Document:

[LETTERHEAD]
RK GRACE & C 0 M P A N Y

A GRACE SECURITIES CORPORATION
       WWW.RKGRACE.COM

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    1101 BRICKELL AVENUE

        SOUTH TOWER

         5TH FLOOR

      MIAMI, FL 33131

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        305.444.4403

      FAX 305.373.4790

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    INVESTMENT COUNSELORS

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           MEMBERS

    NASD -  SIPC  -  MSRB
                                                                January 14, 1999

Fullcomm, Inc.
Brendan G. Elliott
President
11 Chambers Street
Princeton, NJ 08542
Re: Memorandum of Understanding: Placement Agent and Financial
    Advisory Engagement

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

Board of Directors

Gentlemen:

We are pleased to submit the following proposal whereby R.K. Grace & Company
agrees to act as placement agent and financial advisor ("Agent/Advisor") to
Fullcomm, Inc. ("Fullcomm" or the "Company"), for purposes of this Agreement,
Fullcomm shall be deemed to include all affiliates of the Company. As
Agent/Advisor, R.K. Grace & Company will provide strategic and financial
advisory services including arranging debt and/or equity capital for the
Company. The services described herein shall be collectively referred to as the
"Engagement".

1.    Fullcomm Objectives

It is our understanding that Fullcomm's objectives with respect to its future
strategic development include the following:

(i)   to have Agent/Advisor review the final offering memorandum..

(ii)  to offer and sell up to USD $3 million, or such other amount as agreed
      upon, in a private placement(the "financing") of common stock of the
      Company, $.01 par value (the "securities"). Such private placement shall
      be pursuant to an exemption from registration under all applicable federal
      and state securities laws and regulations, including, but not limited to,
      Rule 506 promulgated under Regulation D of the Securities Act of 1933, and
      such private placement shall only be made to accredited investors defined
      under Rule 501(a) thereunder.

(iii) to file a registration statement within the next eighteen months to do an
      initial public offering of securities.

(iv)  to establish relationships with investors to purchase the Securities,
      and/or a strategic partner whose investment goals, objectives, operating
      philosophy, strategic direction or business are consistent with those of
      Fullcomm.

                                                                          /s/ JK

<PAGE>

2. General Services to be provided by the Agent/Advisor

      The Agent/Advisor shall provide various financial advisory and investment
      banking services, as reasonably requested by Fullcomm including:

(i)   anticipate future funding requirements;

(ii)  advising Fullcomm of the reasonableness of its business, operating
      forecasts and projections to be used to solicit prospective Investors;

(iii) helping Fullcomm develop and evaluate financial and strategic alternatives
      with respect to the Financing and subsequent capitalization;

(iv)  assisting Fullcomm as needed to negotiate various contracts, financial
      transactions, and other agreements in connection with strategic alliances
      and acquisitions;

(v)   providing such other financial advisory services as reasonably requested
      by Fullcomm from time to time in connection with its investment banking
      needs including corporate finance services and merger and acquisition
      advice.

3. Compensation with respect to the Financing:

      Fullcomm will compensate the Agent/Advisor as follows:

(i)   A cash fee equal to ten percent (10%) of the Gross Proceeds of money
      raised, this fee refers to the overall fee payable to an underwriting
      group which will include the lead underwriter together with any members of
      the selling group.

(ii)  A number of common stock purchase warrants (the "Placement Agents
      Warrants") equal to 10% of the shares sold in the Financing. The warrants
      shall be exercisable for a period of seven years from the initial closing
      date of the Financing. The exercise price of the Placement Agent Warrants
      shall be 110% of the offering price of the common stock. In the event that
      other than common stock is sold, the Company and the Placement Agent will
      mutually agree on an exercise price prior to the offering of such
      securities.

(iii) The Agent/Advisor shall be entitled to certain piggyback and demand
      registration rights with respect to such common shares underlying the
      Placement Agent Warrants. Such piggyback registration rights shall be as
      follows: (a) from the date hereof until one year from the date of the last
      closing of the Financing; such demand registration rights shall be as
      follows: (b) from one year from the date of the last closing of the
      Financing until two years from the date of the last closing of the
      Financing.

(iv)  A 2% non-accountable expense allowance payable in cash, based on the Gross
      Proceeds of money raised in the Financing.

(v)   Fullcomm will be responsible for the cost of printing expenses for the
      Financing memorandum, travel and related expenses. All such non-incidental
      expenses will be pre-approved by Fullcomm.

4. Merger & Acquisition Services:

                                                                          /s/ JK

<PAGE>

R.K. Grace & Company will advise Fullcomm with respect to the merger and/or
acquisitions of other companies and and/or the potential merger or acquisition
of Fullcomm(including the possible merger of Fullcomm and Contessa Corp.). R.K.
Grace & Company will receive a fee based on the aggregate purchase price or
value of the entity being acquired or merged with as follows: 5% of the first
ten million, 4% of the second ten million, 3% thereafter of the aggregate
purchase price for the company being acquired/merged. Such fee will be
payable(in cash or stock at the discretion of the Agent/Advisor) upon completion
of the merger or acquisition completed during the term of this agreement.

5. Board Seat

R.K. Grace & Company will have the right to designate one person to sit on the
parent company's(Contessa Corp.) Board of Directors for a period of two years
from the closing of the private placement. The Board will be no more than five
members, including R.K. Grace & Company's designee.

6. Information

Fullcomm will furnish the Agent/Advisor with such information ("Information")
as such Agent/Advisor believes appropriate to the Engagement during the period
of this Engagement, including any extended period. Fullcomm recognizes and
confirms that the Agent/Advisor:

(i)   will use and rely primarily on the Information and on publicly available
      information in performing the services contemplated by the Engagement
      without having independently verified same;

(ii)  does not assume responsibility for the accuracy or completeness of the
      Information and such other information;

(iii) will not make an appraisal of any assets of the Company.

To the best of Fullcomm's knowledge, the information to be furnished by Fullcomm
will be true and correct in all material respects and will contain all material
facts necessary to make the statements contained therein not misleading.
Fullcomm will promptly notify each Agent of its knowledge of any material
inaccuracy, change in facts, or misstatement in or material omission from, any
Information theretofore delivered to each such agent.

7. Confidentiality

      The Agent/Advisor agrees to keep confidential, and not to disclose to any
third parties without discussion with Fullcomm, the Information. With respect
to confidentiality, the Information shall be understood not to include:

(i)   publicly available information;

(ii)  information received from third parties who are not officers, employees or
      agents of the Company;

(iii) information required to be disclosed by applicable law, regulation,
      certified public accountant or court proceeding.

8. Authority, Modification, Governing Law

                                                                          /s/ JK

<PAGE>

      Fullcomm represents and warrants to the Agent/Advisor that it is
authorized to enter into this Engagement and to consummate the Financing. This
Engagement and the Agent/Advisor Indemnification Agreement and any other letter
attached hereto and made a part hereof, contain the entire agreement between the
parties hereto and may only be modified in writing by the parties hereto. This
agreement shall be interpreted and governed by the laws of the State of Florida.

9. Escrow

      The Agent/Advisor and the Company hereto agree that any proceeds raised in
the Financing shall be held in escrow by a mutually agreed upon FDIC insured
Bank, in a non-interest bearing escrow account pending each closing of the
Financing. In the event such Financing is not consummated then such proceeds
held in Escrow will be returned to such investors. Such proceeds held in Escrow
will require written instructions from both the Agent/Advisor and the Company
prior to disbursement.

10. Term

      This Agreement will be in effect for a one year period from the date of
signing.

11. Indemnification

      Fullcomm and Agent/Advisor will indemnify each other as follows:

(i) The Company agrees to indemnify and defend the Agent/Advisor and each
person, if any, who controls the placement agent within the meaning of Section
15 of the Securities Act free and harmless from and against any and all loses,
claims, damages, liabilities and expenses, joint or several(including reasonable
legal or other expenses) incurred by Agent/Advisor and controlling person in
connection with defending any claims or liabilities, whether or not resulting in
any liability to the Agent/Advisor or to any controlling person which the
Agent/Advisor or controlling person may incur under the Securities Act or at
common law or otherwise, but only to the extent that the losses, claims,
damages, liabilities and expenses shall arise out of or be based upon any untrue
statement, omission of material fact or alleged untrue statement of a material
fact contained in any of the offering documents.

(ii) The Agent/Advisor agrees to indemnify and defend Fullcomm from and against
any and all loses, claims, damages, liabilities and expenses in defending any
claims or liabilities, but only to the extent that the losses, claims, damages,
liabilities and expenses shall arise out of or be based upon any untrue
statement or other acts of negligence in any documents placed in writing with
respect to the offering by the Agent/Advisor.

(iii) The indemnity provisions contained in this section 10 shall survive the
any offering and shall inure to the benefit of the successors of any person who
controls the Agent/Advisor within the meaning of Section 15 of the Securities
Act, and shall be valid irrespective of any investigation made for on behalf of
the Agent/Advisor

12. Assignment

      The Company and the Representative agree in principle to the contents
hereof and plan to proceed on the terms set forth herein and in good faith to
finalize the offering. The agreement shall be binding upon and inure to the
benefit of the parties hereto and may not assigned by any party hereto.

                                                                          /s/ JK

<PAGE>

      Should the Representative fail to raise any funds within ninety days from
the signing of this Agreement, the Company will have the option to pursue any
other venues for raising capital.

      We look forward to working with you on the Engagement. If the above agrees
with your general understanding and intentions, please sign the enclosed copy of
this agreement.

                                          Sincerely,

                                          R.K. Grace & Company

                                          By    : /s/ John D. Kaweske
                                                 -------------------------------
                                          Name  :John D. Kaweske
                                          Title :Chief Executive Officer

Accepted and agreed to
as of the date first Above written

Fullcomm, Inc.

By    : /s/ Brendan G. Elliott
       -------------------------------
Name  : Brendan G. Elliott
Title : PresidentTashenberg Advisory Agreement
                    made as of the 17 day of February, 2000

      BETWEEN Fullcom, Inc., a New Jersey corporation (the "Company") with
offices at 11 Chambers Street, Princeton, New Jersey, Contessa Corporation, a
Delaware Corporation and Brad Tashenberg ("Consultant"), an individual with
offices at 4265 San Felipe, Houston, Texas 77027.

      WHEREAS Contessa Corporation ("Contessa") and the Company desire to merge
the Company with and into Contessa's wholly-owned subsidiary, Fullcomm
Acquisition Corp., whereby Acquisition shall be the surviving entity, and shall
change its name to Fullcomm, Inc. and whereby the transaction shall quality as a
tax free exchange pursuant to Section 351 of the Internal Revenue Code ("IRC");

      WHEREAS, in furtherance of such combination, the Boards of Directors
and/or shareholders of Contessa, Acquisition and the Company have each approved
the merger of Fullcomm with and into Acquisition (the "Merger"), upon the terms
and subject to the conditions set forth in the Merger Agreement and Plan of
Merger dated as of January 28, 2000 between the Company, Contessa, and certain
other parties (the "Merger Agreement"), in accordance with the applicable
provisions of the Delaware General Corporation Law (the "DGCL") and the New
Jersey Business Corporation Act (the "NJBCA").

      WHEREAS, the Company Shareholders desire to exchange all of their
ownership interest in the Company for shares of Contessa common stock on the
basis set forth in Section 1.2(c) of the Merger Agreement and in the respective
amounts set forth in Schedule 1.2 thereto as a tax free exchange pursuant to
Section 351 of the IRC; and

      WHEREAS, the execution of this Agreement is a condition to the Merger
taking place.

      NOW THEREFORE, the parties hereto agree as follows:

      1.    Duties. Company agrees to engage Consultant to provide, and
            Consultant agrees to provide, to the Company or to its designee,
            advisory services relating to the marketing of computer hardware
            security devices and strategic advisory services, all subject to the
            terms and conditions contained herein.

      2     No Consents or Conflicts. Consultant warrants to the Company that
            Consultant is in a position to provide such services in accordance
            with the provisions, and throughout the whole of the term, of this
            Agreement without the consent of any other party.

      3.    Term. The engagement shall commence from the effectiveness of the
            Merger referred to above and shall, subject to the provisions of
            Section 10, continue for a period of two (2) years.

                                       1
<PAGE>

      4.    Remuneration. Contessa shall issue to Consultant l75,000 shares of
            common stock for its services to be issued immediately upon the
            consummation of the Merger. Contessa and Consultant agree to take
            all actions necessary to ensure that in a dilutive transaction
            Consultant and the majority stockholders of Contessa at the time the
            Merger is consummated ("Majority Stockholders") will be diluted at
            the same proportionate rate and in any sale of substantially all of
            the assets or the majority of the stock of Consultant and the
            Majority Stockholders shall receive the same total compensation per
            share for their shares of stock in Contessa. Further, Consultant and
            the Majority Shareholders agree to enter into a shareholder's
            agreement with mutually agreeable terms, including but not limited
            to rights of first refusal.

      5.    Restricted Shares for Three (3) Years. It is understood and agreed
            that the above shares will not have been registered and will be
            "restricted" shares which are not freely tradeable, and may only be
            sold if registered under the Securities Act of 1933, as amended and
            appropriate "Blue Sky" provisions are observed. In addition, such
            shares shall be, and hereby are, restricted, and there shall be no
            transfer, pledge, or other alienation until three (3) years from the
            effective date of the Merger, except under any right of first
            refusal under a shareholders agreement.

      6.    Competition. Company and Contessa acknowledge that Consultant is
            involved in companies and activities that compete in the marketplace
            with the operations and technology of Company.

      7.    Non-Disclosure. Until the expiration of three (3) years following
            the date of this Agreement, each party agrees, to keep confidential
            and not disclose to any third party the terms of this Agreement and
            any information received from the other parties, representatives or
            advisors under this Agreement that is clearly labeled confidential.
            This non-disclosure obligation shall not apply to any information
            that was in the public domain prior to receipt or that becomes part
            of the public domain other than by the receiving party's breach of
            the provisions of this Agreement, was rightfully in the receiving
            party's possession prior to receipt or is received from a third
            party through no breach of any confidentiality obligation of the
            receiving party. In addition, the parties may disclose information
            to the extent required by the order of any court, administrative
            agency or pursuant to any requirement of law or to its employees,
            agents, and advisors to the extent reasonably necessary to carry out
            the subject matter of this Agreement, with the disclosing party
            taking all reasonable efforts to minmize the scope of disclosure and
            to prevent further dissemination.

      8.    Return of Property. Following the termination of its engagement
            hereunder, Consultant shall return to the Company on demand all
            items of property belonging to the Company or any other affiliated
            company or its or their customers or business associates which came
            into its possession during its engagement hereunder, including (but
            not limited to) lists of customers or clients, correspondence,
            documents, computer diskettes or files or other material, whether
            stored in written, electronic, digital or any other type of medium,
            which may be in its possession or under its control. Consu1tant
            shall refrain from removing or copying databases or commercial

                                       2
<PAGE>

            information of the Company which is not in the public domain, for
            the purpose of their subsequent commercial use for the benefit of
            any party or parties outside the Company without express consent and
            approval to that effect having been obtained from the Company's
            Board of Directors. Notwithstanding the above, Consultant shall be
            entitled to keep and own any and all if its work product generated
            during the term of this Agreement.

      9.    Termination. Notwithstanding the other provisions of this Agreement,
            either party shall be entitled to terminate the engagement
            established by this Agreement forthwith (but without prejudice to
            the accrued rights and liabilities of either party hereunder and
            Consultant's continuing obligations under Section 7 or 8) with or
            without cause at any time. If Company terminates this Agreement
            without cause, Consultant shall be entitled to retain all if the
            shares provided under Section 4. herein and shall be released from
            any restrictions on the sale thereof as soon as legally permitted by
            Rule 144, promulgated under the Securities Act of 1933 as amended
            and the "Blue Sky" provisions.

      10.   Notices. Any notice in writing to be served hereunder may be given
            personally to the Secretary of the Company or to Consultant or its
            representative as the case may be or may be posted to the office
            mentioned above of either party for the time being or may be posted
            to either party at their last known address. Any such notice sent by
            post shall be deemed served ten (10) calendar days after it is
            posted and in providing such notice it shall be sufficient to prove
            that the notice was properly addressed and put in the post. Notices
            may also be delivered by confirmed facsimile transmission.

      11.   Merger of prior agreements. This Agreement takes effect in
            substitution for all previous agreements and arrangements whether
            written, oral or implied between the Company and Consultant relating
            to Consultant's services and which agreements and arrangements shall
            be deemed to have been terminated by mutual consent as from the date
            of this Agreement.

      12.   Incorporation of Defined Terms. Capitalized terms not otherwise
            defined herein shall have the meaning ascribed to them in the Merger
            Agreement.

      13.   Miscellaneous. This Agreement shall be governed by the substantive
            law of New Jersey and each party hereto (i) waives trial by jury,
            (ii) submits to the jurisdiction of any court of general
            jurisdiction located within the state of New Jersey, or the federal
            district court resident therein, and (iii) waives any defense of
            inconvenient forum.

      14.   Condition Subsequent. It shall be a condition subsequent to the
            Company's and Contessa's obligations under this Agreement that the
            Merger referred to in the recitals shall have been consummated
            substantially in accordance with its terms. In the event that such
            Merger is not so consummated, Company shall have no further
            obligation hereunder except Company's obligations and agreements
            under Sections 7, 9 and 13 shall survive and remain in full force
            and effect and Consultant shall retain all rights to enforce such
            obligations. Further, in the event of such Merger not being

                                        3
<PAGE>

            consummated, Consu1tant's obligations and agreements under Sections
            7, 8, and 13 shall survive and remain in full force and effect, and
            Company shall retain all rights to enforce such obligations.

      IN WITNESS WHEREOF this Agreement of four (4) pages has been signed by or
on behalf of the parties hereto the day and year first before written.

FULLCOM, INC.                           CONTESSA CORPORATION

By:                                     By: /s/ Anthony Markofsky
    ----------------------------------      ----------------------------------
Name:                                   Name:   Anthony Markofsky
      --------------------------------        --------------------------------
Title:                                  Title:  Vice President
       -------------------------------         -------------------------------

/s/ Brad Tashenberg
--------------------------------------
Brad Tashenberg

                                       4
<PAGE>

            consummated, Consu1tant's obligations and agreements under Sections
            7, 8, and 13 shall survive and remain in full force and effect, and
            Company shall retain all rights to enforce such obligations.

      IN WITNESS WHEREOF this Agreement of four (4) pages has been signed by or
on behalf of the parties hereto the day and year first before written.

FULLCOM, INC.                           CONTESSA CORPORATION

By: /s/ Brendan G. Elliott              By:
    ----------------------------------      ----------------------------------
Name:   BRENDAN G. ELLIOTT              Name:
      --------------------------------        --------------------------------
Title:  PRESIDENT                       Title:
       -------------------------------         -------------------------------

/s/ Brad Tashenberg
--------------------------------------
Brad Tashenberg

                                        4

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