Document:

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                                                                   EXHIBIT 10.10

                           STOCK PURCHASE AGREEMENT
                           ------------------------

     AGREEMENT dated as of September 10, 1999 by and among PartMiner, Inc.,
f/k/a Dast Corporation, d/b/a Microcom Technologies, a New York corporation (the
"Company"), Elsevier Realty Information, Inc., a Delaware corporation (the
"Purchaser"), and Daniel Nissanoff (the "Stockholder").

                                 Introduction
                                 ------------

     Purchaser wishes to purchase an aggregate of 69,459 shares of the Company's
common stock, $.01 par value per share (the "Common Stock"), and the Company and
                                             ------------
Stockholder each wish to sell shares of the Common Stock to Purchaser.

     NOW, THEREFORE, in consideration of the mutual covenants and agreements
hereinafter set forth, and for other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the parties agree as
follows:

                                   ARTICLE I
                             PURCHASE AND SALE OF
                     COMMON STOCK; PURCHASE PRICE; CLOSING

     Section 1.01.  Purchase and Sale of Common Stock.  In reliance upon the
     ------------   ---------------------------------
representations and warranties contained herein, and subject to the terms and
conditions hereof, the Company agrees to issue and sell to Purchaser, and the
Stockholder agrees to sell to Purchaser, and Purchaser agrees to purchase from
the Company and the Stockholder, respectively, the number of shares of Common
Stock indicated on Schedule 1.01 hereto.
                   -------------

     Section 1.02.  Purchase Price.  The aggregate purchase price for the Common
     ------------   --------------
Stock shall be $15,000,000 (the "Purchase Price"), $10,000,000 to be paid to the
                                 --------------
Company and $5,000,000 to be paid to Stockholder, each sum payable by wire
transfer in immediately available funds to an account designated by each of the
Company and the Stockholder. The Purchase Price shall be payable at the Closing
(as hereinafter defined).

     Section 1.03.  Closing.  The purchase and sale of the Common Stock shall
     ------------   -------
take place at a closing (the "Closing") to be held at the offices of Purchaser
                              -------
at 275 Washington Street, Newton, Massachusetts, or such other place as is
agreed to by the parties, on September 9, 1999, or if the conditions to Closing
specified herein are not then satisfied or waived, such date which is five (5)
business days after the satisfaction or waiver of such conditions (the "Closing
                                                                        -------
Date").
-----

     Section 1.04.  Purchase Price Adjustment.  In the event that the Company
     ------------   -------------------------
completes a private financing within ninety (90) days of the Closing at a
valuation of the Company of less than $150 million, the Company will refund to
Purchaser $100,000 in cash for every $1,000,000 by which $150 million exceeds
the valuation of the Company used for the purposes of such financing
(appropriately adjusted for any valuation which is not equal to a multiple of

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$1,000,000).  The foregoing refund will be paid to Purchaser within ten (10)
days of the closing of such financing by wire transfer to an account designated
by Purchaser.  In addition, for a period of twelve (12) months from the Closing
Date, the Company shall not complete an initial public offering of the Company's
securities pursuant to a registration statement under the Act (as defined below)
at a valuation of the Company of less than $110,000,000, without the consent of
Purchaser, which consent shall not be unreasonably withheld or delayed.

                                  ARTICLE II
                 REPRESENTATIONS AND WARRANTIES OF THE COMPANY

     The Company represents and warrants to the Purchaser that the information
set forth in this Article II is true and correct as of the date hereof and will
be true and correct as of the Closing.

     Section 2.01.  Organization and Standing.  The Company is a corporation
     ------------   -------------------------
duly organized, validly existing and in good standing under the laws of the
State of New York.  The Company has all necessary corporate power and authority
to own its properties and to carry on its business as currently conducted and as
proposed to be conducted.  The Company is qualified to do business as a foreign
corporation in the States of California, New Jersey and Massachusetts, and is
not required to be qualified to do business as a foreign corporation in any
other jurisdiction where the failure to qualify would have a material adverse
effect on the Company.

     Section 2.02.  Subsidiaries.  Schedule 2.02 sets forth a list of each
     ------------   ------------   -------------
Subsidiary (as hereinafter defined).  Each Subsidiary is duly organized, validly
existing and in good standing under the laws of the jurisdiction of
incorporation of such Subsidiary, as set forth on Schedule 2.02.  Each
                                                  -------------
Subsidiary has all necessary corporate power and authority to own its properties
and to carry on its business as currently conducted and as proposed to be
conducted.  Except as set forth on Schedule 2.02, the Company has no
                                   -------------
Subsidiaries, holds no securities of any other entity, is not a party to any
joint venture or partnership and has made no investment in any third party.  As
used herein, "Subsidiary" means any corporation or other entity a majority of
              ----------
the voting securities or economic interest of which is held by the Company or
any Subsidiary.

     Section 2.03.  Charter and By-Laws.  The copies of the Certificate of
     ------------   -------------------
Incorporation and the By-Laws of the Company furnished to the Purchaser are true
and correct in all respects.

     Section 2.04.  Validity and Enforceability.  This Agreement is, and each of
     ------------   ---------------------------
the other agreements and instruments of the Company contemplated hereby will be
the valid and binding obligations of the Company, enforceable in accordance with
their respective terms, except as the enforcement thereof may be limited by
bankruptcy and other laws of general application relating to creditors' rights
or general principals of equity.

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     Section 2.05.  Capital Stock.
     ------------   -------------

          (a) The authorized capital stock of the Company consists of (x)
106,122 shares of preferred stock, $.01 par value per share (the "Senior
                                                                  ------
Preferred Shares"), all of which is issued and outstanding and (y) 1,500,000
----------------
shares of Common Stock of which 302,041 is issued and outstanding and 114,714
shares are reserved for future issuance upon the exercise of outstanding stock
options and the conversion of the Senior Preferred Shares.

          (b) Schedule 2.05(b) hereto sets forth a complete and accurate list of
              ----------------
all holders of the Company's outstanding capital stock, and all options,
warrants, convertible securities and other rights which may afford any person or
entity the right to acquire shares of any class of capital stock of the Company,
including, without limitation, any capital stock, option, warrant, convertible
security or other security or right which the Stockholder or the Company has a
current intention to issue or sell, in each case prior to and immediately after
the Closing.

          (c) Schedule 2.05(c) hereto also sets forth the authorized capital
              ----------------
stock of each Subsidiary, the number of shares of each class outstanding and the
record and beneficial holder thereof.  No Subsidiary has issued or granted any
option, warrant, convertible security or other right or agreement which affords
any person or entity the right to purchase or otherwise acquire any shares of
its capital stock.

          (d) Neither the Company nor any Subsidiary is subject to any
obligation (contingent or otherwise) to purchase or otherwise acquire or retire
any of its equity securities (other than in accordance with the Company's
Certificate of Incorporation or this Agreement).  Except as set forth on
Schedule 2.05(d), no person has any right of first refusal or preemptive right
----------------
in connection with the issuance of the Common Stock issuable upon exercise of
any stock options or the conversion of any Company indebtedness or with respect
to any future offer, sale or issuance of securities by the Company or its
shareholders, other than as set forth herein.

          (e) The shares of Common Stock purchased by Purchaser hereunder, when
delivered, will be duly and validly issued and outstanding, fully paid and
nonassessable, and free to the holder thereof of any liens, encumbrances and
restrictions (other than under applicable securities laws or as set forth in any
stockholders agreements to be entered into by Purchaser in connection with the
consummation of the transactions contemplated by this Agreement).

          (f) To the Company's knowledge, the offer and sale of all shares of
capital stock or other securities of the Company issued prior to the Closing
complied with or were exempt from all the registration provisions of federal and
state securities laws.

     Section 2.06.  Compliance With Law, etc.  The Company and each Subsidiary
     ------------   ------------------------
are not, and the execution, delivery and performance by the Company of this
Agreement and the other agreements contemplated hereby, or the taking of any
other action contemplated by this Agreement or any of such other agreements will
not result in (i) violation of any term of the Company's Certificate of
Incorporation or Bylaws, the charter or bylaws of any Subsidiary, (ii)

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material violation of any material agreement, lease, license, mortgage,
instrument, arrangement, judgment, decree, or order, (iii) violation of any law,
statute, rule or governmental regulation to which the Company or any Subsidiary
is subject, which would result in a material adverse change in the condition
(financial or otherwise), business, properties or prospects of the Company and
its Subsidiaries, on a consolidated basis. The Company and each Subsidiary have
all governmental licenses, authorizations, registrations and permits
(collectively, "Permits") necessary for the conduct of their businesses, as
currently conducted and as proposed to be conducted, all of which licenses,
registrations and permits are listed on Schedule 2.06 hereto, except where the
                                        -------------
failure to have any such Permit could not result in a material adverse change in
the condition (financial or otherwise), business, properties or prospects of the
Company and its Subsidiaries, on a consolidated basis.  All such licenses,
registrations and permits are in full force and effect and there is no
proceeding pending or threatened (or any basis therefor) to revoke or limit any
such license, registration or permit which would result in a material adverse
change in the condition (financial or otherwise), business, properties or
prospects of the Company and its Subsidiaries, on a consolidated basis.

     Section 2.07.  Financial Statements.  The Company has delivered to the
     ------------   --------------------
Purchaser (a) its consolidated balance sheet (the "Balance Sheet") as at June
                                                   -------------
30, 1999 (the "Balance Sheet Date"), and the audited, consolidated statement of
               ------------------
income, retained earnings and cash flows of the Company for the year then ended,
and (b) the audited, consolidated balance sheet of the Company and its
Subsidiaries as at December 31, 1998 and the related statement of income,
retained earnings and cash flows for the year then ended, audited by Ernst &
Young LLP.  Such financial statements and the notes thereto are complete and
accurate in all material respects and fairly present the consolidated financial
condition of the Company and its Subsidiaries at the dates thereof and the
results of operations for the periods then ended, and were prepared in
accordance with the books and records of the Company and its Subsidiaries in
conformity with generally accepted accounting principles consistently applied
during the periods covered thereby.

     Section 2.08.  Material Adverse Changes.  Except as set forth on Schedule
     ------------   ------------------------                          --------
2.08, since the Balance Sheet Date, the Company and each Subsidiary have
----
conducted their business only in the usual and ordinary course and there has
been no (a) material adverse change in the condition (financial or otherwise),
business, properties or prospects of the Company and its Subsidiaries, on a
consolidated basis, (b) material increase in the compensation or commission rate
payable by the Company or any Subsidiaries to any officer, director, employee or
agent or bonus or similar payment (or commitment therefor) to any officer,
director, employee, agent or Affiliate (as hereinafter defined) thereof, (c)
dividend, distribution, redemption, recapitalization or other transaction
involving the Company's capital stock, except as otherwise expressly
contemplated by this Agreement, (d) material capital expenditure or commitment
therefor, or (e) material acquisition or disposition of assets or property or
commitment therefor.

     Section 2.09.  Assets.
     ------------   ------

     (a)  Personal Property.  Except as set forth on Schedule 2.09(a), the
          -----------------                          ----------------
Company and each Subsidiary owns, or has a valid leasehold or license interest
in, all assets necessary for the conduct of its business as presently conducted
and as proposed to be conducted, in each case free and clear of all liens,
claims, security interests, charges and encumbrances.  All of such assets are

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reflected on the Balance Sheet, except to the extent acquired after the Balance
Sheet Date.  All material operating assets of the Company and the Subsidiaries
are in good operating condition and repair, normal wear and tear excepted.

     (b) Real Property.  The Company and each Subsidiary enjoys peaceful and
         -------------
quiet possession of their leased premises as shown on Schedule 2.09(b) and have
not received any notice asserting the existence of a default under any such
lease or indicating that the lessor thereunder has taken action or threatened
early termination of the lease.

     Section 2.10.  Litigation.  Except as set forth on Schedule 2.10, no
     ------------   ----------                          -------------
litigation, claims, actions, proceedings or investigations are pending, or to
the Company's knowledge, threatened against the Company or any Subsidiary.

     Section 2.11.  Tax Matters.  The Company and each Subsidiary has correctly
     ------------   -----------
and timely prepared and filed all tax returns required to have been filed by it
with all appropriate federal, state and local governmental agencies and timely
paid all taxes owed by it.  The charges, accruals and reserves on the books of
the Company and each Subsidiary in respect of taxes for all fiscal periods are
adequate, and there are no unpaid assessments of the Company or any Subsidiary
nor any basis for the assessment of any additional taxes, penalties or interest
for any fiscal period or audit by any federal, state or local taxing authority.
All taxes and other assessments and levies which the Company or any Subsidiary
is required to withhold or to collect for payment have been duly withheld and
collected and paid to the proper governmental entity or third party.  The
Company has furnished the Purchaser with true and correct copies of all of its
tax returns, including any amendments, for all open years.  There are no tax
liens or claims pending, or to the Company's knowledge, threatened against the
Company, or any Subsidiary, or any of their respective assets or property.
There are no outstanding tax sharing agreements or other such arrangements
between the Company or any Subsidiary and any other corporation or entity (other
than between the Company and its Subsidiaries).  The tax basis of the assets of
the Company by category, including the classification of such assets as being
depreciable or amortizable, as reflected in its tax returns, is true and correct
in all material respects.  The Company does not have a current election pursuant
to Section 1362 of the Internal Revenue Code of 1986, as amended (the "Code") to
                                                                       ----
be taxed as an S corporation.  Neither the Company, any Subsidiary nor the
Stockholder has ever filed a consent pursuant to Section 341(f) of the Code
relating to collapsible corporations.

     Section 2.12.  Material Contracts.  Schedule 2.12 is a complete and
     ------------   ------------------   -------------
accurate list of all of the following kinds of contracts, agreements and
arrangements (whether written or unwritten) of the Company or any Subsidiary:

          (a) contracts with any employee, officer, director or stockholder, or
any known relative or Affiliate (which term is used in this Agreement as defined
in the Rules promulgated under the Securities Act of 1933, as amended (the
"Act")) thereof;
 ---

          (b) licenses, leases, contracts and other arrangements with respect to
any property of the Company or any Subsidiary having a value or resulting in (or
required to

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generate) revenues to or expenses of the Company or its Subsidiaries of $100,000
or more, including without limitation, all real estate leases, and licenses
relating to the use of Intellectual Property (as defined in Section 2.21);

          (c) agreements, contracts or instruments relating to the borrowing of
money, the capital lease or purchase on an installment basis of any asset or the
guarantee of any of the foregoing involving more than $75,000;

          (d) contracts with respect to which the Company or any Subsidiary has
any liability or obligation, contingent or otherwise, or which may otherwise
have a continuing effect for one year or more after the date of this Agreement,
involving more than $75,000;

          (e) contracts which place any material limitation on the method of
conducting or scope of the business of the Company or any Subsidiary; and

          (f) any other contract which would be required to be disclosed as an
exhibit to a Registration Statement on Form S-1 under the Act filed by the
Company.

     The Company has furnished to the Purchaser copies of all such contracts
(including all amendments and modifications thereto), or written descriptions
thereof, in the case of oral contracts, and each such contract (or written
description) sets forth the entire (or material terms in the case of an
unwritten agreement) agreement and understanding between the Company or a
Subsidiary and the other parties thereto.  Each such contract is valid, binding
and in full force and effect, and there is no event which has occurred or
exists, which constitutes or which, with notice, the happening of any event
and/or the passage of time, would constitute a default or breach by the Company
or a Subsidiary under any such contract or would cause the acceleration of any
obligation of any party thereto or give rise to any right of any other party of
termination or cancellation thereof.  Neither the Company nor the Stockholder
has any reason to believe that the parties to such contracts will not fulfill
their obligations thereunder in all material respects.

     Section 2.13.  Employees and Compensation.  Schedule 2.13 sets forth a
     ------------   --------------------------   -------------
complete and accurate list of (a) all employment and consulting contracts,
arrangements or plans with any employee of or consultant to the Company or any
Subsidiary and (b) all employees of and consultants to the Company or any
Subsidiary, with 1998 compensation in excess of $100,000, showing date of hire,
hourly rate or salary or other basis of compensation and other benefits accrued
as of a recent date, each increase and bonus granted since January 1, 1998, and
job function of salaried employees.  None of the employees of the Company or any
Subsidiary is represented by a union, and there is no labor strike, dispute,
slowdown, stoppage, organizational effort, dispute or proceeding by or with any
employee or former employee of the Company or any Subsidiary or any labor union
pending or, to the knowledge of the Company, threatened against the Company or
any Subsidiary.

     Section 2.14.  Customers and Suppliers.   Schedule 2.14 sets forth a list
     ------------   -----------------------    -------------
of all customers of the Company or any Subsidiary which accounted for at least
$500,000 of gross sales by the Company or each Subsidiary during the fiscal year
ended December 31, 1998.  To the

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Company's knowledge, the Company's and each Subsidiary's relationships with such
customers and with its material suppliers are good commercial working
relationships. Except as set forth on Schedule 2.14, since December 31, 1997, no
                                      -------------
supplier representing more than $500,000 of annualized purchases by the Company
or any Subsidiary (in the case of a supplier) has terminated or, to the
Company's knowledge, threatened to terminate, its relationship with the Company
or any Subsidiary, or has decreased materially or threatened to decrease or
limit materially the services, supplies or materials supplied to or purchased
from the Company or any Subsidiary.

     Section 2.15.  Environmental Matters.  Except as provided on Schedule 2.15,
     ------------   ---------------------                         -------------
(a) the ownership or use of the Company's and the Subsidiaries' premises and
assets, the occupancy and operation thereof, and the conduct of the Company's
and the Subsidiaries' business are in compliance in all material respects with
all applicable federal, state and local laws, ordinances, regulations, standards
and requirements relating to safety, health, pollution, environmental
protection, hazardous substances and related matters and (b) there is no
liability attaching to such premises or assets or the ownership, use or
operation thereof as a result of any hazardous substance that may have been
discharged on or released from such premises, or disposed of on-site or off-
site, or any other circumstances occurring prior to the Closing or existing as
of the Closing.  For purposes of this Section, "hazardous substance" shall mean
oil or any other substance which is included within the definition of a
"hazardous substance," "pollutant," "toxic substance," "toxic waste," "hazardous
waste," "contaminant" or other words of similar import in any federal, state or
local environmental law, ordinance or regulation.

     Section 2.16.  Insurance.  Schedule 2.16 lists all insurance policies
     ------------   ---------   -------------
maintained by the Company or any Subsidiary, all of which are valid and in full
force.  All premiums due to date under such policies have been paid, and no
default exists thereunder.  To the Company's knowledge, the insurance listed on
Schedule 2.16 is in amounts adequate and appropriate for the business, and to
-------------
avoid the operation of any coinsurance provision.  Neither the Company nor any
Subsidiary has received any notice of any proposed material increase in the
premiums payable for coverage, or proposed reduction in the scope (or
discontinuance entirely) of coverage, under any of such insurance policies.

     Section 2.17.  Employee Benefit Plans.
     ------------   ----------------------

          (a) Schedule 2.17 sets forth all employee benefit plans, agreements,
              -------------
commitments, practices or arrangements of any type (including, but not limited
to, plans described in Section 3(3) of the Employee Retirement Income Security
Act of 1974, as amended ("ERISA") maintained by the Company or any Subsidiary
                          ------
for the benefit of current or former employees or directors of the Company or
any Subsidiary, or with respect to which the Company or any Subsidiary has a
liability, whether direct or indirect, actual or contingent (including, but not
limited to, liabilities arising from affiliation under Section 414(b), (c), (m)
or (o) of the Code or Section 4001 of ERISA) (collectively, the "Benefit
                                                                 -------
Plans").  There are no material benefit plans, agreements, commitments,
-----
practices or arrangements of any type providing benefits to employees or
directors of the Company or any Subsidiary, other than the Benefit Plans.

                                      -7-
<PAGE>

          (b) With respect to each Benefit Plan, the Company has delivered to
the Purchaser true and complete copies of: (i) any and all plan texts and
agreements; (ii) any and all material communications to employees (including all
summary plan descriptions and material modifications thereto); (iii) the two
most recent annual reports, if applicable; (iv) the most recent annual and
periodic accounting of plan assets, if applicable; and (v) the most recent
determination letter received from the Internal Revenue Service (the "Service"),
                                                                      -------
if applicable.

          (c) With respect to each Benefit Plan: (i) if intended to qualify
under Section 401(a) of the Code, such plan so qualifies, and its trust is
exempt from taxation under Section 501(a) of the Code; (ii) such plan has been
administered and enforced in accordance with its terms and all applicable laws
in all material respects; (iii) no breach of fiduciary duty by the Company has
occurred with respect to which the Company, any Subsidiary or any Benefit Plan
may be liable or otherwise damaged in any material respect; (iv) no material
disputes are pending or threatened; (v) no "prohibited transaction" (within the
meaning of either Section 4975(c) of the Code or Section 406 of ERISA) has
occurred with respect to which the Company or any Benefit Plan may be liable or
otherwise damaged in any material respect; (vi) all contributions, premiums, and
other payment obligations have been accrued on the financial statements of the
Company in accordance with generally accepted accounting principles, and, to the
extent due, have been made on a timely basis, in all material respects; (vii)
all contributions made or required to be made under such plan meet the
requirements for deductibility under the Code; (viii) the Company has expressly
reserved in itself the right to amend, modify or terminate such plan, or any
portion of it, without liability to itself; (ix) no such plan requires the
Company to continue to employ any employee or director.

          (d) With respect to each Benefit Plan which provides welfare benefits
of the type described in Section 3(1) of ERISA: no such plan provides medical or
death benefits with respect to current or former employees or directors of the
Company beyond their termination of employment, other than coverage mandated by
Sections 601-608 of ERISA and 4980B(f) of the Code, (ii) each such plan has been
administered in compliance with Sections 601-608 of ERISA and 4980B(f) of the
Code; and (iii) no such plan has reserves, assets, surpluses or prepaid
premiums.

     Section 2.18.  Registration Rights.  Except as set forth on Schedule 2.18,
     ------------   -------------------                          -------------
the Company is not a party to any agreement or commitment which obligates the
Company to register under the Act any of its outstanding securities or any of
its securities which may hereafter be issued.

     Section 2.19.  Offering.  Subject to the accuracy of the Purchaser's
     ------------   --------
representations in Article IV of this Agreement, the offer, issuance and sale of
the Common Stock constitutes, and will constitute, transactions exempt from the
registration requirements of Section 5 of the Act and the Company has obtained
all qualifications, permits, and other consents, if any, required by all
applicable state securities laws.

     Section 2.20.  Affiliate Transactions.  Except as set forth on Schedule
     ------------   ----------------------                          --------
2.20, neither the Company nor any Subsidiary is a party to any material contract
----
or arrangement, either directly or indirectly, with any of the officers,
directors or stockholders of the Company or any Subsidiary,

                                      -8-
<PAGE>

their known relatives or Affiliates.

     Section 2.21.  Intellectual Property.  Schedule 2.21 sets forth all
     ------------   ---------------------   -------------
patents, trademarks, service marks, trade names, copyrights, domain names,
franchises and licenses, all royalties and license agreements, all applications
therefor, and all other rights with respect to the foregoing owned or used by
the Company or any Subsidiary ("Intellectual Property").  The intellectual
                                ---------------------
property and rights set forth on Schedule 2.21 include all of the foregoing
                                 -------------
necessary for the operation of the Company's and the Subsidiaries' business as
now conducted and as proposed to be conducted.  To the Company's knowledge, the
Company's and each Subsidiary's ownership and use of the foregoing does not
infringe or conflict with the rights of others; neither the Company nor any
Subsidiary is or will be obligated to make any royalty, fee or other payments in
connection with its ownership or use of any patent, trademark, trade name,
copyright or other intangible asset in connection with the conduct of its
business as now conducted and as proposed to be conducted, except as described
on Schedule 2.21.  Except as set forth on Schedule 2.21, neither the Company nor
   -------------                          -------------
any Subsidiary has been notified of any claim by any person or entity that the
Company or any Subsidiary is violating any trademark, service mark, trade name,
patent or copyright, or other intangible asset or right owned by any other
person or entity or that is using any name that is confusingly similar to that
of any other person or entity, and, to the Company's knowledge, there is no
basis for any such claim.

     Section 2.22.  Proprietary Information of Third Parties.  Except as set
     ------------   ----------------------------------------
forth on Schedule 2.22, no third party has claimed or, to the Company's
         -------------
knowledge, has reason to claim that any person employed by or affiliated with
the Company or any Subsidiary has (a) violated or, to the Company's knowledge,
may be violating any of the terms or conditions of such person's employment,
non-competition or non-disclosure agreement with such third party, (b) disclosed
or, to the Company's knowledge, may be disclosing or utilized or, to the
Company's knowledge, may be utilizing any trade secret or proprietary
information or documentation of such third party or (c) interfered or, to the
Company's knowledge, may be interfering in the employment relationship between
such third party and any of its employees.  To the Company's knowledge, no
person or entity employed by or affiliated with the Company or any Subsidiary
has employed or proposes to employ any trade secret or any information or
documentation proprietary to any other person or entity in connection with the
business of the Company or any Subsidiary.

     Section 2.23.  Brokers.  Except as set forth on Schedule 2.23, no finder,
     ------------   -------                          -------------
broker, agent, financial advisor or other intermediary has acted, directly or
indirectly, on behalf of the Company or any Subsidiary in connection with the
offering of the Common Stock or the negotiation or consummation of this
Agreement or any of the transactions contemplated hereby, or is entitled to any
fee, payment, commission or other consideration with respect thereto.

     Section 2.24.  Absence of Material Undisclosed Liabilities.  Except for (a)
     ------------   -------------------------------------------
any and all liabilities, accounts payable and accrued expenses reflected on the
Balance Sheet or incurred in the ordinary course of business since the Balance
Sheet Date, and (b) obligations of future performance under contracts set forth
on a Schedule hereto and other contracts entered into in the ordinary course of
business which are not required to be listed on a Schedule hereto, as of the

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<PAGE>

Closing Date, the Company will have no material liabilities or obligations,
whether absolute, accrued, contingent or otherwise and whether due or to become
due.

     Section 2.25.  Year 2000 Compliance.  Except as otherwise disclosed on
     ------------   --------------------
Schedule 2.25, the Company, its Subsidiaries and its Management Systems and
-------------
Production and Distribution Systems are or will be Year 2000 Compliant on or
before December 31, 1999.  As used in this Section the following terms have the
following meanings:

     "Year 2000 Compliant" means, with respect to any person, that neither the
year change from 1999 to 2000 (the arrival of the date January 1, 2000) nor leap
year dates thereafter will (i) impair such person's ability to meet its
obligations to third parties or (ii) result in errors or corruption in
processing internally generated data or otherwise have a material adverse effect
on the operations or functionality of such person or its Management Systems or
Production and Distribution Systems, all of which will continue to operate as
intended prior to, during and after January 1, 2000.

     "Management Systems" include, but are not limited to, all computer hardware
(including integrated circuit/chip and firmware) and software applications that
a person uses for managing and operating its business, including without
limitation, functions such as accounting and billing, inventory tracking and
maintenance and vendor and supplier sourcing.

     "Production and Distribution Systems" include, but are not limited to, all
computer hardware (including integrated circuit/chip and firmware) and software
applications, and all automated or electronic equipment, controls and other
systems used by a person in its production or distribution process, from the
point of input or raw material to final products and merchandise offered for
sale and distributed to customers.

     Section 2.26.  Required Consents.   Except for the consents specified on
     ------------   -----------------
Schedule 2.26, no consent, order, authorization, approval, declaration or
-------------
filing, including, without limitation, any consent, approval or authorization of
or declaration or filing with any governmental authority or any party to a
material contract, is required on the part of the Company or any Subsidiary (and
no notices to or consents or other approvals from any of the lessors or any of
such lessors' mortgagees under any of the real property leases are required) for
or in connection with the execution, delivery or performance of this Agreement
and each of the other agreements contemplated hereby or the conduct of the
business by the Company or any Subsidiary after the Closing, or to prevent a
material default.  The Company has no reason to believe that all of the required
consents and approvals not obtained as of the Closing will not be obtained
within six (6) months of Closing without material cost to the Company.  Subject
to obtaining the consents specified on Schedule 2.26, the execution, delivery
                                       -------------
and performance of this Agreement and the other instruments and agreements
contemplated hereby by the Company will not result in any material violation of,
be in material conflict with or constitute a material default under, any law,
statute, regulation, ordinance, contract, agreement, instrument, judgment,
decree or order to which the Company is a party or by which the Company is
bound.

                                      -10-
<PAGE>

                                  ARTICLE III
                 REPRESENTATIONS AND WARRANTIES OF STOCKHOLDER

     Stockholder represents and warrants to the Purchaser that the information
set forth in this Article III is true and correct as of the date hereof and will
be true and correct as of the Closing.

     Section 3.01.  Ownership of Stock.  Stockholder is the record and
     ------------   ------------------
beneficial owner of the number of shares of Common Stock listed in the preamble
to this Agreement, free and clear of all liens, encumbrances, restrictions and
claims of every kind, excluding the Stockholders Agreement, dated March 16,
1999, by and among the Company, Boston Ventures Limited Partnership V, Seacoast
Capital Partners Limited Partnership, Thybo New Ventures Limited and
Stockholder.

     Section 3.02.  Authority.  Stockholder has full legal right, power and
     ------------   ---------
authority to make, execute, deliver and perform this Agreement and to sell,
assign, transfer and convey the shares of Common Stock owned by the Stockholder
pursuant to this Agreement.  This Agreement has been duly and validly executed
and delivered by the Stockholder and, assuming due execution and delivery by the
Purchaser, constitutes a legal, valid and binding agreement of the Stockholder
enforceable against the Stockholder in accordance with its terms, except to the
extent that its enforceability may be subject to applicable bankruptcy,
reorganization, insolvency, moratorium and similar laws affecting the
enforcement of creditors' rights generally and by general principles of equity.

                                  ARTICLE IV
                REPRESENTATIONS AND WARRANTIES OF THE PURCHASER

     The Purchaser represents and warrants to the Company that that the
information set forth in this Article IV is true and correct as of the date
hereof and will be true and correct as of the Closing:

     Section 4.01.  Investment Intent.   The Common Stock to be acquired by it
     ------------   -----------------
is being acquired solely for its own account, for investment purposes only and,
with no present intention of distributing, selling, transferring or otherwise
disposing of it, and the Purchaser has no present plans to enter into any such
contract, undertaking, agreement or arrangement with respect thereto.

     Section 4.02.  Economic Risk; Sophistication.   The Purchaser is able to
     ------------   -----------------------------
bear the economic risk of an investment in the Common Stock to be acquired by
it, can afford to sustain a total loss on such investment and has such knowledge
and experience in financial and business matters that it is capable of
evaluating the merits and risks of the proposed investment.

     Section 4.03.  Authority.   The Purchaser is duly organized, validly
     ------------   ---------
existing and in good standing under the laws of the State of Massachusetts.  The
Purchaser has all requisite power and

                                      -11-
<PAGE>

authority to enter into this Agreement and perform its obligations hereunder,
and this Agreement constitutes the valid and binding obligation of the Purchaser
enforceable against it in accordance with its terms.

     Section 4.04.  Brokers.   No finder, broker, agent, financial advisor or
     ------------   -------
other intermediary has acted on behalf of the Purchaser in connection with the
negotiation or consummation of this Agreement or any of the transactions
contemplated hereby, and no such person is entitled to any fee, payment,
commission or other consideration with respect thereto as a result of any
arrangement made by the Purchaser.

     Section 4.05.  Limited Liquidity.   The Purchaser understands that the
     ------------   -----------------
Common Stock to be acquired by it may not be sold, transferred or otherwise
disposed of without registration under the Act and any state securities laws, or
an exemption therefrom (supported by an opinion of counsel satisfactory to the
Company), and that in the absence of an effective registration statement
covering such securities or an available exemption from registration, such
securities may be required to be held indefinitely.  The Purchaser is aware that
the Common Stock to be acquired by it may not be sold pursuant to Rule 144
promulgated under the Act, unless all of the conditions of that Rule are met and
that among the conditions for use of Rule 144 is the availability of current
information to the public about the Company and that the Company has no
obligation to make such information available.  The Purchaser represents that,
in the absence of an effective registration statement covering the Common Stock,
they shall sell, transfer or otherwise dispose of such securities only in a
manner consistent with the representations set forth herein, and the
certificates for the Common Stock shall bear a legend to such effect.

     Section 4.06.  Accredited Investor. Purchaser is an "accredited investor"
     ------------   -------------------
as defined in Regulation D under the Act, and, together with its financial
advisors, if any, has such knowledge and experience in financial and business
matters as to be capable of evaluating the merits and risks involved in
purchasing the Common Stock.

     Section 4.07.  Purchaser Information.   All of the information furnished by
     ------------   ---------------------
Purchaser in response to the Company's questionnaire is true and complete in all
material respects.

                                   ARTICLE V
                              CLOSING CONDITIONS

     Section 5.01.  Conditions to Closing. Purchaser's obligation to purchase
     ------------   ---------------------
the Common Stock to be acquired by it at the Closing is subject to the
satisfaction, as of the Closing Date, of the following conditions:

     (a)  Stockholders Agreement. A Stockholders Agreement substantially in the
          ----------------------
form of Exhibit 5.01 (a) attached hereto shall have been executed by the
        ----------------
parties named therein.

     (b)  Registration Rights Agreement. A Registration Rights Agreement
          -----------------------------
substantially in the form of Exhibit 5.01 (b) attached hereto shall have been
                             ----------------
executed by the parties named therein.

                                      -12-
<PAGE>

     (c)  Joint Marketing Agreement. The Company and Cahners Business
          -------------------------
Information shall agree to and execute a Joint Marketing Agreement substantially
in the form of Exhibit 5.01(c) attached hereto.
               ---------------

     (d)  Representations and Warranties.   The representations and warranties
          ------------------------------
contained in Articles II, III, and IV shall be true and correct in all material
respects on and as of the Closing Date as though made on and as of such date
(except representations and warranties made as of a specified date, which shall
be true as of such date), except that the representations and warranties
contained in Sections 2.05 and 3.01 will be true and complete in all respects on
and as of the Closing Date.

     (e)  Certificate; Documents. The Purchaser shall have received copies of
          ----------------------
each of the following, certified by the Secretary of the Company: (i) the
Company's Certificate of Incorporation, (ii) a certificate of the Secretary of
State of the State of New York as to the legal existence and good standing of
the Company; (iii) the Company's Bylaws; (iv) the resolutions adopted by the
directors of the Company authorizing the execution, delivery and performance of
this Agreement and the other agreements contemplated hereby, the issuance, sale
and delivery of the Common Stock hereunder; and (v) evidence of the
qualification of the Company as a foreign corporation in the States of
California, Massachusetts and New Jersey. The Purchaser shall also have received
such other certificates and documents as the Purchaser shall reasonably request.

     (f)  Legal Opinion.  The Purchaser shall have received a legal opinion in
          -------------
form and substance satisfactory to the Purchaser from Gould & Wilkie LLP,
counsel for the Company, substantially in the form set forth in Exhibit 5.01(f)
                                                                ---------------
hereof.

     (g)  Stock Certificates.  The Purchaser shall have received one or more
          ------------------
duly executed certificates representing the Common Stock to be acquired by it.

                                  ARTICLE VI
                                 MISCELLANEOUS

     Section 6.01.   Notices.   All notices, demands or other communications
     ------------    -------
hereunder shall be in writing and shall be deemed to have been duly given if
delivered in person, or by nationally recognized overnight courier services, or
otherwise actually delivered:

          (a)  if to Stockholder, to:

               PartMiner, Inc.
               432 Park Avenue South, 12/th/ floor
               New York, N.Y. 10016
               Attention: Daniel Nissanoff

               if to the Company, to:

                                      -13-
<PAGE>

               PartMiner, Inc.
               432 Park Avenue South, 12/th/ floor
               New York, N.Y. 10016
               Attention: Michael R. Manley, Esq.
               Vice President and General Counsel

               with a copy to:

               Gould & Wilkie LLP
               One Chase Manhattan Plaza
               New York, N.Y. 10005-1401
               Attention: George J. Walsh, III, Esq.

          (b)  if to Purchaser, to:

               Elsevier Realty Information, Inc.
               c/o Cahners Business Information
               275 Washington Street
               Newton, MA 02458
               Attention: Chief Executive Officer and Chief Legal Counsel

               with a copy to:

               Cahners Business Information
               1350 East Touhy Avenue
               Des Plaines, IL 60018
               Attention: Mr. Brian Nairn

or at such other address as may have been furnished by such person in writing to
the other parties. Any such notice, demand or other communication shall be
deemed to have been given on the date actually delivered or as of the date
deposited with the courier, as the case may be.

     Section 6.02.  Severability and Governing Law.   If any provision of this
     ------------   ------------------------------
Agreement is rendered void, invalid or unenforceable by any court of law for any
reason, such invalidity or unenforceability shall not void or render invalid or
unenforceable any other provision of this Agreement.  This Agreement shall be
governed by and construed in accordance with the internal laws of the State of
New York, without regard to its conflicts of laws provisions.

     Section 6.03.  Amendments, Etc.   This Agreement may be changed, waived or
     ------------   ---------------
terminated only with the written consent of the Stockholder, the Company and the
Purchaser.

     Section 6.04.  Survival.   All agreements, representations and warranties
     ------------   --------
contained herein and in any certificate, documentation or agreement delivered
pursuant hereto shall survive the execution and delivery of this Agreement, any
investigation at any time made, and the sale and

                                      -14-
<PAGE>

purchase of the Common Stock until two (2) years from the Closing or if earlier,
until the Closing of the initial public offering of the Company's securities.

     Section 6.05.  The Company agrees to pay (a) the reasonable fees, up to
     ------------
$12,500, and expenses of counsel to Purchaser incurred with respect to any
amendments or waivers required by the Company (whether or not they become
effective) under or with respect to the Company's Certificate of Incorporation,
Bylaws, this Agreement or any agreement or instrument contemplated hereby and
(b) in the event of a proven material breach or default of the Company's
obligations to Purchaser under the Certificate of Incorporation, the Bylaws,
this Agreement or any agreement or instrument contemplated hereby, the
reasonable fees and expenses of Purchaser incurred in connection with the
enforcement of the rights granted under any of the foregoing.

     Section 6.06.  Successors and Assigns.  This Agreement, and all provisions
     ------------   ----------------------
hereof, shall be binding upon and inure to the benefit of the respective
successors and assigns of the parties hereto, provided that, the Purchaser may
not assign its right to purchase the Common Stock without the consent of the
Company in its sole discretion.

     Section 6.07.  Entire Agreement.  This Agreement, the attached exhibits
     ------------   ----------------
and schedules and the other agreements, documents and instruments contemplated
hereby contain the entire understanding of the parties, and there are no further
or other agreements or understandings, written or oral, in effect between the
parties relating to the subject matter hereof unless expressly referred to
herein.

     Section 6.08.  Counterparts.  This Agreement may be executed in one or more
     ------------   ------------
counterparts by facsimile signature, and with counterpart signature pages, each
of which shall be an original, and all of which together shall constitute one
and the same Agreement.

                                      -15-
<PAGE>

     IN WITNESS WHEREOF, the parties hereto have executed and delivered this
Agreement as a sealed instrument as of the date first above written.

                                 PARTMINER, INC., f/k/a Dast Corporation

                                     /s/ Daniel Nissanoff
                                 By:______________________________________
                                                       (Title)

                                 ELSEVIER REALTY INFORMATION, INC.

                                     /s/ Charles P. Fontaine
                                 By:______________________________________
                                                       (Title)

                                 /s/ Daniel Nissanoff
                                 _________________________________________
                                 Daniel Nissanoff

                                      -16-<PAGE>

                                                                   EXHIBIT 10.11

                           JOINT MARKETING AGREEMENT

     THIS JOINT MARKETING AGREEMENT ("Agreement") is dated this 10th day of
September, 1999 ("Effective Date") and is by and between Cahners Business
Information, a division of Reed Elsevier Inc., a Massachusetts corporation
("Cahners"), and PartMiner, Inc., a New York corporation (the "Company").

     WHEREAS, Cahners is publisher of certain online and print publications
which Cahners makes available to customers on a subscription or access basis;
and

     WHEREAS, the Company has developed a component sourcing software
application known as PartMiner, and is engaged in building e-commerce
marketplaces; and

     WHEREAS, Cahners and the Company desire to create interfaces to each
other's products for marketing purposes, on the terms and subject to the
conditions set forth in this Agreement.

     NOW, THEREFORE, in consideration of the foregoing premises and the
covenants and agreements hereinafter set forth, the sufficiency of which is
mutually acknowledged, Cahners and the Company hereby agree as follows:

1.   Definitions.  When used in this Agreement, the following terms shall have
     -----------
     the meanings indicated below:

     1.1  "Aggregated E-Commerce Web Site" shall mean a web site that is
          accessible to the general public (with or without a registration fee)
          which aggregates pricing and availability data for electronic
          components from multiple distributors for the sale of such electronic
          components on or at such web site.

     1.2  "Cahners Content" shall mean the Cahners' proprietary content
          generally described in Exhibit A to this Agreement, containing
                                 ---------
          information regarding electronic components, including any updates of
          such content, as the same may be modified from time to time by Cahners
          in its sole discretion.

     1.3  "Cahners Publications" shall mean the properties (both print and
          electronic) owned by Cahners described on Exhibit B attached hereto.
                                                    ---------

     1.4  "e-inSITE" shall mean the Cahners' online network of web sites and
          related publications accessible through the URL www.e-insite.net and
                                                          ----------------
          indicated in section 1 of Exhibit B attached hereto.
                                    ---------

     1.5  "PartMiner" shall mean the Company's proprietary software application
          interface and web site, and any updates, enhancements, derivatives, or
          new versions thereof, and any software applications and interfaces
          which the
<PAGE>

          Company acquires, generates, creates or otherwise develops to
          facilitate e-commerce for the electronic components market.

     1.6  The Cahners Publications, e-inSITE and PartMiner may be collectively
          referred to hereinafter as the "Products".

2.   Development and Support.  Within thirty (30) days of the Effective Date,
     -----------------------
     each of the parties will use their commercially best efforts to jointly
     develop an implementation plan for establishing the interface between e-
     inSITE and PartMiner (the "Plan").

     2.1  The Plan will be in the form set forth in the attached Exhibit C, and
                                                                 ---------
          will be expanded to include product release schedules for
          functionality, integration strategy, and allocation of resources for
          development and support, and milestone dates for completion of, among
          other things, the following tasks:

          2.1.1  The establishment by the Company of a custom link to e-inSITE
                 from PartMiner through Cahners' Internet interface. The Company
                 will, at its sole expense, use commercially reasonable efforts
                 to develop the software, applications, and interfaces with
                 respect to PartMiner necessary to link e-inSITE with PartMiner;
                 provided that, the Company will not be responsible for
                 --------
                 developing the interface with respect to e-inSITE necessary to
                 allow PartMiner to link with e-inSITE; and

          2.1.2  The development by Cahners of an interface with respect to e-
                 inSITE that will allow PartMiner to link with e-inSITE. Cahners
                 will, at its sole expense, use commercially reasonable efforts
                 to develop the software, applications and interfaces needed to
                 link e-inSITE with PartMiner; provided that, Cahners will not
                                               -------- ----
                 be responsible for developing the interface with respect to
                 PartMiner necessary to allow e-inSITE to link with PartMiner.

     2.2  Except as otherwise agreed to by the parties or with respect to links
          established under Section 2.1 above (which links will not allow access
          to IHS data other than in the same manner that any other registered
          user of PartMiner accesses such data), the parties agree that any such
          links from the Cahners website to the PartMiner website will be
          established in accordance with the following terms and conditions:

          2.2.1  Articles from Cahners publications appearing on e-inSITE that
          provide product reviews on specific electronic components shall, to
          the extent practicable, include in such reviews on e-inSITE a
          hyperlink to PartMiner.

2
<PAGE>

          2.2.2  Each web page in which such articles appear will reference a
          caption at a location that need not be at such hyperlinks that reads
          substantially as follows: "click here to order product or to access
          PartMiner for product pricing and availability information, including
          technical information provided by IQXpert." The hyperlink will further
          identify PartMiner and IQXpert in such a manner as shall be approved
          by the Company, such approval not to be unreasonably withheld or
          delayed.

          2.2.3  An e-inSITE user that has accessed the product review on e-
          inSITE may click on the hyperlink and be transported to PartMiner.

          2.2.4  The Company will verify whether or not the e-inSITE user
          transported from e-inSITE is a registered PartMiner user.

          2.2.5  If the e-inSITE user is not a registered PartMiner user,
          PartMiner will display a registration page.

          2.2.6  After the e-inSITE user completes the registration process or
          the Company verifies that the e-inSITE user is a registered PartMiner
          user, such user may click on a hyperlink to the page generally
          described below in Section 2.2.7, which page will be identical to the
          page where any registered PartMiner user conducting a general part
          number search from the PartMiner home page would arrive.

          2.2.7   Following completion of the registration process or
          verification by the Company that the e-inSITE user is a registered
          PartMiner user, PartMiner will display a page that allows the user to
          click an icon to enter an RFQ for purchase of the reviewed product or
          click an icon to view the specific datasheet for the single reviewed
          product.

          2.2.8  The user will not be permitted to view multiple datasheets.

          2.2.9  After the user has entered an RFQ for the reviewed product or
          viewed the datasheet for the reviewed product, the user shall be able
          to "click" to access other resources on the PartMiner site or
          hyperlink back to e-inSITE. Cahners will not incorporate features into
          e-inSITE that substantially enhance or are otherwise specific to the
          use of PartMiner by e-inSITE users, other than the features described
          in this Section 2.2 or established pursuant to Section 2.1 above that
          will permit such e-inSITE user that has linked to PartMiner to
          purchase the product or view the specific datasheet for the electronic
          component reviewed in the article on e-inSITE that contains the link.

     2.3  Certain data, including but not limited to product datasheets,
contained on PartMiner is licensed by the Company from Information Handling
Services, Inc. and/or its affiliates ("IHS"). The terms set forth in Section 2.2
above provide the only basis on which Cahners may provide or facilitate access
to any data of IHS. Cahners agrees that

3
<PAGE>

any advertising, marketing, promotional or other materials, as well as any
references on its website, that refer to the link to any data of IHS will be
subject to the prior written approval of the Company, such approval not to be
unreasonably withheld or delayed.

     2.4  Cahners shall use commercially reasonable efforts to provide the
Company with a list of part numbers for all electronic components included in
the product reviews referred to in Section 2.2.1 above, prior to the publication
of such articles. The Company shall have the right to provide IHS on a regular
basis with such list of part numbers for use by IHS in identifying additional
parts for inclusion in its databases.

     2.5  To the extent that any approvals of the Company under this Section 2
relate to IHS or any products owned by IHS, the parties acknowledge that the
Company will need to obtain IHS' approval. The Company will use commercially
reasonable efforts to obtain such approvals as promptly as possible.

3.   Sales and Marketing.
     -------------------

     3.1  Cahners shall prominently promote and identify the Company as e-
          inSITE's e-commerce business partner for electronic components to the
          EOEM market in the Cahners Publications. Subject to the agreement of
          the parties, Cahners shall have the right to determine the frequency
          and placement of such promotional materials. Notwithstanding the
          foregoing, such promotion shall include, without limitation, the
          following: (i) PartMiner shall be identified on all appropriate e-
          inSITE advertisements in which e-inSITE's network partners are
          identified; and (ii) an introductory advertisement shall be included
          in appropriate e-inSITE publications introducing the Company as a
          partner of Cahners, including, without limitation, in EDN, Electronic
          Business, ECN and Electronic News. The Company shall prominently
          promote and identify Cahners as PartMiner's e-commerce business
          partner for electronic components to the EOEM market on PartMiner and
          in any advertisements for PartMiner in which its network partners are
          identified.

     3.2  The Company agrees that Cahners shall be the Company's exclusive
          advertising agent to electronic component distributors and
          manufacturers for the sale of advertising on PartMiner; provided that,
          Cahners meets or exceeds the annual performance targets set forth on
          Exhibit D attached hereto. In the event Cahners does not meet or
          ---------
          exceed the targets set forth on Exhibit D attached hereto, Cahners'
                                          ---------
          appointment as advertising agent for PartMiner will become non-
          exclusive. Cahners shall be entitled to a representation fee of twenty
          percent (20%) of all advertising sold by Cahners on behalf of the
          Company. All advertising sold by Cahners on behalf of the Company
          shall be subject to the approval of the Company, which approval shall
          not be unreasonably withheld or delayed. Cahners shall submit a
          monthly invoice for such representation fees to the Company
          accompanied by a statement prepared by Cahners identifying

4
<PAGE>

          the advertisements for which the fees are being paid and the
          computation of such fees. The Company shall pay such invoices within
          thirty (30) days of receipt. The obligation of the Company to pay the
          foregoing fees shall survive termination of this Agreement for all
          advertisements sold by Cahners during the term of this Agreement.

     3.3  The Company shall purchase a minimum of $500,000 in advertising from
          Cahners for each twelve (12) month period during the term of this
          Agreement commencing on the date of this Agreement ("Ad Minimum").
          The Company will consider an increase in this Ad Minimum in the event
          that an increase in the Company's aggregated advertising/marketing
          budget as of the date of this Agreement is approved by the Board of
          Directors during the term of this Agreement. Cahners shall charge the
          Company for such advertising at the rates set forth on Exhibit E
                                                                 ---------
          attached hereto.

     3.4  The parties shall exchange user information collected from registered
          users of PartMiner and e-inSITE, respectively (the "User Information")
          (except for users who "opt out" of such lists under a party's privacy
          policy or any applicable laws); provided, however, such User
                                          --------  -------
          Information will not include the e-mail addresses of any registered
          user of either PartMiner or e-inSITE. The User Information provided to
          Cahners will be branded as PartMiner or Company information and will
          include aggregated purchasing pattern information, specifically
          including aggregated data related to (i) products purchased, (ii) the
          top 100 part numbers searched, (iii) page views, and (iv) user
          sessions. This User Information will be restricted to the parties and
          will not be distributed, disclosed or otherwise provided to any third
          party, except that Cahners will be permitted to use this information
          to develop editorial content for the Cahners Publications, provided
          that, such content does not contain any user-identifying information.
          Notwithstanding the foregoing, on a quarterly basis, each party will
          allow the other party to send one promotional e-mail to the other
          party's complete registered user list (except for users who "opt out"
          of such lists under a party's privacy policy or any applicable laws).
          Such promotional e-mail shall be subject to the approval of the other
          party, which approval shall not be unreasonably withheld or delayed.

     3.5  During the term of this Agreement, Cahners will have a right of first
          refusal to make a development proposal with respect to any commercial
          data products to be developed from information or data of the Company
          which are intended to be sold or licensed to third parties.  The
          parties will negotiate in good faith on a product-by-product basis a
          mutually acceptable compensation arrangement with respect to the
          development of such commercial data products.  If the parties cannot
          agree on a mutually acceptable compensation arrangement within sixty
          (60) days from commencement of such negotiations, then the Company may
          offer the development rights to a third party at a price, which for
          purposes of this

5
<PAGE>

          section would include royalty payments, no more favorable than the
          price offered to Cahners.

     3.6  The Company and Cahners will jointly develop marketing announcements
          as follows:

          3.6.1  The parties will issue a mutually acceptable joint press
                 release within fifteen (15) business days of the Effective Date
                 announcing that they have entered into a joint marketing
                 agreement, which, among other things, provides for the
                 integration of certain products of Cahners and the Company; and

          3.6.2  Unless otherwise agreed to by the parties, the parties will
                 issue a joint capability statement within sixty (60) days of
                 the Effective Date announcing the functionality of the links
                 between PartMiner and e-inSITE.

     3.7  Each of the Company and Cahners will consider (but will not be
          obligated to) allowing the other party to participate in its tradeshow
          booth in at least three (3) tradeshows per year, including, but not
          limited to, the Design Automation Conference, the Wescon Show, and the
          Embedded Systems West Show.

     3.8  The Parties will work together in good faith to identify and create
          new content opportunities (e.g., real-time indices of part demand and
          consumption) to be used in the Products with appropriate editorials or
          other textual description.

     3.9  The Company will be responsible for and shall bear the expense of
          producing marketing materials for its use in connection with its
          relationship with Cahners. Cahners will select and provide Cahners
          materials for inclusion in the Company's marketing material at no cost
          to the Company.

     3.10 Neither party may disseminate or make available to third parties any
          marketing materials, brochures, pamphlets, flyers, users' manuals,
          "splash screens," or websites offering any of the other party's
          Products (including without limitation materials offering both
          parties' Products) without the prior written approval of the other
          party. The party which proposes to disseminate or make available any
          such material shall give notice of such desire to the other party and
          provide copies of the materials such party proposes to disseminate. If
          the non-disseminating party fails to respond to the disseminating
          party within five (5) business days of receiving such notice and
          materials, the non-disseminating party shall be deemed to consent to
          such dissemination. Any reproduction of Cahners' or the Company's
          trademarks, logos, symbols and other identifying marks must be true
          reproductions. Neither party shall remove, make, or permit

6
<PAGE>

          alterations to any labels or identifying markings placed by the other
          party on such party's products.

4.   Licenses granted.
     ----------------

     4.1  Cahners hereby grants to the Company a limited, nontransferable, non-
          exclusive, license to create interfaces to link PartMiner with e-
          inSITE:

          4.1.1  The Company shall pay Cahners a fee equal to one percent (1%)
                 of the total consolidated revenue received by the Company and
                 its affiliates from purchases of electronic components by
                 customers (i) through PartMiner, or (ii) who have accessed
                 PartMiner at least three (3) times during the calendar quarter
                 in which the customer's purchase was made. The Company will use
                 its best efforts to implement as soon as possible, at the
                 Company's cost and expense, the procedures and technology
                 necessary to identify and compute the fees due to Cahners
                 hereunder.

          4.1.2  The Company agrees that it will make the Cahners Content
                 available only to end-users of PartMiner and will not sell,
                 license or make available to redistributors, online aggregators
                 or other third parties all or any portion of the Cahners
                 Content, e-inSITE or the Cahners Publications, except as
                 otherwise permitted under this Agreement.

          4.1.3  Nothing in this Agreement shall be construed as giving the
                 Company any license or other rights with respect to e-inSITE,
                 the Cahners Content or the Cahners Publications, other than
                 those expressly granted in this Agreement. All rights not
                 expressly granted to the Company under this Agreement are
                 expressly reserved by Cahners.

     4.2  The Company hereby grants Cahners a limited, nontransferable, non-
          exclusive, royalty-free license to create interfaces to link e-inSITE
          with PartMiner:

          4.2.1  Cahners agrees that it will not sell, license or make available
                 to third parties all or any portion of PartMiner, except as
                 otherwise permitted under this Agreement.

          4.2.2  Nothing in this Agreement shall be construed as giving Cahners
                 any license or other rights with respect to PartMiner, other
                 than those expressly granted in this Agreement. All rights not
                 expressly granted to Cahners under this Agreement are expressly
                 reserved by the Company.

5.   Restrictions and Responsibilities.
     ---------------------------------

7
<PAGE>

     5.1  Cahners Restrictions.  During the term of this Agreement, without the
          --------------------
          prior written approval of the Company, which approval shall not be
          unreasonably withheld or delayed, Cahners will not: (i) acquire,
          develop or operate, alone or in conjunction with any company or
          entity, other than the Company, an Aggregated E-Commerce Web Site the
          primary focus of which is directed to the EOEM marketplace, which
          marketplace consists primarily of the computer, communications,
          industrial, and consumer electronics manufacturing industries
          (hereinafter in this Section 5.1 referred to as an "EOEM Aggregated E-
          Commerce Web Site"), and/or (ii) acquire, maintain, create, develop or
          generate an interface between e-inSITE and any EOEM Aggregated E-
          Commerce Web Site other than PartMiner. The foregoing provisions of
          this Section 5.1 shall not limit Cahners' ability to acquire any
          company, the operations of which would violate the foregoing
          provisions; provided that, Cahners shall use commercially reasonable
          efforts to cease such operations by merger or other consolidation of
          such operations with PartMiner, sale or discontinuance of such
          operations as soon as practicable, but in no event later than nine (9)
          months following such acquisition.

     5.2  Company Restrictions.  During the term of this Agreement, without the
          --------------------
          prior written approval of Cahners, which approval shall not be
          unreasonably withheld or delayed, the Company will not: (i) create an
          interface between its web site(s) and any web site serving as an
          editorial content provider or navigational hub for a network of web
          sites offering editorial content primarily focusing on the electronics
          components market, and /or (ii) create any web site serving as an
          editorial content provider or navigational hub for a network of web
          sites offering editorial content primarily focusing on the electronic
          components market or publish any print periodicals covering such
          subject matter; except for such printed promotional and marketing
          materials as may be necessary to promote registration or use of
          PartMiner. Notwithstanding the foregoing, any interface between
          PartMiner and IHS shall not be considered a breach of this Agreement.

     5.3  Definition of Interface.  For the avoidance of doubt, "interface" does
          -----------------------
          not include (A) advertisements placed by the Company or Cahners on
          third party web sites which link back to PartMiner (in the case of the
          Company), or back to a product of Cahners (in the case of Cahners);
          (B) advertisements by a third party on PartMiner or a Cahners web
          site, provided any links in connection with such advertisements are
          limited to links included within such advertisements and not elsewhere
          on the site on which the advertisement appears; (C) hyperlinks
          contained in editorial content or on-line directories, listings or
          databases; and nothing in this Agreement shall prevent either party
          from creating any of the foregoing with any third party.

8
<PAGE>

     5.4  Other Duties and Responsibilities.  The parties agree to coordinate
          ---------------------------------
          and take all reasonable precautions (consistent with the precautions
          it ordinarily takes to safeguard its own products) to safeguard the
          Products from piracy and misuse. Such precautions shall include,
          without limitation, password protection devices.

6.   Representations and Warranties, Liability Limitation.
     ----------------------------------------------------

     6.1  Each party represents and warrants to the other that it has full power
          and authority to enter into this Agreement.

     6.2  To its knowledge, the Company represents and warrants that PartMiner
          does not infringe or misappropriate any third party's rights,
          including intellectual property rights. Notwithstanding the foregoing,
          the Company makes no representations or warranties as to the continued
          availability or accessibility through PartMiner of any third party
          products or services. The Company will defend, indemnify and hold
          Cahners, its affiliates and their respective directors, officers,
          employees and agents harmless from and against, any and all judgments,
          claims, demands, causes of action, costs and expenses (including
          reasonable attorney's fees) arising from or related to any claims of
          third party infringement in connection with PartMiner, except for
          claims related to the availability or accessibility through PartMiner
          of any third party products or services.

     6.3  To its knowledge, Cahners represents and warrants that e-inSITE does
          not infringe or misappropriate any third party's rights, including
          intellectual property rights. Cahners will defend, indemnify and hold
          the Company, its affiliates and their respective directors, officers,
          employees and agents harmless from and against, any and all judgments,
          claims, demands, causes of action, costs and expenses (including
          reasonable attorney's fees) arising from or related to any claims of
          third party infringement related to e-inSITE.

     6.4  THE COMPANY UNDERSTANDS AND AGREES THAT, EXCEPT AS EXPRESSLY SET FORTH
          IN THIS AGREEMENT, E-INSITE AND THE CAHNERS CONTENT ARE OFFERED "AS
          IS," WITHOUT WARRANTIES OF ANY KIND, AND ALL WARRANTIES, WHETHER
          EXPRESS OR IMPLIED, ORAL OR WRITTEN, ARE HEREBY DISCLAIMED AND
          NEGATED, INCLUDING WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE AND
          MERCHANTABILITY.  CAHNERS UNDERSTANDS AND AGREES THAT, EXCEPT AS
          EXPRESSLY SET FORTH IN THIS AGREEMENT, PARTMINER IS OFFERED "AS IS,"
          WITHOUT WARRANTIES OF ANY KIND, AND ALL WARRANTIES, WHETHER EXPRESS OR
          IMPLIED, ORAL OR WRITTEN, ARE

9
<PAGE>

          HEREBY DISCLAIMED AND NEGATED, INCLUDING WARRANTIES OF FITNESS FOR A
          PARTICULAR PURPOSE AND MERCHANTABILITY.

     6.5  EXCEPT FOR CLAIMS INVOLVING THIRD PARTIES UNDER SECTION 6.2 OR 6.3, IN
          NO EVENT SHALL EITHER PARTY BE LIABLE TO THE OTHER OR TO ANY THIRD
          PARTY FOR ANY INDIRECT, SPECIAL, INCIDENTAL, PUNITIVE, CONSEQUENTIAL
          OR LOST PROFIT DAMAGES.

7.   Confidentiality and Intellectual Property Ownership.
     ----------------------------------------------------

     7.1  The parties agree to keep strictly confidential any and all
          information relating to the other party's products as well as the
          business and operations (including customer lists, sales and pricing
          schemes) of the other party hereto disclosed to the other party in
          connection with the transactions contemplated by this Agreement. The
          parties agree that all such confidential information shall remain the
          sole and absolute property of the party disclosing the same. During
          the term of this Agreement, or any extensions or renewals thereof, the
          parties shall not use, disclose, disseminate, publish, reproduce or
          otherwise make available such information to any person, firm,
          corporation, or other entity, except for the purposes contemplated
          hereby. Following expiration or earlier termination of this Agreement,
          neither party shall use, disclose, disseminate, publish, reproduce or
          otherwise make available such information to any person, firm,
          corporation or other entity. The terms of this Section 7.1 shall
          survive the termination of this Agreement. Notwithstanding anything in
          this Agreement, the confidentiality obligations of this Article 7 are
          subject to any applicable legal requirements or court or
          administrative order to which a party may be subject.

     7.2  The foregoing covenant of confidentiality shall not apply to: (i) any
          information in the public domain prior to the date of this Agreement,
          (ii) any information that enters the public domain subsequent to the
          date of this Agreement through no fault of the recipient thereof;
          (iii) any information that was in the possession of the recipient
          prior to the disclosure by the other party hereto without violating
          the terms of this Agreement; (iv) any information that is obtained
          from a third person that, to the knowledge of the recipient, had a
          right to disclose such information; (v) any information the recipient
          is otherwise permitted to use or disclose under the terms of this
          Agreement; and (vi) any information independently developed by the
          recipient without violating the terms of this Agreement.

     7.3  Nothing in this Agreement shall alter the ownership of or intellectual
          property rights in and to:  (i)  e-inSITE or the Cahners Content,
          which shall be and remain the sole and exclusive property of Cahners;
          or (ii)

10
<PAGE>

          PartMiner, which shall be and remain the sole and exclusive property
          of the Company. All use of the Company's and Cahners' trademarks shall
          inure to the benefit of the Company and Cahners, respectively. Any use
          of a party's marks or logos will be subject to the approval of such
          party, such approval not to be unreasonably withheld or delayed.

     7.4  Each party agrees that it will not use the confidential information of
          the other party for any purpose other than that authorized by this
          Agreement, nor disclose or make available the confidential information
          of the other party to third parties. Each party shall not, nor shall
          it allow a third party to, decompile, reverse engineer, disassemble,
          duplicate or otherwise reduce any code or functionality made available
          to it under this Agreement.

     7.5  The parties agree that the provisions of this Article 7 are necessary
          and reasonable to protect the Company and Cahners in the conduct of
          their businesses. Each party acknowledges that damages at law may be
          an inadequate remedy for the breach of any of the covenants contained
          in this Article 7 and, accordingly, in addition to any other remedies
          to which such party would be otherwise entitled, such party shall be
          entitled to injunctive relief for any breach or threatened breach by
          the other party of any of the provisions contained herein.

1.   Term and Termination.
-------------------------

     8.1  This Agreement shall commence on the Effective Date, and shall
          continue for an initial term of three (3) years from the sixtieth day
          after the Effective Date. Thereafter, this Agreement may be renewed
          for successive periods of three (3) years (or such lesser or greater
          term as the parties may agree in advance) upon mutual agreement of the
          parties.

     8.2  This Agreement may also be terminated by notice in accordance with the
          following:

          8.2.1  by either party hereto, upon the occurrence of a breach by the
                 other party of the provisions of Section 7.1 hereof;

          8.2.2  by either party hereto, upon the occurrence of a material
                 breach by the other party (other than breaches of Section 7.1
                 hereof), which breach is not cured within thirty (30) days
                 after receipt of written notice of the breach from the non-
                 breaching party; or

          8.2.3  by either party hereto, in the event the other party ceases to
                 function as a going concern, is adjudged a bankrupt or makes an
                 assignment for the benefit of creditors; or

11
<PAGE>

          8.2.4 by either party in the event the other party transfers or
                assigns, directly or indirectly, by operation of law (e.g.,
                merger, acquisition) or otherwise, all or a substantial portion
                of its assets, which in the case of Cahners includes the sale of
                all or substantially all of the assets of e-inSITE, to a
                competitor of the non-transferring party (including but not
                limited to, the parties listed on Exhibit F attached hereto); or
                                                  ---------

          8.2.5 by either party in the event the other party undergoes a change
                in control reasonably unacceptable to the other party. For
                purposes of this Agreement, a "change in control" shall mean a
                merger or consolidation in which the applicable party is not the
                surviving entity, or a sale of fifty percent (50%) or more of
                the assets or capital stock of either party.

8.3  Upon termination of this Agreement for any reason, each party shall disable
     and destroy all custom interfaces and links with the other party's product,
     and shall immediately return any and all property of the other party.
     Notwithstanding the foregoing, the parties shall have 180 days from the
     date notice of termination is received by the non-terminating party to
     remove any links between PartMiner and e-inSITE.

9.   Miscellaneous.
     -------------

     9.1  Each of the parties hereto agrees to execute instruments and take such
          further actions, if any, as may be reasonably requested by the other
          party in order to assure such requesting party of the rights and
          benefits intended by this Agreement, it being understood that the
          expense of any such action shall be borne by the party requesting the
          same.

     9.2  The relationship between the Company and Cahners established by this
          Agreement is solely that of independent contractors. Neither party is
          in any way the partner or agent of the other, nor is either party
          authorized or empowered to create or assume any obligation of any
          kind, implied or express, on behalf of any other party, without the
          express prior written consent of such party. The relationship created
          by this Agreement is not intended by the parties to constitute the
          granting of a franchise to one party by the other, and no federal or
          state law, regulation or rule relating to franchise is intended to be
          applicable to such relationship or this Agreement.

     9.3  This Agreement is the entire agreement between the parties hereto with
          respect to the subject matter hereof, and shall supersede any and all
          prior written or oral promises or representations.  No amendments or
          modifications of the terms of this Agreement shall be binding upon a
          party unless in writing signed by both parties.

12
<PAGE>

     9.4  Neither the waiver by a party hereto of any breach of or default under
          any of the provisions of this Agreement, nor the failure of a party to
          enforce any of the provisions of this Agreement or to exercise any
          rights hereunder, shall be construed as a waiver of any subsequent
          breach, or as a waiver of any such rights or provisions hereunder.

     9.5  If any part of this Agreement shall be held to be invalid or
          unenforceable under applicable law, such part shall be ineffective to
          the extent of such invalidity or unenforceability only, without in any
          way affecting the remaining parts of this Agreement.

     9.6  This Agreement shall be governed by and construed in accordance with
          the laws of the State of New York.  Each party irrevocably consents
          that any legal action or proceeding against it under, arising out of,
          or in any matter relating to this Agreement may only be brought in the
          federal and state courts in New York County, State of New York. Each
          of the parties hereto, by execution and delivery hereof, expressly and
          irrevocably assents and submits to the personal jurisdiction of any of
          such courts in any action or proceeding.

     9.7  Neither party may assign or transfer this Agreement in whole or in
          part without the prior written consent of the other party; provided,
                                                                     --------
          however, that either party may assign this Agreement to any purchaser
          -------
          of all of the stock or assets of the assigning party without the
          consent of the non-assigning party, which in the case of Cahners
          includes the sale of all or substantially all of the assets of e-
          inSITE; provided, that, (i) such purchaser is not, in the non-
          assigning party's sole judgment, a competitor of the non-assigning
          party, and (ii) such purchaser agrees to be bound by the terms of this
          Agreement.

     9.8  The headings contained in this Agreement are for reference purposes
          only and shall not affect in any way the meaning or interpretation of
          this Agreement.

     9.9  Any notices or other communications required or permitted hereunder
          must be in writing and shall be deemed given (a) on the third business
          day after mailing, if given by certified mail, return receipt
          requested, postage prepaid, (b) when sent if given by facsimile with
          confirmation, or (c) when personally delivered, addressed as follows,
          or to such other address as any party shall designate by notice duly
          given hereunder:

          If to the Company to:  PartMiner, Inc.
                    432 Park Avenue South
                    New York, New York  10016
                         Attn:   General Counsel
                    Facsimile No.: 212-592-5859

13
<PAGE>

          With a copy to:  Gould & Wilkie LLP
               One Chase Manhattan Plaza
               58th Floor
               New York, New York 10005
               Attn:  George J. Walsh, Esq.
               Facsimile No.:  212-809-6890

            -and-

          If to Cahners to:  Cahners Business Information
               275 Washington Street
               Newton, Massachusetts 02458
                         Attn: Chief Executive Officer and
                               Chief Legal Counsel
               Facsimile No.:  (617) 558-4622

          With a copy to:  Cahners Business Information
               1350 East Touhy Avenue
               Des Plaines, Illinois 60018
               Attn:  Brian Nairn
               Facsimile No.:  (847) 390-2200

     9.10   Any prevention of or delay in either party's performance hereunder
            due to labor disputes, acts of God, governmental restrictions, enemy
            or hostile governmental action, fire or other casualty or other
            causes beyond such party's control shall excuse such party's
            performance of its obligations hereunder for a period equal to the
            duration of any such prevention or delay. The foregoing provision
            shall not apply to and shall not justify a delay in making a
            required financial payment to the other party. Notwithstanding
            anything in this Agreement, any prevention of or delay in a party's
            performance hereunder which continues for ninety (90) days or more,
            regardless of the reason, shall entitle the other party to terminate
            this agreement without liability to the non-performing party, except
            for obligations to make payments under this Agreement which arose
            prior to the date of termination.

     9.11   The terms, covenants and provisions of this Agreement are binding on
            and shall inure to the benefit of the parties hereto and their
            respective successors and permitted assigns.

     9.12   This Agreement may be executed in counterparts each of which shall
            be deemed an original and all of which shall constitute one and the
            same agreement.

14
<PAGE>

IN WITNESS WHEREOF, the parties have executed this Agreement to be effective on
the Effective Date.

Cahners Business Information,           PartMiner, Inc.
a division of Reed Elsevier Inc.

     /s/ Brian Nairn                     /s/ Daniel Nissanoff
By:  ___________________________    By:  _____________________________________

       Brian Nairn                         Daniel Nissanoff
Name:___________________________    Name:  ___________________________________

       Chief Operating Officer             President & Chief Executive Officer
Title:__________________________    Title: ___________________________________

       September 10, 1999                  September 10, 1999
Date: __________________________    Date:  ___________________________________

15

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