such advice, used it.
This indemnity obligation will remain in full force and effect regardless of any
investigation made by or on behalf of the Indemnified Persons and will survive
the transfer of the Registrable Securities by the Investors under Article IX of
this Agreement.

     6.2  In connection with any Registration Statement in which an Investor is
participating, each such Investor will indemnify and hold harmless, to the same
extent and in the same manner set forth in Section 6.1 above, the Company, each
of its directors, each of its officers who signs the Registration Statement,
each person, if any, who controls the Company within the meaning of the
Securities Act or the Exchange Act, and any other Shareholder selling securities
pursuant to the Registration Statement or any of its directors or officers or
any person who controls such Shareholder within the meaning of the Securities
Act or the Exchange Act (each an "Indemnified Person") against any Claim to
                                  ------------------
which any of them may become subject under the Securities Act, the Exchange Act
or otherwise, insofar as such Claim arises out of or is based upon any
Violation, in each case to the extent (and only to the extent) that such
Violation occurs in reliance upon and in conformity with written information
furnished to the Company by such Investor expressly for use in connection with
such Registration Statement.  Subject to the restrictions set forth in Section
6.3, such Investor will promptly reimburse any legal or other expenses (promptly
as such expenses are incurred and due and payable) reasonably incurred by them
in connection with investigating or defending any such Claim.  However, the
indemnity agreement contained in this Section 6.2 does not apply to amounts paid
in settlement of any Claim if such settlement is effected without the prior
written consent of such Investor, which consent will not be unreasonably
withheld, and no Investor will be liable under this Agreement (including this
Section 6.2 and Article VII) for the amount of any Claim that exceeds the net
proceeds actually received by such Investor as a result of the sale of
Registrable Securities pursuant to such Registration Statement.  This indemnity
will remain in full force and effect regardless of any investigation made by or
on behalf of an Indemnified Party and will survive the transfer of the
Registrable Securities by the Investors under Article IX of this Agreement.
Notwithstanding anything to the contrary contained herein, the

                                       10
<PAGE>

Indemnification Agreement contained in this Section 6.2 with respect to any
prospectus does not apply to and shall not inure to the benefit of any
Indemnified Party if the untrue statement or omission of material fact by the
Investor contained in the prospectus was corrected on a timely basis and the
prospectus, as then amended or supplemented, and the Indemnified Party failed to
utilize such corrected prospectus.

     6.3 Promptly after receipt by an Indemnified Person under this Article VI
of notice of the commencement of any action (including any governmental action),
such Indemnified Person will, if a Claim in respect thereof is to be made
against any indemnifying party under this Article VI, deliver to the
indemnifying party a written notice of the commencement thereof. The
indemnifying party may participate in, and, to the extent the indemnifying party
so desires, jointly with any other indemnifying party similarly given notice,
assume control of the defense thereof with counsel mutually satisfactory to the
indemnifying parties and the Indemnified Person. In that case, the indemnifying
party will diligently pursue such defense. If, in the reasonable opinion of
counsel retained by the indemnifying party, the representation by such counsel
of the Indemnified Person and the indemnifying party would be inappropriate due
to actual or potential conflicts of interest between the Indemnified Person and
any other party represented by such counsel in such proceeding or the actual or
potential defendants in, or targets of, any such action including the
Indemnified Person, and any such Indemnified Person reasonably determines that
there may be legal defenses available to such Indemnified Person that are
different from or in addition to those available to the indemnifying party, then
the Indemnified Person is entitled to assume such defense and may retain its own
counsel, with the fees and expenses to be paid by the indemnifying party. The
Company will pay for only one separate legal counsel for the Investors
collectively, and such legal counsel will be selected by the Investors holding a
majority in interest of the Registrable Securities. The failure to deliver
written notice to the indemnifying party within a reasonable time of the
commencement of any such action does not relieve an indemnifying party of any
liability to an Indemnified Person under this Article 6, except to the extent
that the indemnifying party is prejudiced in its ability to defend such action.
The indemnification required by this Article 6 will be made by periodic payments
of the amount thereof during the course of the investigation or defense, as such
expense, loss, damage or liability is incurred and is due and payable.

                                  ARTICLE VII
                                  CONTRIBUTION

     To the extent that any indemnification provided for herein is prohibited or
limited by law, the indemnifying party will make the maximum contribution with
respect to any amounts for which it would otherwise be liable under Article 6 to
the fullest extent permitted by law.   However, (a) no contribution will be made
under circumstances where the maker would not have been liable for
indemnification under the fault standards set forth in Article 6, (b) no seller
of Registrable Securities guilty of fraudulent misrepresentation (within the
meaning of Section 11(f) of the Securities Act) will be entitled to contribution
from any seller of Registrable Securities who was not guilty of such fraudulent
misrepresentation, and (c) contribution (together with any indemnification or
other obligations under this Agreement) by any seller of Registrable Securities
will be limited in amount to the net amount of proceeds received by such seller
from the sale of such Registrable Securities.

                                       11
<PAGE>

                                 ARTICLE VIII
                             EXCHANGE ACT REPORTING

     In order to make available to the Investors the benefits of Rule 144 or any
similar rule or regulation of the SEC that may at any time permit the Investors
to sell securities of the Company to the public without registration, the
Company will use it commercially reasonable efforts to:

        (a) File with the SEC in a timely manner, and make and keep available,
all reports and other documents required of the Company under the Securities Act
and the Exchange Act so long as the Company remains subject to such requirements
(it being understood that nothing herein limits the Company's obligations under
Section 4.3 of the Purchase Agreement) and the filing and availability of such
reports and other documents is required for the applicable provisions of Rule
144; and

        (b) Furnish to each Investor, so long as such Investor holds Registrable
Securities, promptly upon the Investor's request, (i) a written statement by the
Company that it has complied with the reporting requirements of Rule 144, the
Securities Act and the Exchange Act, (ii) a copy of the most recent annual or
quarterly report of the Company and such other reports and documents filed by
the Company with the SEC and (iii) such other information as may be reasonably
requested to permit the Investors to sell such securities pursuant to Rule 144
without registration.

                                  ARTICLE IX
                       ASSIGNMENT OF REGISTRATION RIGHTS

     The rights of the Investors hereunder, including the right to have the
Company register Registrable Securities pursuant to this Agreement, will be
automatically assigned by the Investors to transferees or assignees of all or
any portion of the Registrable Securities, but only if (a) the Investor agrees
in writing with the transferee or assignee to assign such rights, and a copy of
such agreement is furnished to the Company within a reasonable time after such
assignment, (b) the Company is, within a reasonable time after such transfer or
assignment, furnished with written notice of the name and address of such
transferee or assignee and the securities with respect to which such
registration rights are being transferred or assigned, (c) after such transfer
or assignment, the further disposition of such securities by the transferee or
assignee is restricted under the Securities Act and applicable state securities
laws, (d) at or before the time the Company received the written notice
contemplated by clause (b) of this sentence, the transferee or assignee agrees
in writing with the Company to be bound by all of the provisions contained
herein, (e) such transfer is made in accordance with the applicable requirements
of the Purchase Agreement, and (f) the transferee is an "accredited investor" as
that term is defined in Rule 501 of Regulation D.

                                   ARTICLE X
                        AMENDMENT OF REGISTRATION RIGHTS

     This Agreement may be amended and the obligations hereunder may be waived
(either generally or in a particular instance, and either retroactively or
prospectively) only with the written consent of the Company and of the Investors
who then hold a majority in interest of the Registrable Securities (but not
including any Investor who is not affected by such amendment or

                                       12
<PAGE>

waiver). Any amendment or waiver effected in accordance with this Article X is
binding upon each Investor and the Company. Notwithstanding the foregoing, no
amendment or waiver will retroactively affect any Investor without its consent,
or will prospectively adversely affect any Investor who no longer owns any
Registrable Securities without its consent. Neither Article VI nor Article VII
hereof may be amended or waived in a manner adverse to an Investor without its
consent.

                                  ARTICLER XI
                                 MISCELLANEOUS

     11.1 Conflicting Instructions. A person or entity is deemed to be a holder
          ------------------------
of Registrable Securities whenever such person or entity owns of record such
Registrable Securities. If the Company receives conflicting instructions,
notices or elections from two or more persons or entities with respect to the
same Registrable Securities, the Company will act upon the basis of
instructions, notice or election received from the registered owner of such
Registrable Securities.

     11.2 Notices. Any notices required or permitted to be given under the terms
          -------
of this Agreement will be given as set forth in the Purchase Agreement.

     11.3 Waiver. Failure of any party to exercise any right or remedy under
          ------
this Agreement or otherwise, or delay by a party in exercising such right or
remedy, does not operate as a waiver thereof.

     11.4 Governing Law.  This Agreement will be governed by and interpreted in
          -------------
accordance with the laws of the State of California without regard to the
principles of conflict of laws.  The parties hereto hereby submit to the
exclusive jurisdiction of the United States federal and state courts located in
the State of California with respect to any dispute arising under this
Agreement, the agreements entered into in connection herewith or the
transactions contemplated hereby or thereby.

     11.5 Severability. If any provision of this Agreement is invalid or
          ------------
unenforceable under any applicable statute or rule of law, then such provision
will be deemed modified in order to conform with such statute or rule of law.
Any provision hereof that may prove invalid or unenforceable under any law will
not affect the validity or enforceability of any other provision hereof.

     11.6 Entire Agreement. This Agreement and the Purchase Agreement,
          ----------------
(including all schedules and exhibits thereto) constitute the entire agreement
among the parties hereto with respect to the subject matter hereof and thereof.
There are no restrictions, promises, warranties or undertakings, other than
those set forth or referred to herein or therein. This Agreement supersedes all
prior agreements and understandings among the parties hereto with respect to the
subject matter hereof.

     11.7 Successors and Assigns. Subject to the requirements of Article 9
          ----------------------
hereof, this Agreement inures to the benefit of and is binding upon the
successors and assigns of each of the parties hereto.

                                       13
<PAGE>

     11.8 Use of Pronouns. All pronouns refer to the masculine, feminine or
          ---------------
neuter, singular or plural, as the context may require.

     11.9 Headings. The headings of this Agreement are for convenience of
          --------
reference only, are not part of this Agreement and do not affect its
interpretation.

     11.10 Counterparts. This Agreement may be executed in two or more
           ------------
counterparts, each of which is deemed an original but all of which constitute
one and the same agreement. This Agreement, once executed by a party, may be
delivered to the other party hereto by facsimile transmission, and facsimile
signatures are binding on the parties hereto. In the event any signature is
delivered by facsimile transmission, the party using such means of delivery
shall cause the manually executed pages to be physically delivered to the other
party within 5 business days of the execution hereof.

    11.11 Further Assurances. Each party will do and perform, or cause to be
          ------------------
done and performed, all such further acts and things, and will execute and
deliver all other agreements, certificates, instruments and documents, as
another party may reasonably request in order to carry out the intent and
accomplish the purposes of this Agreement and the consummation of the
transactions contemplated hereby.

     11.12 Consents. All consents and other determinations to be made by the
           --------
Investors pursuant to this Agreement will be made by the Initial Investors or
the Investors holding a majority in interest of the Registrable Securities.

     11.13 No Strict Construction. The language used in this Agreement is deemed
           ----------------------
to be the language chosen by the parties to express their mutual intent, and no
rules of strict construction will be applied against any party.

                                       14
<PAGE>

     IN WITNESS WHEREOF, the undersigned Investors and the Company have caused
this Agreement to be duly executed as of the date first above written.

                              COMPANY:

                              GREATER BAY BANCORP.

                              By: /s/ Steven C. Smith
                                  -------------------
                              Name:  Steven. C. Smith
                              Title: Executive Vice President, Chief
                              Administrative Officer and Chief Financial Officer

                      [Signatures continued on next page]

                                       15
<PAGE>

                              INVESTOR: FRANKLIN SMALL CAP GROWTH FUND

                              By: /s/ Murray L. Simpson
                                  ------------------------------
                                  Name: Murray L. Simpson
                                  Its:  Vice President

                              INVESTOR: EMERGING SMALL COMPANY TRUST

                              By: /s/ Murray L. Simpson
                                  ------------------------------
                                  Name: Murray L. Simpson
                                  Its:  Vice President

                              INVESTOR: U.S. SMALL CAP FUND

                              By: /s/ Murray L. Simpson
                                  ------------------------------
                                  Name: Murray L. Simpson
                                  Its:  Vice President

                              INVESTOR: FRANKLIN SMALL CAP INVESTMENTS FUND

                              By: /s/ Murray L. Simpson
                                  ------------------------------
                                  Name: Murray L. Simpson
                                  Its:  Vice President

                              INVESTOR: MERRILL LYNCH GLOBAL FINANCIAL
                                        SERVICES PORTFOLIO, INC.

                              By: /s/ James Ellman
                                  ------------------------------
                                  Name: James Ellman
                                  Its:  Vice President and Portfolio Manager

                              INVESTOR: MERRILL LYNCH EQUITY CONVERTIBLE SERIES-
                                        FINANCIAL SERVICES PORTFOLIO

                              By: /s/ Andrea Mitroff
                                  ------------------------------
                                  Name: Andrea Mitroff
                                  Its:  Assistant Portfolio Manager

                                       16
<PAGE>

                              INVESTOR: LAWRENCE OFFSHORE PARTNERS, LLC

                              By: /s/ Lawrence Garshofsky
                                  ------------------------------
                                  Name: Lawrence Garshofsky
                                  Its:  Manager

                              INVESTOR: LAWRENCE PARTNERS, LP

                              By: /s/ Lawrence Garshofsky
                                  ------------------------------
                                  Name: Lawrence Garshofsky
                                  Its:  Manager

                              INVESTOR: SUNOVA LONG-TERM OPPORTUNITY FUND, LP

                              By: /s/ Matthew Byrnes
                                  -------------------------------
                                  Name: Matthew Byrnes
                                  Its:  Managing Partner

                              INVESTOR: MALTA OFFSHORE, LTD
                                        SANDLER O'NEILL ASSET MANAGEMENT

                              By:  /s/ Terry Maltese
                                   ------------------------------
                                  Name: Terry Maltese
                                  Its:  President

                              INVESTOR: MALTA HEDGE FUND II, LP
                                        SANDLER O'NEILL ASSET MANAGEMENT

                              By:  /s/ Terry Maltese
                                   -------------------------------
                                  Name: Terry Maltese
                                  Its:  President

                              INVESTOR: MALTA HEDGE FUND, LP
                                        SANDLER O'NEILL ASSET MGMT

                              By:  /s/ Terry Maltese
                                   -------------------------------
                                  Name: Terry Maltese
                                  Its:  President

                                       17
<PAGE>

                              INVESTOR: MALTA PARTNERS II,LP
                                        SANDLER O'NEILL ASSET MGMT

                              By: /s/ Terry Maltese
                                  --------------------------------
                                  Name: Terry Maltese
                                  Its:  President

                              INVESTOR: MALTA PARTNERS, LP
                                        SANDLER O'NEILL ASSET MGMT

                              By: /s/ Terry Maltese
                                  --------------------------------
                                  Name: Terry Maltese
                                  Its:  President

                              INVESTOR: NORTHAVEN PARTNERS, L.P.

                              By: /s/ Paul Burke
                                  --------------------------------
                                  Name: Paul Burke
                                  Its:  Member of General Partner

                              INVESTOR: NORTHAVEN PARTNERS II, L.P.

                              By: /s/ Paul Burke
                                  --------------------------------
                                  Name: Paul Burke
                                  Its:  Member of GP

                              INVESTOR: NORTHAVEN PARTNERS III,L.P.

                              By: /s/ Paul Burke
                                  --------------------------------
                                  Name: Paul Burke
                                  Its:  Member of GP

                              INVESTOR: BANC FUND V, L.P.

                              By: /s/ Charles J. Moore
                                  ---------------------------------
                                  Name: Charles J. Moore
                                  Its:  Member

                                       18
<PAGE>

                              INVESTOR: BANK FUND III TRUST

                              By: /s/ Charles J. Moore
                                  ---------------------------------
                                  Name: Charles J. Moore
                                  Its:  Member

                              INVESTOR: BANC FUND III, L.P.

                              By: /s/ Charles J. Moore
                                  --------------------------------
                                  Name: Charles J. Moore
                                  Its:  Member

                              INVESTOR: MUTUAL FINANCIAL SERVICES FUND

                              By: /s/ Raymond Garea
                                  ---------------------------------
                                  Name: Raymond Garea
                                  Its:  Senior Vice President

                              INVESTOR: NICHOLAS-APPLEGATE PACIFIC
                                        CENTURY TRUST #2 SMALL

                              By: /s/ Scott A. Long
                                  ---------------------------------
                                  Name: Scott A. Long
                                  Its:  Head of Global Operations

                              INVESTOR: NICHOLAS-APPLEGATE SMALL CAP VALUE

                              By: /s/ Scott A. Long
                                  ---------------------------------
                                  Name: Scott A. Long
                                  Its:  Head of Global Operations

                              INVESTOR: NICHOLAS-APPLEGATE CORNERSTONE/SHEPERD
                                        VALUE

                              By: /s/ Scott A. Long
                                  ---------------------------------
                                  Name: Scott A. Long
                                  Its:  Head of Global Operations

                                      19<PAGE>

                                                                    EXHIBIT 10.1

                      CDPD VALUE ADDED RESELLER AGREEMENT

  This CDPD Value Added Reseller Agreement (this "Agreement"), dated as of
September 30th, 1997, is made between AT&T Wireless Data, Inc., a Delaware
corporation doing business as AT&T Wireless Services, for cellular digital
packet data ("CDPD") communications service (defined below) provided by AT&T
Wireless Data, Inc., d/b/a AT&T Wireless Services and its Affiliates,
collectively, ("AT&T"), and Vectorlink, Inc., a corporation organized under the
laws of the State of California, for itself and on behalf of its Affiliates (as
defined below) and any permitted assignee (collectively, "Customer").

                                   RECITALS

     A.    Customer would like to receive Service from AT&T, in connection with
Customer's provision of certain value-added communications services to its End
Users.

     B.    AT&T wishes to provide Service to Customer based upon the value-added
communications services provided by Customer to its End Users, in accordance
with the terms and conditions of this Agreement.

                                  AGREEMENTS

     In consideration of the mutual promises contained in this Agreement, the
Parties hereby agree as follows:

Section 1. Definitions

     1.1   Affiliate means, with respect to any entity, any other entity that
directly Controls, is Controlled by or is under common Control with the first
entity.

     1.2   Application means the combination of the Service and Customer's
value-added communications services provided to its End Users. The Application
is more specifically described in Exhibit A hereto.

     1.3   Control (and all conjugations thereof) means, with respect to any
entity, the direct or indirect possession of the power to direct the management
and policies of such entity.

     1.4   Customer Equipment means all equipment (other than equipment
comprising portions of AT&T's CDPD network) necessary to enable Customer or its
End Users to receive the Service.

     1.5   End User means the individuals or entities obtaining access to
Service from Customer.

                          CONFIDENTIAL & PROPRIETARY                      Page 1

CONFIDENTIAL TREATMENT REQUESTED. CONFIDENTIAL PORTIONS OF THIS DOCUMENT HAVE
BEEN REDACTED AND HAVE BEEN SEPARATELY FILED WITH THE COMMISSION.
<PAGE>

     1.6   Number means, for each End User, the AT&T network and service
identifier numbers and various other network, equipment and service numbers
assigned to Customer for that End User to obtain access to Service.

     1.7   Service means the CDPD communication service and associated support
services provided to Customer by AT&T.

     1.8   Service Area means those portions of AT&T's CDPD operating areas as
identified by AT&T from time to time (the "Service Area") and as set forth in
Exhibit B hereto, as amended from time to time.

Section 2. The Service

     2.1   Provision

               2.1.1  Service is available within the Service Area as long as
the Customer Equipment is turned on and programmed with AT&T network and service
identifier numbers (collectively, the "Numbers").

               2.1.2  Service provided pursuant to this Agreement will be
provided only upon the request of Customer's authorized representatives, and not
by End Users, and only in connection with the Application.

               2.1.3  Customer is not authorized under this Agreement to use the
Service independent of the Application or in conjunction with any other
Application unless such Application is described in and attached to Exhibit A
hereto.

     2.2   Support Services. AT&T will provide to Customer, and not directly to
End Users, network monitoring, technical assistance and trouble-shooting support
of the Service through AT&T'S technical assistance center (the "ATAC"). The ATAC
will be staffed and available to Customer's authorized representatives twenty-
four (24) hours per day, seven (7) days per week to perform these functions and
to address Customer's inquiries. Customer will provide AT&T with access to
contacts and dispatch information to facilitate appropriate response to Service
interruptions.

     2.3   Numbers. Customer shall be issued an initial amount of Numbers as set
forth in the Service Plan attached as Exhibit C hereto. Customer may order
additional Numbers by completing an NEI Request Form, a sample of which is
attached as Exhibit E. Additional Numbers will be issued to Customer provided
Customer is not in default hereof, and subject to any requirements for a
security deposit. AT&T may change any of Customer's Numbers from time to time,
by giving Customer written notice thereof. AT&T will, whenever possible, give
Customer prior written notice of such change. AT&T will use its best efforts to
minimize such changes. Customer will inform its End Users of the provisions of
this Section and agrees that neither it nor its End Users will acquire any
proprietary right in any specific Number provided by AT&T.

                          CONFIDENTIAL & PROPRIETARY                      Page 2
<PAGE>

     2.4  Use

          2.4.1  Customer will use the Service only for lawful business purposes
and only in connection with the Application, and may resell the Service only in
connection with the Application and as provided by this Agreement.

          2.4.2  AT&T authorizes Customer to provide any or all of the Service
to End Users in connection with End Users' use of the Application.

          2.4.3  AT&T is obligated only to Customer, with which it is in privity
of contract, and not to End Users, with whom AT&T is not in privity. End Users
are not to be deemed third-party beneficiaries of this Agreement.

          2.4.4  Customer is solely responsible for all risks and expenses
incurred with its actions or omissions in the provision of the Service or the
provision of the Application to End Users, including but not limited to payment
to AT&T for all charges for Service used by Customer or its End Users or third
Parties using a Number assigned to Customer. In connection with such activities,
Customer will act in all respects for its own account and will be responsible
for such things as credit verification, deposits, billing, collection, bad debts
and any unauthorized use of the Service by End Users or any third Party using a
Number assigned to Customer.

          2.4.5  Customer will disclose to End Users the provisions set forth in
Exhibit D.

          2.4.6  Customer is responsible for all End User support regarding all
aspects of End Users' use of the Service (whether arising in connection with
hardware, software or Service), including but not limited to issues relating to
modems, protocol stacks, software configuration and setup, usability issues,
Service activation, Service coverage, billing, and any and all other aspects of
technical services and customer care. This includes, but is not limited to,
Customer taking the End Users' calls and using reasonable commercial efforts to
remedy any Customer or End User-identified problem without AT&T's participation.
Customer will report a problem to AT&T only upon reasonable verification that
the problem is due to reasons other than misuse, malfunction or the failure of
the Customer Equipment to meet the technical standards for compatibility with
the Service, or failure of the End User to understand how to use the Service.

          2.4.7  The Service will not be used to transmit any communication
where the message, or its transmission or distribution would violate any local
court order or regulation or would likely be offensive to the recipient or
recipients thereof.

                          CONFIDENTIAL & PROPRIETARY                      Page 3
<PAGE>

     2.5  Continuing Right. AT&T will have the continuing right to market and
sell the service and any other communications services to any third Parties,
including but not limited to current, future and potential End Users of
Customer.

     2.6  Procedures. Customer will comply with AT&T's procedures for obtaining
Numbers and for activating Service with respect to any End User. AT&T may from
time to time modify these procedures by giving Customer written notice of such
modification.

     2.7  Service Area. The Service is available only within the Service Area
and is subject to (a) transmission limitations caused by atmospheric,
topographical or other conditions affecting transmission, (b) equipment
modifications, repairs and other similar activities necessary for the proper or
improved operation of the Service, and (c) equipment failures beyond AT&T's
reasonable control. AT&T will not be responsible for any interruption or
inability to use the Service that results from equipment or systems used in
connection with the Service or the Application. AT&T may amend Exhibit B to add
or delete any portion of the Service Area from time to time by giving written
notice to Customer.

     2.8  Interruptions and Field Trials. The Service may be temporarily
refused, limited, interrupted or curtailed due to governmental regulations or
orders, system capacity limitations or equipment maintenance, repair,
modifications, upgrades or relocation. AT&T will attempt to notify Customer of
scheduled and unscheduled network outages that are expected to last more than
four (4) hours and that may affect the Service. Customer will cooperate, at
AT&T's expense, in conducting any field tests and trials that AT&T or any
Service provider reasonably determines are necessary or desirable to ensure the
performance and reliability of the Service.

Section 3.  Interconnection

     Customer will be required to obtain and pay for any interconnection
services required to connect Customer to AT&T's CDPD network to be used by End
Users. In the event that individual connectivity to End Users is required,
Customer will follow AT&T policies and procedures for such connections.

Section 4.  Customer Equipment

     Customer will be responsible for the acquisition, programming,
installation, maintenance and repair of all Customer Equipment. Customer will
ensure that all Customer Equipment is technically and operationally compatible
with the Service and meets all applicable federal and state laws, rules and
regulations.

Section 5.  Rates

     5.1  Customer will pay AT&T for Service provided to Customer and its End
Users in accordance with the Service Plan. Unless the Service Plan provides
otherwise, AT&T may increase the rates contained in the Service Plan from time
to time on sixty

                          CONFIDENTIAL & PROPRIETARY                      Page 4
<PAGE>

days (60) written notice to Customer; provided, however, if such increase is
unacceptable to Customer, Customer may terminate this Agreement by providing
AT&T with written notice at least thirty (30) days in advance of such
termination. AT&T may decrease the rates contained in the Service Plan from time
to time upon written notice to Customer, effective on the date specified on such
notice.

     5.2  Customer may obtain any rate that is available to a similarly situated
reseller of AT&T. Customer may at any time notify AT&T that it chooses to obtain
Service under a different Rate Sheet, provided that AT&T may, upon receipt of
notice of Customer's election, either revise Exhibit C to reflect such election
or terminate this Agreement and offer Customer a new agreement.

Section 6.  Invoices, Payments, Taxes and Security Deposits

     6.1  Invoices. AT&T will provide Customer written invoices on a monthly
basis.

     6.2  Payment. Customer will pay each invoice within thirty (30) days
following its receipt thereof. Any payment not received by the due date will
accrue interest at the rate of one and one-half percent (1.5%) per month or the
maximum lawful rate. Additional fees will be assessed for any check returned for
insufficient funds.

     6.3. Disputed Charges. Should Customer reasonably dispute any portion of a
bill, it shall timely pay the undisputed amount. Customer shall 1) notify AT&T
in writing within fifteen (15) business days of receipt of a bill that Customer
disputes certain charges, 2) advise AT&T of the basis of its dispute and 3)
provide AT&T with such documentation as it may have to support its position.
Within fifteen (15) business days thereafter, AT&T shall provide Customer with a
written response supported by documentation. If AT&T's response indicates a
continuing dispute, within five (5) business days thereafter, Customer and AT&T
shall meet in a good faith effort to resolve the billing dispute. Both parties
agree that any claims or disputes under this Agreement will be submitted to non-
binding mediation prior to initiation of any formal legal process. Costs of
mediation will be shared equally.

     6.4  Taxes. Customer will pay all applicable federal, state and local
sales, use, public utilities, gross receipts or other taxes or fees imposed on
AT&T as a result of this Agreement (other than taxes imposed on the net income
of AT&T). Customer will submit certificates of resale for federal excise tax and
as required for the states in which it will resell service, as indicated on
Exhibit C. Customer will reimburse AT&T for any such taxes or fees paid by AT&T
on Customer's behalf.

     6.5  Security Deposits. AT&T may from time to time require Customer to
provide it with a cash deposit, irrevocable letter of credit, or other security
acceptable to AT&T based upon AT&T's assessment of Customer's creditworthiness.

                          CONFIDENTIAL & PROPRIETARY                      Page 5
<PAGE>

Section 7.  Term and Termination

     7.1  Term. The initial term of this Agreement will begin on the date hereof
and, unless earlier terminated in accordance with this Section 7, will continue
for a three (3) year term. This Agreement will automatically renew for
successive one-year renewal terms unless either Party, at least ninety (90) days
prior to the end of the then-current term, notifies the other Party in writing
of its intent to terminate this Agreement.

     7.2  Termination

          7.2.1  If either Party breaches a material term of this Agreement, and
such Party fails to cure the breach within thirty (30) days following its
receipt of written notice from the non-breaching Party (or ten days in the event
of non-payment of any amounts due hereunder), then the non-breaching Party, in
addition to any other remedies it may have at law or in equity, may terminate
this Agreement upon written notice to the breaching Party.

          7.2.2  This Agreement will automatically terminate in the event of
either Party's dissolution, insolvency, assignment for the benefit of creditors
or filing for relief under the provisions of the bankruptcy laws or similar
creditor protection laws.

          7.2.3  AT&T may terminate this Agreement immediately and without
penalty upon written notice to Customer if the Federal Communications Commission
or any other regulatory agency or court promulgates any rule, regulation,
judgment or order that (a) prohibits or substantially impedes (in effect or
application) AT&T from fulfilling its obligations hereunder or (b) adversely
affects AT&T's ability to conduct business upon terms and conditions acceptable
to it. AT&T will notify Customer promptly following AT&T's determination that an
event permitting termination under this Section has occurred.

          7.2.4  If Customer shall at any time fail to meet the Service Plan
requirements set forth in Exhibit C, AT&T may provide Customer with ninety (90)
days written notice either 1) that Customer is no longer eligible to receive
Service under this Agreement, or 2) that AT&T will modify the Service Plan in
accordance with Customer's actual usage. If Customer is unable, during the sixty
(60) day period after AT&T's notice is sent, to satisfy the eligibility
criteria, AT&T and Customer will renegotiate the Service Plan Requirements. If
the parties fail to reach a mutually acceptable agreement regarding the Service
Plan within the following thirty (30) day period, AT&T may either, immediately
or upon notice to Customer, 1) modify the Service Plan, or 2) terminate this
Agreement without further notice, in its sole discretion.

          7.3  Survival. Sections 8, 9, 10, 11, 12, 16 and 17 (together with all
other provisions of this Agreement that may reasonably be interpreted or
construed as surviving termination) will survive the termination of this
Agreement.

          7.4 Payment upon Termination. Upon termination of this Agreement for
any reason, all amounts owing to AT&T hereunder will become due and payable.

                          CONFIDENTIAL & PROPRIETARY                      Page 6
<PAGE>

Section 8.  Force Majeure

       Neither Party will be liable for any loss, damage, cost, delay or failure
to perform resulting from causes beyond its reasonable control including, but
not limited to, acts of God, fires, floods, earthquakes, strikes, insurrections,
riots, lightening or storms, or delays of suppliers or subcontractors for the
same causes.

Section 9.  Indemnification

       9.1  MUTUAL INDEMNITY. EACH PARTY WILL DEFEND, INDEMNIFY AND HOLD THE
OTHER, THE OTHER'S SUBSIDIARIES AND AFFILIATES (AND THEIR RESPECTIVE OWNERS,
DIRECTORS, OFFICERS, EMPLOYEES, REPRESENTATIVES AND AGENTS) AND ANY UNDERLYING
CARRIER ENABLING THE PROVISION OF SERVICE HARMLESS AGAINST ANY DAMAGES, LOSSES
AND EXPENSES (INCLUDING REASONABLE ATTORNEYS' AND EXPERT WITNESS' FEES AND
DISBURSEMENTS, WHETHER AT TRIAL OR ON ANY APPEAL) ARISING OUT OF OR RELATING TO
ANY CLAIMS, ACTIONS OR OTHER PROCEEDINGS THAT (A) ARE BROUGHT BY OR ON BEHALF OF
ANY THIRD PARTY, AND (B) RESULT FROM THE INDEMNIFYING PARTY'S BREACH, FAILURE TO
PERFORM, OR MISCONDUCT IN CONNECTION WITH ITS DUTIES OR THE EXERCISE OF ITS
RIGHTS UNDER THIS AGREEMENT.

       9.2  ADDITIONAL INDEMNITY. CUSTOMER FURTHER AGREES TO DEFEND, INDEMNIFY
AND HOLD AT&T, ITS SUBSIDIARIES AND AFFILIATES, THEIR RESPECTIVE OWNERS,
DIRECTORS, OFFICERS, EMPLOYEES, REPRESENTATIVES AND AGENTS AND ANY UNDERLYING
CARRIER ENABLING THE PROVISION OF SERVICE (COLLECTIVELY, AS USED IN THIS
SUBPARAGRAPH, "AT&T") HARMLESS AGAINST ANY DAMAGES, LOSSES AND EXPENSES
(INCLUDING REASONABLE ATTORNEYS' AND EXPERT WITNESS' FEES AND DISBURSEMENTS,
WHETHER AT TRIAL OR ON ANY APPEAL) ARISING OUT OF OR RELATING TO ANY CLAIMS,
ACTIONS OR OTHER PROCEEDINGS THAT ARE BROUGHT BY OR ON BEHALF OF END USERS;
PROVIDED THAT CUSTOMER'S OBLIGATIONS TO DEFEND, INDEMNIFY AND HOLD AT&T HARMLESS
WILL NOT APPLY TO THE EXTENT THE CLAIM, ACTION OR PROCEEDING RESULTS FROM AT&T'S
GROSS NEGLIGENCE OR WILLFUL MISCONDUCT.

Section 10. No Warranties

       AT&T SUPPLIES A SERVICE, AND NOT GOODS. AT&T MAKES NO WARRANTIES, EXPRESS
OR IMPLIED, WITH RESPECT TO THE SERVICE OR THE PERFORMANCE OF ANY OBLIGATIONS
HEREUNDER INCLUDING, WITHOUT LIMITATION, WARRANTIES OF MERCHANTABILITY OR
FITNESS FOR A PARTICULAR PURPOSE. ALL SUCH WARRANTIES ARE EXPRESSLY EXCLUDED.
AT&T IS NOT THE MANUFACTURER OF ANY CUSTOMER

                          CONFIDENTIAL & PROPRIETARY                    Page 7

<PAGE>

EQUIPMENT AND MAKES NO WARRANTIES, EXPRESS OR IMPLIED, WITH RESPECT THERETO. TO
THE EXTENT AT&T PROVIDES ACCESS TO INFORMATION PROVIDED BY OTHER SOURCES, AT&T
ACCEPTS NO LIABILITY FOR AND MAKES NO WARRANTIES, EXPRESS OR IMPLIED, WITH
RESPECT TO THE CONTENT THEREOF.

Section 11.  Limitation of Liability

     11.1    NO CONSEQUENTIAL DAMAGES. NEITHER PARTY WILL BE LIABLE TO THE OTHER
(OR ITS END USERS, CUSTOMERS OR ANY THIRD PARTY) FOR ANY INDIRECT, INCIDENTAL OR
CONSEQUENTIAL DAMAGES ARISING OUT OF SUCH PARTY'S FAILURE TO PERFORM UNDER THIS
AGREEMENT. NOTHING IN THIS SECTION 11.1 WILL LIMIT A PARTY'S OBLIGATION TO FULLY
INDEMNIFY THE OTHER UNDER SECTION 9 FOR ACTIONS BROUGHT BY THE INDEMNIFYING
PARTY'S CUSTOMERS, END USERS OR BY ANY THIRD-PARTY, EVEN IF SUCH ACTIONS INCLUDE
CLAIMS FOR INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES.

     11.2    LIMITATION OF ACTIONS. EXCEPT FOR ACTIONS ARISING IN CONNECTION
WITH SECTION 9, NEITHER PARTY MAY BRING A LEGAL ACTION WITH RESPECT TO THIS
AGREEMENT MORE THAN TWENTY-FOUR (24) MONTHS AFTER THE CAUSE OF ACTION ACCRUES.

     11.3    LIABILITY CAP. EXCEPT FOR LIABILITIES ARISING UNDER SECTION 9, THE
AGGREGATE LIABILITY OF AT&T TO CUSTOMER FOR CLAIMS RELATING TO THIS AGREEMENT,
WHETHER FOR BREACH OR IN TORT, WILL NOT EXCEED THE AMOUNT PAID BY CUSTOMER TO
AT&T IN THE TWO MONTH PERIOD PROCEEDING THE DATE THE CLAIM AROSE.

     11.4    PARTY. FOR THE PURPOSES OF THIS SECTION 11, "PARTY" MEANS THE
PARTY, ITS SUBSIDIARIES AND AFFILIATES AND THEIR RESPECTIVE OWNERS DIRECTORS,
OFFICERS, EMPLOYEES, AGENTS, REPRESENTATIVES, SUBCONTRACTORS AND SUPPLIERS.

     11.5    SECURITY. ALTHOUGH THE SERVICE USES AN ENCRYPTED TECHNOLOGY, AND
THE LAW GENERALLY PROHIBITS THIRD PARTIES FROM MONITORING CELLULAR
TRANSMISSIONS, AT&T CANNOT GUARANTY THE SECURITY OF DATA TRANSMISSIONS. AT&T
SHALL NOT BE LIABLE FOR ANY LACK OF SECURITY RELATING IN ANY WAY TO USE OF THE
SERVICE OR CUSTOMER'S OR ITS END USERS DATA TRANSMISSIONS.

Section 12.  Confidentiality

     12.1    Confidential Information. As used in this Agreement, "Confidential
Information" means any information of either AT&T or Customer that is not
generally known to the public, whether of a technical, business or other nature
(including, but not

                          CONFIDENTIAL & PROPRIETARY                    Page 8

<PAGE>

necessarily limited to, trade secrets, know-how and information relating to the
technology, customers, business plans, promotional and marketing activities,
finances and other business affairs of such Party). AT&T's Confidential
Information includes, among other things, the rates, terms and conditions
relating to AT&T's provision of Service to Customer.

     12.2   Use and Disclosure. In the performance of or otherwise in connection
with this Agreement, any Party (the "Receiving Party") may receive certain
Confidential Information of the other Party (the "Disclosing Party"). The
Receiving Party, except as expressly provided in this Agreement, will not
disclose such Confidential Information to anyone without the Disclosing Party's
prior written consent. The Receiving Party will not use, or permit others to
use, Confidential Information for any purpose other than the purpose for which
it was disclosed. The Receiving Party will take all reasonable measures to avoid
disclosure, dissemination or unauthorized use of Confidential Information,
including, at a minimum, those measures it takes to protect its own confidential
information of a similar nature.

     12.3   Exceptions. The provisions of Section 12.2 will not apply to any
information that (a) is or becomes publicly available without breach of this
Agreement, (b) can be shown by documentation to have been known to the Receiving
Party at the time of its receipt from the Disclosing Party, (c) is rightfully
received from a third Party who did not acquire or disclose such information by
a wrongful or tortious act, or (d) can be shown by documentation to have been
independently developed by the Receiving Party without reference to any
Confidential Information.

     12.4   Disclosure to Governmental Entities. If the Receiving Party becomes
legally obligated to disclose Confidential Information to any governmental
entity with jurisdiction over it, the Receiving Party will give the Disclosing
Party prompt written notice sufficient to allow the Disclosing Party to seek a
protective order or other appropriate remedy. The Receiving Party will disclose
only such information as is required by the governmental entity and will use its
reasonable best efforts to obtain confidential treatment for any Confidential
Information that is so disclosed.

     12.5   Ownership; Return. All Confidential Information will remain the
exclusive property of the Disclosing Party, and the Receiving Party will have no
rights, by license or otherwise, to use the Confidential Information except as
expressly provided herein. The Receiving Party promptly will return or destroy
all tangible material embodying Confidential Information (in any form and
including, without limitation, all summaries, copies and excerpts of
Confidential Information) upon the earlier of (a) the completion or termination
of the dealings between the Disclosing Party and the Receiving Party, and (b)
the Disclosing Party's written request.

                          CONFIDENTIAL & PROPRIETARY                    Page 9

<PAGE>

Section 13.  Notices

     All notices and other communications relating to this Agreement will be
made in writing and will be deemed to have been duly delivered, effective upon
receipt, if sent to the address set forth below each Party's signature.

Section 14.  Assignment

     Except as provided in this Section 14, neither Party may assign or transfer
this Agreement, or its rights or obligations hereunder, without the prior
written consent of the other Party. Either Party may assign this Agreement,
without the other's consent, to (a) any Affiliate of the assignor, or (b) any
person or entity that acquires the assignor or substantially all of the
assignor's business through any merger, consolidation or stock or asset
purchase; provided that the assignee agrees in writing to be bound by the
provisions of this Agreement. In addition, AT&T may assign certain of its rights
and obligations under this Agreement without Customer's consent.

Section 15.  No Agency

     AT&T and Customer are independent contracting Parties. This Agreement does
not create any partnership, joint venture or agency relationship between the
Parties.

Section 16.  Marks

             16.1  Customer recognizes the right, title and interest of AT&T,
the CDPD Systems and their respective Affiliates in and to all service marks,
trademarks and trade names used by any of them in connection with the Service
(the "Marks"). Customer will not gain any rights to the Marks by virtue of this
Agreement and will not use any Marks without AT&T's prior written consent.

             16.2  In all dealings with each other, End Users and third parties,
Customer and AT&T will be governed by the highest standards of honesty,
integrity, fair dealing and ethical conduct. Neither Party will engage in any
activity that may be harmful to the other Party's goodwill or may reflect
unfavorably on its marks, this prohibition includes, without limitation, the
commission of any unfair trade practice, the publication of any false,
misleading or deceptive advertising, or the commission of any fraud or
misrepresentation. Any breach of this provision shall give rise to termination
under section 7.2.1

Section 17.  General

     17.1    State law/venue. This Agreement will be governed by the laws of the
State of Washington, without reference to its choice of law rules. Any
proceeding to enforce any rights or obligations hereunder shall be brought in
King County, Washington.

     17.2    Attorneys' fees. In the event an action is commenced by either
Party to enforce the terms of this Agreement, the substantially prevailing Party
in such action shall

                          CONFIDENTIAL & PROPRIETARY                     Page 10

<PAGE>

be entitled to its reasonable costs and attorneys' and expert witness' fees
incurred therein and on any appeal thereof.

     17.3   Entire agreement. This Agreement, together with its attached
Exhibits, sets forth the entire agreement between the Parties concerning the
subject matter hereof. Any amendment or modification to this Agreement will be
effective only if made in writing and signed by both Parties. Provided, however,
this Agreement shall be deemed automatically amended to the extent inconsistent
with any federal, state or local law, regulation, court order or tariff required
to be filed by AT&T.

     17.4   Waiver. The waiver of any provision or default of this Agreement
will not constitute a waiver of any other provision or default. If any provision
of this Agreement is deemed to be unenforceable, the remaining provisions will
remain in full force and effect.

     17.5   Compliance with laws. AT&T and Customer shall at all times comply in
all material respects with all laws, rules and regulations applicable to the
performance of this Agreement.

The Parties have executed this Agreement on the date first above written.

Vectorlink, Inc.                        AT&T Wireless Data, Inc.
                                        d/b/a AT&T Wireless Services

By:   /s/ Amin Mufti                    By:   /s/ Kendra Van der Meulen
    -----------------------                ------------------------------
Title: VP Business Development          Title:        SVP & GM
       -----------------------                ---------------------------

Address: 41638 Christy Street           Address: 10230 N.E. Points Dr.
         Fremont, CA 94538                       Kirkland, Washington 98033
                                                 Attn: Andy Willett
         Attn: Amin Mufti                        (With copy to General Counsel)

                          CONFIDENTIAL & PROPRIETARY                     Page 11

<PAGE>

                                   EXHIBIT A

                                  Application

Customer provides and Automatic Vehicle Location (AVL) and Dispatch service to
businesses via the Internet. The purpose of this solution is to allow companies
to know the location of all vehicles in their fleet in real time. This allows
companies to make more efficient fleet management decisions.

End Users using the Customer solution track their vehicles by utilizing the
Internet. The application which tracts the vehicles actually resides on a server
at Customer's location. To get access to this server the End User would need to
have an Internet connection and some type of Internet browser such as Netscape.
The End User would then be given a password which would provide access to a
private page on the Customer web site. This page would contain the tracking and
dispatch application.

A GPS/CDPD unit is installed in the trunk of the vehicle to be tracked.
Optionally, the customer can choose the dispatch feature which provides and LCD
display that resides near the driver. The vehicle is periodically polled for its
location. The End User predefines how often a vehicle is polled based on
business requirements. The GPS unit provides the exact longitude and latitude of
the vehicle at the time of being polled. The CDPD modem then sends that data to
the AT&T CDPD network, which is then passed through the Internet to the Customer
server where the customer can view the plotted and mapped data via the web. The
application provides the exact location of the vehicle, a history of the routes
the vehicle has traveled, how fast the vehicle is traveling, etc. The End User
can also send dispatch messages to the driver of the vehicle using the same
wireless communications link. The driver can optionally respond to these
messages by using the keypad located on the LCD display.

Customer provides a turn-key solution to the End User which includes the
GPS/CDPD hardware, web based application software, AT&T network services,
installation and ongoing support. The web based tracking solution is provided on
a monthly subscription basis which includes a pre-determined amount of wireless
data usage. This amount will vary and is determined by the polling frequency
chosen by the End User. The End User may either purchase the GPS/CDPD modem or
have it added as part of the monthly subscription fee. The Customer server can
host multiple customers, each having their own private web page.

                          CONFIDENTIAL & PROPRIETARY                     Page 12
<PAGE>

                                   EXHIBIT B

                                 Service Area

Customer is authorized to provide the Service in the following MSAs:

Arizona:         Phoenix*, Tucson*
--------
California:      Fresno, Sacramento, San Diego*, San Francisco*, San Jose*,
-----------
                 Bakersfield*

Colorado:        Denver
---------
Connecticut:     Bridgeport*, Hartford*, New Haven*, New London/Norwich*
------------
Delaware:        Wilmington*, Dover*
---------
Florida:         Orlando, Tampa/St. Petersburg, West Palm Beach/Boca Raton
--------
                 Miami/Ft. Lauderdale, Lakeland/Winter Haven*

Illinois:        Chicago*
---------
Indiana:         Gary*, Indianapolis*
--------
Kentucky:        Louisville*
---------
Maryland:        Baltimore*, Frederick*
---------
Massachusetts:   Boston*, Worcester*
--------------
Michigan:        Detroit*
---------
Minnesota:       Minneapolis/St. Paul
----------
Missouri:        St. Louis*
---------
Nevada:          Las Vegas, Reno
-------
New Hampshire:   Manchester*
--------------
New Jersey:      Atlantic City*, Trenton*, Long Branch*, New Brunswick*, Ocean
-----------
                 City*, Vineland

New Mexico:      Albuquerque*, Las Cruces*
-----------
New York:        New York
---------
North Carolina:  Charlotte*, Raleigh*
---------------
Ohio:            Cincinnati*, Columbus*, Dayton*, Cleveland*, Akron*, Canton*
-----
Oklahoma:        Oklahoma City, Tulsa
---------
Oregon:          Portland
-------
Pennsylvania:    Pittsburgh, Allentown*, Philadelphia*
-------------
South Carolina:  Columbia*, Greenville*
---------------
Tennessee:       Memphis*, Nashville*
----------

                          CONFIDENTIAL & PROPRIETARY                     Page 13
<PAGE>

Texas:           Austin, Dallas/Ft. Worth, San Antonio, El Paso*, Houston*,
------
                 Galveston*

Utah:            Salt Lake City
-----
Virginia:        Newport News*, Richmond*, Norfolk*
---------
Washington:      Seattle/Everett, Tacoma
-----------
Washington D.C.*
----------------

* These markets are available for Service through an intercarrier arrangement.

                          CONFIDENTIAL & PROPRIETARY                     Page 14
<PAGE>

                                   EXHIBIT C

                                 Service Plan

Certificates of Resale provided for the following:
-------------------------------------------------
     Federal Excise Tax; and
     States: California

Interconnection: Internet
---------------

                                 Definitions:
                                 -----------

AT&T Markets: Markets where AT&T operate wireless IP service, as indicated on
------------
Exhibit B.

Non AT&T Markets: Markets where Wireless IP service is available through AT&T's
----------------
intercarrier agreements, as indicated on Exhibit B.

UP.Link Gateway: Application layered gateway utilizing software provide by
---------------
Unwired Planet that provides protocol translation and proxy service to allow an
HDML device to communicate with HTML sites.

                           I. Standard VAR Rate Plan

Monthly Access Fee: [**] per Activated Number (not pro-rated).
------------------

Volume Discounts: As the volume of Customer's Numbers increases across all rate
----------------
plans, Customer will receive the following discounts.

--------------------------------------------------------------------------------
                     [**]                         [**]
--------------------------------------------------------------------------------
                     [**]                         [**]
--------------------------------------------------------------------------------
                     [**]                         [**]
--------------------------------------------------------------------------------
                     [**]                         [**]
--------------------------------------------------------------------------------
                     [**]                         [**]
--------------------------------------------------------------------------------

Usage Charges:
-------------
In AT&T Markets:        [**] per kilobyte*
In non-AT&T Markets:    [**] per kilobyte

*Usage in AT&T markets during off-peak hours (weekends and from 7 p.m. to 7
a.m., Monday through Friday) qualify for a [**] discount.

** CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.

<PAGE>

                             II. Bucket Rate Plans

B30 Rate Plan.  [**] per Number per month for [**] kilobytes of average* usage
-------------
in AT&T's market. Any usage above the [**] kilobytes average or usage in non-
AT&T markets will be billed at [**] per kilobyte without exception.

B35 Rate Plan.  [**] per Number per month for [**] kilobytes of average* usage
-------------
in AT&T's market. Any usage above the [**] kilobytes average or usage in non-
AT&T markets will be billed at [**] per kilobyte without exception.

B40 Rate Plan.  [**] per Number per month for [**] kilobytes of average* usage
-------------
in AT&T's market. Any usage above the [**] kilobytes average or usage in non-
AT&T markets will be billed at [**] per kilobyte without exception.

*To determine average usage, AT&T will aggregate usage across all of the Numbers
in a particular Bucket Rate Plan.

                        III. Unlimited Usage Rate Plans

Limitations:  To qualify for an Unlimited Usage Rate Plan, the Service address
------------
of the End User using the service must be in an AT&T Market.

Local Unlimited VAR (LUV): [**] per Number per month for unlimited usage in
-------------------------
AT&T markets. Any usage in non-AT&T markets will be billed at [**] per kilobyte
without exception.

National Unlimited VAR (NUV).  [**] per Number per month for unlimited usage
---------------------------
wherever Wireless IP Service is offered, whether in AT&T markets or non AT&T
markets.

Volume Discounts:  As the volume of Customer's Numbers increases within these
----------------
rate plans, Customer will receive the following discounts.

<TABLE>
<CAPTION>
-------------------------------------------------------------------------------
               # of Active IPs             Volume Discount*
-------------------------------------------------------------------------------
                                      LUV                    NUV
-------------------------------------------------------------------------------
               <S>                    <C>                    <C>
                      [**]            [**]                   [**]
-------------------------------------------------------------------------------
                      [**]            [**]                   [**]
-------------------------------------------------------------------------------
                      [**]            [**]                   [**]
-------------------------------------------------------------------------------
                      [**]            [**]                   [**]
-------------------------------------------------------------------------------
</TABLE>

  * Volume discounts only apply to monthly access fees and not on usage fees.

 ** CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.

<PAGE>

Rate Changes: Unlimited rates are fixed for an initial twelve months term
------------
following activation. Increases after the initial twelve month term will be
preceded by 90 days advance notice.

                  IV. PocketNet Unlimited VAR (PUV) Rate Plan

Limitations:  To qualify for the PUV Rate Plan, Customer must have an HDML based
-----------
application which is described more specifically in Exhibit A.

Customer can either utilize the Wireless Data Division's (WDD) UP.Link Gateway
or provide their own UP.Link Gateway.

 .    If Customer chooses to utilize the WDD UP.Link gateway, Customer must
     provide AT&T the URL address of their web server which will house the
     information viewable by the HDML data devices accessing this server.

 .    If Customer chooses to utilize their own UP.Link Gateway, Customer must
     provide AT&T the IP address of this UP.Link Gateway.

Pocketnet Unlimited VAR (PUV) Rate Plan:  [*] per Number per month for
---------------------------------------
unlimited usage in AT&T markets. Any usage in non-AT&T markets and any usage
that does not go through an UP.LINK gateway will be billed at [*] per kilobyte
without exception.

Volume Discounts: As the volume of Customer's Numbers increases within the PUV
----------------
rate plan, Customer will receive the following discounts.

--------------------------------------------------------------------------------
              # of Active IPs                       Monthly Price
--------------------------------------------------------------------------------
                   [*]                                  [*]
--------------------------------------------------------------------------------

                         V. VAR Government Rate Plans

Limitations: To qualify for a VAR Government Rate Plan, Customer must submit
-----------
satisfactory proof that the entity receiving service under the plan is a
government agency and that each End User is a member of that government agency.
AT&T will make all such determinations as to eligibility in its sole discretion.
In addition, the Service address of the End User using Service must be in an
AT&T market.

Government Unlimited VAR (GUV):  [*] per Number per month for unlimited usage
------------------------------
in AT&T markets. Any usage in non-AT&T markets will be charged at [*] per
kilobyte without exception.

* CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.
<PAGE>

Volume Discounts: As the volume of Customer's Numbers increases, Customer will
----------------
receive the following discounts.

--------------------------------------------------------------------------------
                   [**]                                   [**]
--------------------------------------------------------------------------------
                   [**]                                   [**]
--------------------------------------------------------------------------------
                   [**]                                   [**]
--------------------------------------------------------------------------------
  * Volume discounts only apply to monthly access fees and not on usage fees.

The following items apply for all VAR rate plans.

Reservation Fee: Customer may request a block of network addressess be reserved
---------------
to it prior to activation. AT&T will hold such addresses in a pool until
Customer requests activation. Customer will be charged [**] per month per
reserved, but not activated, Number. During any month in which a reserved Number
is activated, Customer will be charged only the applicable Access Fee plus any
applicable usage, and will not be charged a Reservation Fee.

Assignment Fee:  A one time fee of [**] will be charged for every new Number
--------------
at the earlier of the time of reservation or activation.

Cancellation Fee:  No cancellation fee will be assessed upon deactivation or
----------------
deassignment of Numbers.

Billing Guidelines for Calls under All Rate Plans.
-------------------------------------------------

     1.   General.  AT&T will bill Customer on a monthly basis for Service
          -------
          furnished under this Agreement, including regular monthly Service
          charges and usage charges for all data transmissions processed through
          the Number. Usage charges include charges on a per kilobyte basis for
          transmissions that are sent or received by Equipment programmed with a
          Number assigned to Customer. Usage charges may also include charges
          for additional services offered by AT&T which Customer may subscribe
          to at rates determined by AT&T from time to time.

     2.   Access Charges.  Access charges are billed monthly in arrears. Usage
          --------------
          charges are billed monthly in arrears. If AT&T agrees to provide
          Service features to Customer, AT&T reserves the right to charge a
          reasonable fee for adding or deleting Service features.

     3.   Measurement.  The measurement of a transmission is in kilobytes.
          -----------

     4.   Discounts.  All volume and off peak discounts will be applied to
          ---------
          Customer's Account for the current billing cycle.

** CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.

<PAGE>

     5.   Additional Charges:  State surcharges may be charged to Customer in
          ------------------
          addition to the charges under all Rate Plans.

     6.   Loss of Registration.  Registration may be "lost" (i.e., involuntarily
          --------------------
          disconnected) for a variety of reasons, including atmospheric
          conditions, topography, weak batteries, system over capacity, movement
          outside a service area, and gaps in coverage within a service area.
          Loss of registration may result in retransmissions and additional
          usage charges.

Minimum Number Requirements:
---------------------------
Customer shall maintain, within one year of the date of this Agreement, a
minimum of 500 active Numbers.

Failure to Meet Minimum Number Requirements:  In the event Customer fails to
-------------------------------------------
achieve the minimum Number requirements at any time after the dates set forth in
this Exhibit C, Customer shall pay to AT&T in addition to all other amounts due
the difference between Customer's actual Numbers and the required minimum
Numbers times the monthly access fee set forth in Exhibit C for each month in
which Customer fails to achieve such minimum. Continued failure to meet Minimum
Number Requirements shall give rise to AT&T's right to terminate under section
7.2

Promotional Tools:  AT&T will provide Customer with up to two Numbers, at no
-----------------
charge, with unlimited usage in AT&T markets, and up to [*] additional Numbers
at a rate of [*] per month, with unlimited usage in AT&T markets. Usage outside
of AT&T markets and all taxes on usage relating to such Numbers will remain the
responsibility of Customer.

* CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.
<PAGE>

                                   EXHIBIT D

                             End User Disclosures

1.   [END USER] EXPRESSLY UNDERSTANDS AND AGREES THAT IT HAS NO CONTRACTUAL
RELATIONSHIP WHATSOEVER WITH THE UNDERLYING WIRELESS SERVICE CARRIER AND THAT
[END USER] IS NOT A THIRD PARTY BENEFICIARY OF ANY AGREEMENT BETWEEN [CUSTOMER]
AND UNDERLYING CARRIER. IN ADDITION, [END USER] EXPRESSLY UNDERSTANDS AND AGREES
THAT THE UNDERLYING CARRIER SHALL HAVE NO LEGAL, EQUITABLE, OR OTHER LIABILITY
OF ANY KIND TO [END USER]. IN ANY EVENT, REGARDLESS OF THE FORM OF THE ACTION,
WHETHER FOR BREACH OF CONTRACT, WARRANTY, ENGLIGENCE STRICT LIABILITY IN TORT OR
OTHERWISE, [END USER's] EXCLUSIVE REMEDY AND THE TOTAL LIABILITY OF THE
UNDERLYING CARRIER ARISING IN ANY WAY IN CONNECTION WITH THIS AGREEMENT, FOR ANY
CAUSE WHATSOEVER, INCLUDING BUT NOT LIMITED TO ANY FAILURE OR DISRUPTION OF
SERVICE PROVIDED HEREUNDER, IS LIMITED TO PAYMENT OF DAMAGES IN AN AMOUNT EQUAL
TO THE PORTION OF THE MONTHLY CHARGES TO [END USER] FOR THE SERVICES RELATING TO
THE PERIOD OF SERVICE DURING WHICH SAID DAMAGES OCCUR.

2.   [END USER] SHALL INDEMNIFY AND HOLD HARMLESS THE UNDERLYING WIRELESS
SERVICE CARRIER SUPPLYING SERVICES TO [CUSTOMER] AND ITS OFFICERS, EMPLOYEES,
AND AGENTS AGAINST ANY AN ALL CLAIMS, INCLUDING WITHOUT LIMITATION CLAIMS FOR
LIBEL, SLANDER, OR ANY PROPERTY DAMAGE, PERSONAL INJURY OR DEATH, ARISING IN ANY
WAY DIRECTLY OR INDIRECTLY IN CONNECTION WITH THIS AGREEMENT OR THE USE, FAILURE
TO USE, OR INABILITY TO USE THE NUMBER EXCEPT WHERE THE CLAIMS RESULT FROM THE
UNDERLYING CARRIER'S GROSS NEGLIGENCE OR SILLFULL MISCONDUCT. THIS INDEMNITY
SHALL SURVIVE THE TERMINATION OF THE AGREEMENT.

3.   [END USER] HAS NO PROPERTY RIGHT IN ANY NUMBER ASSIGNED TO IT.

                      CONFIDENTIAL & PROPRIETARY                        Page 18

<PAGE>

                                   EXHIBIT E

                               NEI Request Form

                                   RESELLER
                                NEI ORDER FORM

                                                     Today's Date:  ____________

================================================================================
Account Name:  ________________________             Account #:  ____________
================================================================================

Requester Name:  _____________________________________________
Phone:  ________________                    Fax:  ___________________

List the associated NEI's or the number of requested NEI's and fax to: Wireless
Data Support at, (206) 803-4708.

------------------------------------------------------------------
Please Check the appropriate box for your request:
------------------------------------------------------------------
   Request an Allocation of NEIs     # of NEIs:  ____________
------------------------------------------------------------------
   Request for Activated NEIs:      # of NEIs:  ___________
------------------------------------------------------------------
   Request for Allocated NEIs to be Activated*
------------------------------------------------------------------
   Deactivate Designated NEIs and Move to Allocated*
------------------------------------------------------------------
   Deactivate Designated NEIs and Return to AT&T Wireless*
------------------------------------------------------------------
   Change Service Address of Designated NEIs*
------------------------------------------------------------------
   Change Rate Plan of Designated NEIs*
------------------------------------------------------------------
   Change EID of Designated NEIs*
------------------------------------------------------------------
* Indicates additional information required below

Associated NEI's:

<TABLE>
<CAPTION>
------------------------------------------------------------------
                                                        Secured (S)
                                                        Unsecured
                                 Service Address           (R)       Dealer #
    NEI:             EID:         City, State, Zip         NEI       (optional):
--------------------------------------------------------------------------------
<S>                  <C>         <C>                    <C>          <C>
--------------------------------------------------------------------------------

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

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

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

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

--------------------------------------------------------------------------------
</TABLE>

     ____________________________            ___________________
     Customer Care Representative               Date Completed

                      CONFIDENTIAL & PROPRIETARY                         Page 19

<PAGE>

                                               [LETTERHEAD OF AT&T APPEARS HERE]

August 28, 1998

Amin Mufti
Vectorlink
42638 Christy Street
Fremont, CA 94538

Dear Amin:

Enclosed you will find AT&T's revised Exhibit C. The purpose for the revision is
we have made some changes and additions to our rate plans. This version of the
Exhibit will supersede your existing Exhibit C and will become part of the
binding VAR Agreement you have with AT&T.

Please review this and if you have any questions please give me a call at (425)
803-4655.

Sincerely,

/s/ John M. Russell

John. M. Russell
National VAR Account Manager
AT&T Wireless Services

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