Document:

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                                                                   EXHIBIT  10.9

                           EMPLOYMENT AGREEMENT

This Employment Agreement (the "Employment Agreement"), made as of the 28th day
of May, 1998, by and between OPTICAL TECHNOLOGY GROUP, INC. d/b/a OTG SOFTWARE,
having its principal place of business at 6701 Democracy Blvd., #805, Bethesda,
MD 20817 (which, together with any affiliates or subsidiaries are hereinafter
referred collectively to as the "Corporation"), and Ronald W. Kaiser, an
individual residing at 306 Danmark Ct., Millersville, MD 21108-1459 (hereinafter
referred to as "Executive").

WITNESSETH

WHEREAS, the Corporation desires to employ the services of Executive under the
terms and conditions set forth herein; and

WHEREAS, Executive desires to provide services as Chief Financial Officer for
the Corporation under the terms and conditions set forth herein.

NOW, THEREFORE, in consideration of the promises and of the mutual covenants and
conditions contained herein, and with the intent to be legally bound hereby, the
Corporation and Executive hereby agree as follows:

1        EMPLOYMENT

1.1      EMPLOYMENT. The Corporation hereby agrees to employ Executive, and
         Executive hereby agrees to said employment, in accordance with the
         terms and conditions hereinafter set forth.

1.2      TERM. Employment hereunder shall commence on June 1, 1998, (the
         "Effective Date") and shall continue through May 31, 2001, unless

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         otherwise terminated pursuant to the terms of section 3 hereof, or
         otherwise extended by written agreement or continuation of this
         Employment Agreement upon such terms and conditions as are then
         mutually acceptable to the Executive and the Corporation.

1.3      LOCATION. The Corporation shall provide office space for Executive
         within its headquarters office area.

1.4      DUTIES. Executive shall begin employment with the title of Chief
         Financial Officer and serve as Chief Financial Officer of the
         Corporation and each operating affiliate, provided that Executive shall
         not be obligated to remain an officer of the Corporation or become or
         remain an officer of the Corporation affiliate whose organization
         documents do not provide indemnification provisions reasonably
         satisfactory to Executive. Executive shall also not be obligated to
         remain an officer of the Corporation or become or remain an officer of
         the Corporation affiliate which is not covered by the directors and
         officers' liability policy for all periods of Executive's employment
         beginning with the period immediately preceding a public offering by
         the Corporation. Executive shall report to and take direction from the
         President and Chief Executive Officer (the "CEO") of the Corporation.
         Executive shall perform management duties and shall otherwise perform
         all duties reasonably necessary and commensurate with the position of
         Chief Financial Officer. Executive shall devote full efforts as are
         reasonably required to fulfill his responsibilities, provided however
         that Corporation agrees that sufficient time shall be allowed Executive
         to fulfill Executive's responsibilities pursuant to the Transition
         Agreement dated April 28, 1998 as per section 2.5.

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2        COMPENSATION.

2.1      BASE SALARY. Executive shall be compensated by the payment of $165,000
         per annum ("Base Salary") in accordance with the Corporation's standard
         payroll practices for Executives at his level. Executive understands
         that all compensation paid shall be subject to the usual and customary
         federal and state tax withholding and other employment taxes as
         required by law. In the event Executive is terminated For Cause as
         defined in section 3.2 hereof, all compensation shall be prorated
         through the last day of Executive's employment if the "For Cause"
         termination is other than at the end of a calendar month.

         Executive will receive a salary review on January 1, 1999, and annually
         thereafter at the commencement of each calendar year. Any increase in
         the Base Salary will be based on the Corporation's performance as well
         as his individual contribution to that performance, and shall be
         determined at the sole discretion of the Corporation's CEO and Board of
         Directors.

2.2      BONUS COMPENSATION. In addition to the Base Salary, Executive shall
         receive a bonus equal to 25% of Base Salary ("Executive's Bonus")
         payable on a semi annual basis after the Effective Date of this
         agreement. Executive will receive a salary review on January 1, 1999,
         and annually thereafter at the commencement of each calendar year. Any
         increase in Executive's Bonus calculation will be based on the
         Executive's performance, and shall be determined at the sole discretion
         of the Corporation's Board of Directors.

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2.3      STOCK OPTION/EMPLOYEE EQUITY PLANS. In addition to the foregoing
         compensation, and subject to approval of the Corporation's Board of
         Directors, and in full compliance with all applicable state and federal
         securities laws, Executive shall also be issued options at the
         effective date of the adoption of a plan to purchase up to 1.4% of the
         sum of i.) shares of the issued and outstanding Common Stock of the
         Corporation and ii.) options authorized under any option plans or other
         option or warrant provisions of the Corporation (which together are
         hereinafter referred collectively to as the "Stock") upon the following
         terms and conditions (the "Initial Stock Options"). Such Initial Stock
         Options shall not be considered anti dilutive with regards to an
         initial public offering which is registered with the SEC pursuant to
         the Securities Act of 1933, but shall be considered "anti dilutive" in
         relationship only to ABS Capital transactions and to other equity
         transactions that result in dilution to shareholders by more than 15%,
         such that additional grants of stock options shall be made to Executive
         at the then effective fair market values as to cause his percentage
         ownership to remain at 1.4% of the combination of the "Stock" plus any
         additional stock issued or options or warrants authorized. Subject to
         the vesting requirements set forth herein, the Initial Stock Options
         shall be exercisable for ten (10) years after the Effective Date
         regardless of Executive's employment status with the Corporation.
         Executive expressly understands that the Stock will be "restricted
         stock," and may not be traded or sold except subject to applicable
         state and federal securities laws. Corporation represents and agrees
         that it will use best efforts to cause Initial Stock Options to be
         registered following an initial public offering by the Corporation.

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         The exercise price of the Initial Stock Options will be at the purchase
         price equal to that implicit in the Corporation's current financing
         transaction with ABS Capital, et al. The Initial Stock Options will
         vest 8% on March 1, 1999, 25% on the first anniversary of the Effective
         Date of this agreement, and 1.86111% in equal monthly amounts on a
         monthly basis over the 36 months following the first anniversary of
         this agreement. Notwithstanding the above, 100% of the Executive's
         Initial Stock Option shall vest in the event that the Corporation has a
         Change of Control. A "Change of Control" for purposes of this agreement
         shall be defined as a sale of more than 50% of the Corporation's stock
         or of the majority of the Corporation's operating assets to a third
         party. Except as otherwise expressly provided herein, the Initial Stock
         Options shall not be deemed earned for any vesting period after
         Executive voluntarily leaves the Corporation's employ or for any period
         after Executive is terminated For Cause as defined in section 3.2
         hereof.

         The Corporation anticipates that it will formulate and implement other
         Stock Option Plans and bonus plans in which Executives of the
         Corporation will participate. While not yet formal, if and when such
         plans are established by the Corporation, the Executive will be
         included along with other key executive members of the Corporation and
         its operating affiliates and shall participate as determined by the
         Corporation's Board of Directors and/or the appropriate Corporation
         committee charged with the responsibility of administering the Plan(s).

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2.4      OTHER BENEFITS

2.4.1    PAID VACATION. Executive shall be entitled to reasonable paid vacation
         time as agreed upon by Executive and the Corporation, or as otherwise
         provided pursuant to established policies of the Corporation for other
         senior executive officers, provided however, that it shall not be less
         than three weeks paid vacation per year. Such paid vacation time shall
         not be charged for Executive's time spent in satisfaction of continuing
         professional education.

2.4.2    HEALTH INSURANCE. During the term of this Agreement, the Corporation
         shall pay all premiums for health insurance for Executive and his
         family.

2.4.3.   EXPENSE REIMBURSEMENT. Upon submission of appropriate written expense
         reports, receipts or other substantiating evidence, Executive shall be
         entitled to reimbursement for all expenses incurred by Executive in the
         performance of his duties hereunder and/or the furtherance of the
         Corporation's business, including reimbursement for cellular/mobile
         phone expenses and for participation in Executive's professional
         associations.

2.4.4    OTHER PAYMENTS AND BENEFITS. In addition to the compensation and other
         consideration provided in section 5 above, Executive shall also receive
         the following additional benefits:

a.       The Corporation will reimburse the Executive for reasonable actual
         costs to relocate his personal goods closer to the Corporation's
         headquarters area at any time during Executive's employment. In
         addition, Corporation

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         will reimburse any additional costs associated with relocation as
         agreed to by the CEO and Executive at the time of relocation planning.

b.       Executive shall be entitled to and receive all other benefits and
         privileges offered to other senior executives of the Corporation.

2.5.     EXECUTIVE AND CORPORATION REPRESENTATIONS. The Executive hereby
         represents and warrants to the Corporation that he is a party to the
         Transition Agreement dated April 28, 1998, a copy of which is attached
         and that the Executive is not a party to any other written employment
         agreement with any other party. Executive and Corporation hereby
         represent and warrant that (i) the execution, delivery and performance
         of this Agreement by Executive does not and will not be effected such
         that it is or will be in conflict with, breach, violate or cause a
         default under the Transition Agreement dated April 28, 1998. The
         Corporation hereby represents that it will maintain directors' and
         officers' liability insurance covering Executive pursuant to section
         1.4 of this agreement. The Corporation further represents that its
         charter and by-laws have indemnification provisions to the fullest
         extent permissible under applicable corporate statutes.

3.       TERMINATION

3.1      Notwithstanding the terms of employment as contained in the foregoing
         sections, Executive and/or the Corporation may terminate Executive's
         employment with the Corporation, as otherwise set forth below:

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3.2      TERMINATION BY THE CORPORATION FOR CAUSE. The Corporation may terminate
         Executive with and for cause should Executive willfully breach the
         restrictions, obligations or duties which he is required to satisfy or
         perform under this Agreement or engage in any of the acts specified in
         Exhibit A hereto. Executive's termination for cause hereunder shall be
         effective five days following receipt by Executive of written notice of
         termination with the reason for termination specified therein. Vesting
         of options shall cease as of the effective date of Executive's
         termination for cause hereunder.

3.3      TERMINATION BY THE CORPORATION WITHOUT CAUSE. The Corporation may
         terminate Executive in connection with a Change of Control or without
         cause provided the Corporation delivers to Executive written notice
         thereof 60 days prior to the actual date of termination. In the event
         Executive is terminated in connection with a Change of Control or
         without cause prior to the first annual anniversary date of the
         Effective Date, Executive shall be paid a severance amount equal to six
         months of Executive's then current Base Salary, payable over a six
         month period commencing on the 61st day following Executive's receipt
         of the above written notice of termination in connection with a Change
         of Control or without cause. In the event Executive is terminated in
         connection with a Change of Control or without cause after the first
         annual anniversary date of the Effective Date, Executive shall be paid
         a severance amount equal to twelve months of Executive's then current
         Base Salary, payable over a twelve month period commencing on the 61st
         day following Executive's receipt of the above written notice of
         termination in connection with a Change of Control or without cause.
         Vesting of Executive's Initial Stock Options and the Corporation's
         provision for

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                  Executive's medical benefits shall continue through the period
                  Executive receives such severance amount following Executive's
                  receipt of the above notice of termination in connection with
                  a Change of Control or without cause.

        3.4       TERMINATION BY EXECUTIVE. Executive may terminate this
                  Agreement upon providing the Corporation with 60 days prior
                  written notice thereof for any reason. Executive may terminate
                  this Agreement for cause if the Corporation is in material
                  breach of any of its obligations hereunder and such breach is
                  not cured, within thirty (30) days' written notice thereof
                  from Executive, after expiration of such 30 day notice period.
                  A material change in Executive's responsibilities or
                  obligations under this Employment Agreement or a material
                  reduction in Executive's Base Salary without Executive's
                  consent shall be deemed a material breach of this Employment
                  Agreement by the Corporation.

 4.               PROTECTION OF CONFIDENTIAL INFORMATION

       4.1        Executive recognizes and acknowledges that he will have access
                  to confidential, proprietary and/or sensitive business
                  information, including but not limited to actual and potential
                  customer information, marketing information, financial
                  information, techniques, proprietary data and trade secrets of
                  the Corporation (hereinafter all forms of information
                  referenced above shall collectively be referred to as
                  "Protected Information); and that such Protected Information
                  constitutes valuable, special, and unique property of the
                  Corporation.

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         4.2      During or after the term of his employment by the Corporation,
                  Executive will not make any unauthorized use of, will not
                  disclose and will maintain in secrecy and in confidence, as
                  the secret and sole property of the Corporation, the Protected
                  Information. Executive will not, in any event, disclose or use
                  any Protected Information unless Executive receives specific
                  permission from the CEO of the Corporation to disclose or use
                  such Protected Information; and Executive will disclose or use
                  such information only as directed or permitted by the
                  Corporation. Upon termination of his employment for any
                  reason, Executive shall promptly deliver to the Corporation
                  all documents, computer software, drawings, manuals, letters,
                  notes, notebooks, reports and all other material and records
                  of any kind pertaining to Protected Information which have
                  been acquired by Executive during the term of his employment.

         4.3      Executive acknowledges that a breach of the terms of this
                  Section 4 will cause immediate and irreparable harm to the
                  Corporation, and money damages may not be sufficient to
                  compensate the Corporation for a breach. In the event of a
                  breach or threatened breach of the provisions of this Section
                  4, the Corporation shall be entitled to an injunction
                  restraining Executive from disclosing and/or using, in while
                  or in part, such Protected Information. Nothing contained
                  herein shall be construed as prohibiting the Corporation from
                  pursuing any other remedy for such breach or threatened
                  breach, including the recovery of damages from Executive.

         4.4      The provisions of this section shall survive any termination
                  of Executive's employment.

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5.       NON-COMPETITION

         5.1      During the term of his employment with the Corporation, and
                  for a period of two years immediately following the
                  termination of his employment for any reason whatsoever, or,
                  if Executive's employment with the Corporation has been for a
                  shorter period than two years, for a time period equal to
                  Executive's employment period with the Corporation (such two
                  year or shorter employment period being hereinafter referred
                  to as the "Restrictive Period"), Executive will not either
                  directly or indirectly be connected with the management,
                  operation or control of any Conflicting Organization (as
                  defined in Section 5.1.1) doing business within the United
                  States.

         5.1.1    "Conflicting Organization" means any person or organization
                  which is engaged in or is about to become engaged in research
                  on or the development, production, marketing or sale of any
                  Conflicting Product or Service. "Conflicting Product or
                  Service" means any product or service of any person or
                  organization which is the same as or similar to or improves
                  upon a product or service of the Corporation about which
                  Executive acquired Protected Information as a result of
                  employment by the Corporation.

         5.2      During the term of his employment with the Corporation and
                  during the Restrictive Period, Executive's obligations under
                  subsection 5.1 shall specifically include but not be limited
                  to the agreement by Executive not, either directly or
                  indirectly, to call on or solicit, or to attempt to call on or
                  solicit, in any manner which could have the effect of taking
                  away, or attempting to take away, any of the customers of the
                  Corporation with

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         whom he became acquainted during his employment with the Corporation,
         either for himself or for any other person, firm, corporation or other
         entity. The term "customer" shall include, but not be limited to, both
         existing and prospective customer during the term of Executive's
         employment.

5.3      During the term of his employment with the Corporation and for a two
         year period following Executive's termination of his employment with
         the Corporation, Executive shall not, either directly or indirectly,
         enter into an agreement with, or solicit or offer employment to,
         employees of the Corporation for the purpose of causing them to leave
         the employment of the Corporation, provided however that if employees
         of the Corporation respond to advertisements placed by Executive
         directly or indirectly, Executive shall not be in violation of this
         section 5.

5.4      The provisions of this Section 5 shall survive any termination of this
         Agreement, Executive acknowledges that a breach of the terms of this
         Section 5 will cause immediate and irreparable harm to the Corporation,
         and money damages may not be sufficient to compensate the Corporation
         for a breach. In the event of a breach or threatened breach of the
         provisions of this Section 5, the Corporation shall be entitled to an
         injunction restraining or mandating action by Executive to enforce the
         terms hereof; and nothing contained herein shall be construed as
         prohibiting the Corporation from pursuing any other remedy for such
         breach or threatened breach, including the recovery of damages from
         Executive.

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6.       INVENTIONS/DESIGNS/IMPROVEMENTS

6.1      Executive recognizes and acknowledges that during the course of his
         employment, he may either individually or jointly with others, and
         either on behalf of the Corporation or on his own, discover, conceive,
         make, perfect or develop inventions, improvements, discoveries,
         patents, patent applications, design patents, models, prototypes, trade
         secrets, computer programs, ideas, techniques, know-how and data,
         technical or otherwise, that are related to or in furtherance of the
         business or activities of the Corporation (hereinafter collectively
         referred to as "Inventions"). Inventions which are related to or in
         furtherance of the business or activities of the Corporation include
         any business or activity in progress at the Corporation at the date of
         or during Executive's employment with the Corporation and projects or
         other operations at the Corporation planned for the future.

6.2      Executive further recognizes and agrees that any and all Inventions,
         including all Invention related rights in patents, patent applications,
         design patents, models, prototypes, copyrights, registrations, trade
         secrets and any and all right, title and interest that he might have
         therein which are developed during his employment with the Corporation,
         are the sole and exclusive property of the Corporation. Executive
         agrees that any participation by Executive in the design, discovery,
         conception, production, perfection, development or improvement of an
         invention by Executive related to or in furtherance of the business or
         activities of the Corporation is work done for hire for the sole and
         exclusive  benefit of the Corporation; and Executive hereby assigns to
         the Corporation all of his rights, title and interest in and to any and
         all Inventions. Executive's

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         obligations under this Section 6 apply without regard to whether the
         Invention or an idea of an Invention, or the design, conception,
         production, perfection, development or improvement of an Invention,
         occurs on the job, at home, or elsewhere.

6.3      Executive also agrees to disclose and does hereby assign to the
         Corporation any and all Inventions conceived, made, perfected and
         developed, and any and all patent and copyright applications filed,
         during the six months immediately subsequent to the termination of his
         employment, whether such applications are made individually or jointly
         with others, so long as those inventions and applications relate to the
         subject matter of Executive's employment on behalf of the Corporation
         during the one-year period immediately preceding termination of said
         employment.

6.4      At the Corporation's request, from time to time, Executive shall
         promptly sign and deliver all documents necessary to vest in the
         Corporation all of his right, title and interest in and to such
         Inventions and, at the Corporation's request and expense, shall assist
         the Corporation in obtaining and defending any patents, or copyright
         registrations, or any other form of protection accorded to such
         Inventions in the United States or anywhere throughout the world, and
         shall assign the same and any patents issued thereon or copyright or
         registrations granted thereon, to the corporation.

6.5      Executive acknowledges that a breach of the terms of this Section 6
         will cause immediate and irreparable harm to the Corporation, and money
         damages may not be sufficient to compensate the Corporation for a

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         breach. In the event of a breach or threatened breach of the provisions
         of this Section 6, the Corporation shall be entitled to an injunction
         restraining or mandating action by Executive to enforce the terms
         hereof; and nothing contained herein shall be construed as prohibiting
         the Corporation from pursuing any other remedy for such breach or
         threatened breach, including the recovery of damages from Executive.

7.       MISCELLANEOUS

7.1      GOVERNING LAW. The Agreement shall be subject to and governed by the
         internal laws of the State of Maryland without regard to its conflict
         of laws provisions, and without regard to the place of execution or
         the place of performance thereof.

7.2      WAIVER. Failure to insist upon strict compliance with any provision
         hereof shall not be deemed a waiver of such provision or any other
         provision hereof.

7.3      AMENDMENT. This Agreement may not be modified or amended except by an
         agreement in writing executed by the parties hereto.

7.4      SEVERABILITY. If any one or more of the provisions contained in this
         Agreement shall, for any reason, beheld to be excessively broad as to
         time, duration, geographical scope, activity, or subject, it shall be
         construed by limiting and reducing it so as to be enforceable to the
         extent compatible with the applicable law. If any provision of this
         Agreement is contrary to any federal, state, or local statute,
         ordinance, or regulation, the parties

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         hereby declare that such provision shall be amended to conform to any
         such statutory or regulatory provision; and the invalidity or
         unenforceability of any provision hereof shall not affect the validity
         or enforceability of any other provision. The remaining provisions
         shall remain in full force and effect as if the Agreement had been
         executed with the invalid or unenforceable provisions eliminated.

7.5      ENTIRE AGREEMENT. This Agreement, together with Exhibit A hereto,
         constitutes the entire understanding between the Corporation and
         Executive with respect to the subject matter hereof and supersedes any
         and all previous agreements and understandings between Executive and
         the Corporation concerning the subject matter hereof.

7.6      NON-DISCLOSURE. Executive shall not disclose or confirm to any third
         party the existence of, or any material term contained in, this
         Agreement (other than disclosure and discussion with legal counsel,
         accountants,  Executive's immediate family or such other professional,
         governmental unit or court as is reasonably deemed necessary by
         Executive, which is permitted); and any such non permitted disclosure,
         if due to the Executive's actual willful act or gross negligence, shall
         subject the Executive to termination for cause pursuant to Section
         1.4.2 above.

7.7      COUNTERPARTS. This Employment Agreement may be executed in one or more
         counterparts, each of which shall be deemed an original, but all of
         which together shall constitute one and the same instrument. This
         Employment Agreement shall become effective upon the execution of
         counterpart hereof by each of the parties hereto.

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8.       NO ASSIGNMENT

         Executive may not assign his rights and/or obligations hereunder.

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

                              FOR:
                              OPTICAL TECHNOLOGY GROUP, INC.
                              ("Corporation"),

                              by:   /s/ RICHARD A. KAY
                                 ------------------------------------
                                 Richard A. Kay, President

                              by:  /s/ RONALD W. KAISER
                                 ------------------------------------
                                 Ronald W. Kaiser ("Executive")

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                 APPENDIX "A" TO EXECUTIVE EMPLOYMENT AGREEMENT

                       Reasons for Termination with Cause

    1.   Misappropriation of Corporation funds

    2.   Embezzlement of Corporation funds

    3.   Soliciting of a customer's business for personal or personally
         competitive gain.

    4.   Use or sale of illegal drugs in the work place.

    5.   Physical/mental/sexual abuse of any employee of the Corporation

    6.   Theft or destruction of Corporation property

    7.   Conviction of criminal activity in the workplace

    8.   Flagrant violation of written Corporation procedures/policies.

    9.   Providing professional services to a competitor while in the employ
         of the Corporation without the Corporation's knowledge.

    10.  Use of Corporation information for material personal gain

    11.  Breach of any covenant or obligation contained in Section 6 of the
         Agreement.

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             AMENDMENT NO. 1 TO THE EMPLOYMENT AGREEMENT MADE AS OF
             MAY 28,1998, BY AND BETWEEN OPTICAL TECHNOLOGY GROUP,
                  INC. D/B/A OTG SOFTWARE AND RONALD W. KAISER
                  (THE "EMPLOYMENT AGREEMENT - AMENDMENT 1").

Whereas, the Corporation and Executive desire to amend the Employment Agreement
pertaining to the employment of the Executive by the Corporation, Corporation
and Executive hereby agree that:

1.   Effective January 1, 1999, Section 2.1 of the Employment Agreement shall
     be amended such that Executive's Base Salary shall be $187,000 per annum,
     instead of $165,000.

2.   Effective January 1, 1999, Section 2.2 of the Employment Agreement shall be
     amended such that Executive's Bonus shall be 30% of Base Salary, instead of
     25% of Base Salary.

3.   Corporation and Executive acknowledge that Corporation has charged its name
     to "Online Technologies Group, Inc.". All other terms and conditions of the
     Employment Agreement shall remain in effect as provided for in the
     Employment Agreement.

In Witness whereof, the parties have executed this amendment as of September
15, 1999.

For:                       Optical Technology Group Inc. ("Corporation") by:

                              /s/ RICHARD A. KAY
                           ------------------------------------------------
                           Richard A. Kay, President

                           Executive, Ronald W. Kaiser, by:

                              /s/ RONALD W. KAISER
                           ------------------------------------------------
                           Ronald W. Kaiser

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                                Ronald W. Kaiser
                               306 Danmark Court
                          Millersville, Maryland 21108

                               December 23, 1999

OTG Software, Inc.
6701 Democracy Boulevard
Bethesda, Maryland 20817

          Re: Employment Agreement dated May 28, 1998

Gentlemen:

     Reference is made hereby to the Employment Agreement dated May 28, 1998
(the "Agreement") between the undersigned Ronald W. Kaiser ("Executive") and
Optical Technology Group, Inc. d/b/a OTG Software, now known as OTG Software,
Inc. (the "Company"). The second sentence of Section 2.3 of the Agreement
provides to the Executive certain rights to be granted additional options to
purchase stock of the Company under circumstances specified therein (the
"Antidilution Rights"). In order to facilitate an initial public offering of
the common stock of the Company, which the executive acknowledges will increase
the value of his existing stock options, and for other good and valuable
consideration, the Executive hereby (a) acknowledges that no events have
occurred as of the date of this letter that have triggered or would trigger his
Antidilution Rights, (b) agrees that the Antidilution Rights do not apply to
and are not triggered by a registered initial public offering of common stock
by the Company (an "IPO") and (c) agrees that the Antidilution Rights will
terminate upon the closing of an IPO.

     Except as modified hereby, the Agreement is hereby confirmed to be in full
force and effect. Please indicate your agreement to the modifications of the
Agreement set forth above by signing the enclosed copy of this letter and
returning it to the undersigned.

                                   /s/ Ronald W. Kaiser
                                   ----------------------------------
                                   Ronald W. Kaiser

AGREED:

OTG SOFTWARE, INC.

By: /s/ Richard Kay
    ---------------------------
    Name:
    Title:

Date:  12/23/93
      -------------------------<PAGE>   1
                                                                   EXHIBIT 10.11

                          REGISTRATION RIGHTS AGREEMENT

This Agreement dated as of June 9, 1998, is entered into by and among Optical
Technology Group, Inc., a Delaware corporation (the "Company"), Richard A. Kay
("Kay"), F. William Caple ("Caple"), Alexandra Kay ("A. Kay") and ABS Capital
Partners II, L.P., Michael P. Murray and Greylock IX Limited Partnership (the
"Purchasers").

WHEREAS, the Company and the Purchasers have entered into a Note Purchase
Agreement of even date herewith (the "Purchase Agreement"); and

WHEREAS, the Company and the Purchasers desire to provide for certain
arrangements with respect to the registration of shares of capital stock of the
Company under the Securities Act of 1933;

NOW, THEREFORE, in consideration of the mutual promises and covenants contained
in this Agreement, the parties hereto agree as follows:

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

          "Commission" means the Securities and Exchange Commission, or any
other Federal agency at the time administering the Securities Act.

          "Common Stock" means the common stock, $0.01 par value per share, of
the Company.

          "Exchange Act" means the Securities Exchange Act of 1934, as amended,
or any similar Federal statute, and the rules and regulations of the Commission
issued under such Act, as they each may, from time to time, be in effect.

          "Existing Holders" means Kay, Caple and A. Kay.

          "Existing Holders Registrable Shares" means (i) shares of Common Stock
now owned or hereafter acquired by the Existing Stockholders and (ii) any other
shares of Common Stock issued in respect of such shares (because of stock
splits, stock dividends, reclassifications, or similar events); provided,
however, that shares of Common Stock that are Existing Holders Registrable
Shares shall cease to be Existing Holders Registrable Shares (i) upon any sale
pursuant to a Registration Statement or Rule 144 under the Securities Act, (ii)
on the date that is two (2) years from the date when such shares may be sold
under Rule 144(k) under the Securities Act or (iii) upon any sale in any manner
to a person or entity which, by virtue of Section 14 of this Agreement, is not
entitled to the rights provided by this Agreement.

          "Notes" shall have the meaning specified in Subsection 1.2 of the
Purchase Agreement.

<PAGE>   2

          "Purchaser Registrable Shares" means (i) the shares of Common Stock
issued or issuable upon conversion of the Notes and (ii) any other shares of
Common Stock issued in respect of such shares (because of stock splits, stock
dividends, reclassifications, recapitalizations, or similar events); provided,
however, that shares of Common Stock which are Purchaser Registrable Shares
shall cease to be Registrable Shares (i) upon any sale pursuant to a
Registration Statement or Rule 144 under the Securities Act, (ii) on the date
that is two (2) years from the date when such shares are eligible for sale under
Rule 144(k) under the Securities Act or (iii) upon any sale in any manner to a
person or entity not entitled to the rights provided by this Agreement. Wherever
reference is made in this Agreement to a request or consent of holders of a
certain percentage of Registrable Shares, the determination of such percentage
shall include shares of Common Stock issuable upon conversion of the Notes even
if such conversion has not yet been effected.

          "Registration Statement" means a registration statement filed by the
Company with the Commission for a public offering and sale of Common Stock
(other than a registration statement on Form S-8 or Form S-4, or their
successors, or any other form for a similar limited purpose, or any registration
statement covering only securities proposed to be issued in exchange for
securities or assets of another corporation).

          "Registration Expenses" means the expenses described in Section 5.

          "Registrable Shares" means collectively the Existing Holders
Registrable Shares and the Purchaser Registrable Shares.

          "Securities Act" means the Securities Act of 1933, as amended, or any
similar Federal statute, and the rules and regulations of the Commission issued
under such Act, as they each may, from time to time, be in effect.

          "Stockholders" means collectively the Existing Holders and the
Purchasers.

     2.   Required Registrations.

          (a)  At any time after the earlier of June 9, 2000, or the closing of
the Company's first underwritten public offering of shares of Common Stock
pursuant to a Registration Statement, (i) a Stockholder or Stockholders holding
in the aggregate at least 50% of the Existing Holders Registrable Shares may
request, in writing, that the Company effect the registration on Form S-1 or
Form S-2 (or any successor form) of Existing Holders Registrable Shares owned by
such Stockholder or Stockholders that is either at least 25% of the Existing
Holders Registrable Shares or with an aggregate offering price of at least
$10,000,000 (based on the then-current market price or the reasonably
anticipated price to the public) and (ii) a Stockholder or Stockholders holding
in the aggregate at least 50% of the Purchaser Registrable Shares may request,
in writing, that the Company effect the registration on Form S-1 or Form S-2 (or
any successor form) of Purchaser Registrable Shares owned by such Stockholder or
Stockholders that is either at least 25% of the Purchaser Registrable Shares or
with an aggregate

                                      -2-
<PAGE>   3

offering price of at least $10,000,000 (based on the then-current market price
or the reasonably anticipated price to the public). If the holders initiating
the registration intend to distribute the Registrable Shares by means of an
underwriting, they shall so advise the Company in their request and the Company
shall have the right to approve the underwriter, which approval shall not be
unreasonably withheld. In the event such registration is underwritten, the right
of other Stockholders to participate shall be conditioned on such other
Stockholders' participation in such underwriting. Upon receipt of any such
request, the Company shall promptly give written notice of such proposed
registration to all Stockholders. Such Stockholders shall have the right, by
giving written notice to the Company within 30 days after the Company provides
its notice, to elect to have included in such registration such of their
Registrable Shares as such Stockholders may request in such notice of election;
provided that if the underwriter (if any) managing the offering determines that,
because of marketing factors, all of the Registrable Shares requested to be
registered by all Stockholders may not be included in the offering, then all
Stockholders who have requested registration shall participate in the
registration pro rata based upon the number of Registrable Shares which they
have requested to be so registered. Thereupon, the Company shall, as
expeditiously as possible, use its best efforts to effect the registration on
Form S-1 or Form S-2 (or any successor form) of all Registrable Shares which the
Company has been requested to so register.

          (b)  At any time after the Company becomes eligible to file a
Registration Statement on Form S-3 (or any successor form relating to secondary
offerings), a Stockholder or Stockholders may request the Company, in writing,
to effect the registration on Form S-3 (or such successor form), of Registrable
Shares having an aggregate offering price of at least $1,000,000 (based on the
then current public market price). Upon receipt of any such request, the Company
shall promptly give written notice of such proposed registration to all
Stockholders. Such Stockholders shall have the right, by giving written notice
to the Company within 30 days after the Company provides its notice, to elect to
have included in such registration such of their Registrable Shares as such
Stockholders may request in such notice of election; provided that if the
underwriter (if any) managing the offering determines that, because of marketing
factors, all of the Registrable Shares requested to be registered by all
Stockholders may not be included in the offering, then all Stockholders who have
requested registration shall participate in the registration pro rata based upon
the number of Registrable Shares which they have requested to be so registered.
Thereupon, the Company shall, as expeditiously as possible, use its best efforts
to effect the registration on Form S-3 (or such successor form) of all
Registrable Shares which the Company has been requested to so register. The
Company shall have the right to approve any underwriter, which approval shall
not be unreasonably withheld (if any) chosen to underwrite any such registration
on Form S-3 (or any such successor form).

          (c)  The Company shall not be required to (i) effect at the request of
any holder of Existing Holders Registrable Shares more than three registrations
pursuant to paragraph (a) above or more than three registrations pursuant to
paragraph (b) above or (ii) to effect at the request of any holder of Purchaser
Registrable Shares more than three registrations pursuant to paragraph (a) above
or more than three registrations pursuant to paragraph (b) above. In addition,
the Company shall not be required to effect any registration (other than on Form
S-3 or any successor form relating to secondary offerings) within six months
after the effective date of any other Registration Statement of the Company,
except that such time period will be twelve months in the case of an initial
public offering of shares by the Company.

                                      -3-
<PAGE>   4

          (d)  If at the time of any request to register Registrable Shares
pursuant to this Section 2, the Company is engaged or has fixed plans to engage
within 30 days of the time of the request in a registered public offering as to
which the Stockholders may include Registrable Shares pursuant to Section 3 or
is engaged in any other activity which, in the good faith determination of the
Company's Board of Directors, would be adversely affected by the requested
registration to the material detriment of the Company, then the Company may at
its option direct that such request be delayed for a period not in excess of 150
days from the effective date of such offering or the date of commencement of
such other material activity, as the case may be, such right to delay a request
to be exercised by the Company not more than once in any one-year period.

     3.   Incidental Registration.

          (a)  Whenever the Company proposes to file a Registration Statement
(other than pursuant to Section 2) at any time and from time to time, it will,
prior to such filing, give written notice to all Stockholders of its intention
to do so and, upon the written request of a Stockholder or Stockholders given
within 20 days after the Company provides such notice (which request shall state
the intended method of disposition of such Registrable Shares), the Company
shall use its best efforts to cause all Registrable Shares which the Company has
been requested by such Stockholder or Stockholders to prepare and file with the
Commission a Registration Statement with respect to such Registrable Shares to
the extent necessary to permit their sale or other disposition in accordance
with the intended methods of distribution specified in the request of such
Stockholder or Stockholders and use its best efforts to cause the Registration
Statement to become effective as soon as reasonably practicable thereafter;
provided that the Company shall have the right to postpone or withdraw any
registration effected pursuant to this Section 3 without obligation to any
Stockholder.

          (b)  In connection with any registration under this Section 3
involving an underwriting, the Company shall not be required to include any
Registrable Shares in such registration unless the holders thereof accept the
terms of the underwriting as agreed upon between the Company and the
underwriters selected by it (provided that such terms must be consistent with
this Agreement). If in the opinion of the managing underwriter it is appropriate
because of marketing factors to limit the number of Registrable Shares to be
included in the offering, then the Company shall be required to include in the
registration only that number of Registrable Shares, if any, which the managing
underwriter believes should be included therein; provided that no persons or
entities other than the Company and the Stockholders shall be permitted to
include securities in the offering. If the number of Registrable Shares to be
included in the offering in accordance with the foregoing is less than the total
number of shares which the holders of Registrable Shares have requested to be
included, then the holders of Registrable Shares who have requested registration
and other holders of securities entitled to include them in such registration
shall participate in the registration pro rata based upon the number of
Registrable Shares which they have requested to be so registered. If any holder
would thus be entitled to include more securities than such holder requested to
be registered, the excess shall be allocated among other requesting holders pro
rata in the manner described in the preceding sentence.

                                      -4-
<PAGE>   5

     4.   Registration Procedures. If and whenever the Company is required by
the provisions of this Agreement to use its best efforts to effect the
registration of any of the Registrable Shares under the Securities Act, the
Company shall:

          (a)  file with the Commission a Registration Statement with respect to
such Registrable Shares and use its best efforts to cause that Registration
Statement to become and remain effective;

          (b)  as expeditiously as possible prepare and file with the Commission
any amendments and supplements to the Registration Statement and the prospectus
included in the Registration Statement as may be necessary to keep the
Registration Statement effective, in the case of a firm commitment underwritten
public offering, until each underwriter has completed the distribution of all
securities purchased by it and, in the case of any other offering, until the
earlier of the sale of all Registrable Shares covered thereby or 120 days after
the effective date thereof in the case of a registration statement on Form S-1
and two (2) years in the case of a registration statement on Form S-2 or S-3;

          (c)  as expeditiously as possible furnish to each selling Stockholder
such reasonable numbers of copies of the prospectus, including a preliminary
prospectus, in conformity with the requirements of the Securities Act, and such
other documents as the selling Stockholder may reasonably request in order to
facilitate the public sale or other disposition of the Registrable Shares owned
by the selling Stockholder; and

          (d)  as expeditiously as possible use its best efforts to register or
qualify the Registrable Shares covered by the Registration Statement under the
securities or Blue Sky laws of such states as the selling Stockholders shall
reasonably request, and do any and all other acts and things that may be
necessary or desirable to enable the selling Stockholders to consummate the
public sale or other disposition in such states of the Registrable Shares owned
by the selling Stockholder; provided, however, that the Company shall not be
required in connection with this paragraph (d) to qualify as a foreign
corporation or execute a general consent to service of process in any
jurisdiction.

If the Company has delivered preliminary or final prospectuses to the selling
Stockholders and after having done so the prospectus is amended to comply with
the requirements of the Securities Act, the Company shall promptly notify the
selling Stockholders and, if requested, the selling Stockholders shall
immediately cease making offers of Registrable Shares and return all
prospectuses to the Company. The Company shall promptly provide the selling
Stockholders with revised prospectuses and, following receipt of the revised
prospectuses, the selling Stockholders shall be free to resume making offers of
the Registrable Shares.

     5.   Allocation of Expenses. The Company will pay all Registration Expenses
of all registrations under this Agreement; provided, however, that if a
registration under Section 2 is withdrawn at the request of the Stockholders
requesting such registration (other than as a result of information concerning
the business or financial condition of the Company which is made known to the
Stockholders after the date on which such registration was requested) and if the
requesting Stockholders elect not to have such registration counted as a
registration requested under Section 2, the requesting Stockholders shall pay
the Registration Expenses of such

                                      -5-
<PAGE>   6

registration pro rata in accordance with the number of their Registrable Shares
included in such registration. For purposes of this Section 5, the term
"Registration Expenses" shall mean all expenses incurred by the Company in
complying with this Agreement, including, without limitation, all registration
and filing fees, exchange listing fees, printing expenses, fees and expenses of
counsel for the Company and up to $20,000 of the fees and expenses of one
counsel selected by the selling Stockholders to represent the selling
Stockholders, state Blue Sky fees and expenses, and the expense of any special
audits incident to or required by any such registration, but excluding
underwriting discounts, selling commissions and the fees and expenses of selling
Stockholders' own counsel (other than the counsel selected to represent all
selling Stockholders).

     6.   Indemnification and Contribution.

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

          (b)  In the event of any registration of any of the Registrable Shares
under the Securities Act pursuant to this Agreement, each seller of Registrable
Shares, severally and not jointly, will indemnify and hold harmless the Company,
each of its directors and officers and each underwriter (if any) and each
person, if any, who controls the Company or any such underwriter within the
meaning of the Securities Act or the Exchange Act, against any losses, claims,
damages or liabilities, joint or several, to which the Company, such directors
and officers, underwriter or controlling person may become subject under the
Securities Act, Exchange Act, state securities or Blue Sky laws or otherwise,
insofar as such losses, claims, damages or liabilities (or actions in respect
thereof) arise out of or are based upon any untrue statement or alleged untrue
statement of a material fact contained in any Registration Statement under which
such Registrable Shares were registered under the Securities Act, any
preliminary prospectus or final prospectus contained in the Registration
Statement, or any amendment or

                                      -6-
<PAGE>   7

supplement to the Registration Statement, or arise out of or are based upon any
omission or alleged omission to state a material fact required to be stated
therein or necessary to make the statements therein not misleading, if the
statement or omission was made in reliance upon and in conformity with
information relating to such seller furnished in writing to the Company by or on
behalf of such seller specifically for use in connection with the preparation of
such Registration Statement, prospectus, amendment or supplement; provided,
however, that the obligations of such Stockholders hereunder shall be limited to
an amount equal to the proceeds to each Stockholder of Registrable Shares sold
in connection with such registration.

          (c)  Each party entitled to indemnification under this Section 6 (the
"Indemnified Party") shall give notice to the party required to provide
indemnification (the "Indemnifying Party") promptly after such Indemnified Party
has actual knowledge of any claim as to which indemnity may be sought, and shall
permit the Indemnifying Party to assume the defense of any such claim or any
litigation resulting therefrom; provided, that counsel for the Indemnifying
Party, who shall conduct the defense of such claim or litigation, shall be
approved by the Indemnified Party (whose approval shall not be unreasonably
withheld); and, provided, further, that the failure of any Indemnified Party to
give notice as provided herein shall not relieve the Indemnifying Party of its
obligations under this Section 6. The Indemnified Party may participate in such
defense at such party's expense; provided, however, that the Indemnifying Party
shall pay such expense if representation of such Indemnified Party by the
counsel retained by the Indemnifying Party would be inappropriate due to actual
or potential differing interests between the Indemnified Party and any other
party represented by such counsel in such proceeding. No Indemnifying Party, in
the defense of any such claim or litigation shall, except with the consent of
each Indemnified Party, consent to entry of any judgment or enter into any
settlement which does not include as an unconditional term thereof the giving by
the claimant or plaintiff to such Indemnified Party of a release from all
liability in respect of such claim or litigation, and no Indemnified Party shall
consent to entry of any judgment or settle such claim or litigation without the
prior written consent of the Indemnifying Party.

          (d)  In order to provide for just and equitable contribution to joint
liability under the Securities Act in any case in which either (i) any holder of
Registrable Shares exercising rights under this Agreement, or any controlling
person of any such holder, makes a claim for indemnification pursuant to this
Section 6 but it is judicially determined (by the entry of a final judgment or
decree by a court of competent jurisdiction and the expiration of time to appeal
or the denial of the last right of appeal) that such indemnification may not be
enforced in such case notwithstanding the fact that this Section 6 provides for
indemnification in such case, or (ii) contribution under the Securities Act may
be required on the part of any such selling Stockholder or any such controlling
person in circumstances for which indemnification is provided under this Section
6; then, in each such case, the Company and such Stockholder will contribute to
the aggregate losses, claims, damages or liabilities to which they may be
subject (after contribution from others) in such proportions so that such holder
is responsible for the portion represented by the percentage that the public
offering price of its Registrable Shares offered by the Registration Statement
bears to the public offering price of all securities offered by such
Registration Statement, and the Company is responsible for the remaining
portion; provided, however, that, in any such case, (A) no such holder will be
required to contribute any amount in excess of the proceeds to it of all
Registrable Shares sold by it pursuant to such

                                      -7-
<PAGE>   8

Registration Statement, and (B) no person or entity guilty of fraudulent
misrepresentation, within the meaning of Section 11(f) of the Securities Act,
shall be entitled to contribution from any person or entity who is not guilty of
such fraudulent misrepresentation.

     7.   Indemnification with Respect to Underwritten Offering. In the event
that Registrable Shares are sold pursuant to a Registration Statement in an
underwritten offering pursuant to Section 2, the Company agrees to enter into an
underwriting agreement containing customary representations and warranties with
respect to the business and operations of an issuer of the securities being
registered and customary covenants and agreements to be performed by such
issuer, including without limitation customary provisions with respect to
indemnification and contribution by the Company of the underwriters of such
offering.

     8.   Information by Holder. Each Stockholder including Registrable Shares
in any registration shall furnish to the Company such information regarding such
Stockholder and the distribution proposed by such Stockholder as the Company may
reasonably request in writing and as shall be required in connection with any
registration, qualification or compliance referred to in this Agreement.

     9.   "Stand-Off" Agreement. Each Stockholder, if requested by the Company
and the managing underwriter of an offering by the Company of Common Stock or
other securities of the Company pursuant to a Registration Statement, shall
agree not to sell publicly or otherwise transfer or dispose of any Registrable
Shares or other securities of the Company held by such Stockholder for a
specified period of time (not to exceed 180 days for an initial public offering
and 90 days for any other offering) following the effective date of such
Registration Statement; provided, that all officers and directors of the Company
enter into similar agreements.

     10.  Rule 144 Requirements. After the earliest of (i) the closing of the
sale of securities of the Company pursuant to a Registration Statement, (ii) the
registration by the Company of a class of securities under Section 12 of the
Exchange Act, or (iii) the issuance by the Company of an offering circular
pursuant to Regulation A under the Securities Act, the Company agrees to:

          (a)  comply with the requirements of Rule 144(c) under the Securities
Act with respect to current public information about the Company;

          (b)  use its best efforts to file with the Commission in a timely
manner all reports and other documents required of the Company under the
Securities Act and the Exchange Act (at any time after it has become subject to
such reporting requirements); and

          (c)  furnish to any holder of Registrable Shares upon request (i) a
written statement by the Company as to its compliance with the requirements of
said Rule 144(c), and the reporting requirements of the Securities Act and the
Exchange Act (at any time after it has become subject to such reporting
requirements), (ii) a copy of the most recent annual or quarterly report of the
Company, and (iii) such other reports and documents of the Company as such
holder may reasonably request to avail itself of any similar rule or regulation
of the Commission allowing it to sell any such securities without registration.

                                      -8-
<PAGE>   9

     11.  Mergers, Etc. The Company shall not, directly or indirectly, enter
into any merger, consolidation or reorganization in which the Company shall not
be the surviving corporation unless the proposed surviving corporation shall,
prior to such merger, consolidation or reorganization, agree in writing to
assume the obligations of the Company under this Agreement, and for that purpose
references hereunder to "Registrable Shares" shall be deemed to be references to
the securities which the Stockholders would be entitled to receive in exchange
for Registrable Shares under any such merger, consolidation or reorganization;
provided, however, that the provisions of this Section 11 shall not apply in the
event of any merger, consolidation or reorganization in which the Company is not
the surviving corporation if all Stockholders are entitled to receive in
exchange for their Registrable Shares consideration consisting solely of (i)
cash, (ii) securities of the acquiring corporation which may be immediately sold
to the public without registration under the Securities Act, or (iii) securities
of the acquiring corporation which the acquiring corporation has agreed to
register within 90 days of completion of the transaction for resale to the
public pursuant to the Securities Act.

     12.  Termination. All of the Company's obligations to register Registrable
Shares under this Agreement shall terminate on the tenth anniversary of this
Agreement.

     13.  Transferability of Rights. This Agreement, and the rights and
obligations of each Stockholder hereunder, may be assigned by such Stockholder
only after the closing of an initial public offering of the Company's Common
Stock.

     14.  General.

          (a)  Notices. All notices, requests, consents, and other
communications under this Agreement shall be in writing and shall be delivered
by hand or mailed by first class certified or registered mail, return receipt
requested, postage prepaid or transmitted by telecopy:

If to the Company, at One Democracy Plaza, 6701 Democracy Boulevard, Suite 805,
Bethesda, Maryland 20817, Attention: President, telecopy: 301-897-4974 or at
such other address or addresses as may have been furnished in writing by the
Company to the Purchasers, with a copy to David Sylvester, Esq., Hale and Dorr
LLP, The Willard Office Building, Suite 1000, 1455 Pennsylvania Avenue, N.W.,
Washington, D.C. 20004, telecopy: 202-942-8484; or

If to a Stockholder, at his or its address set forth on Exhibit A, or at such
other address or addresses as may have been furnished to the Company in writing
by such Purchaser.

Notices provided in accordance with this Section 14(a) shall be deemed delivered
upon personal delivery or two business days after deposit in the mail or, with
respect to a telecopy, at such time as it is delivered to the addressee, with
the answer back being deemed conclusive, but not exclusive, evidence of such
delivery.

          (b)  Entire Agreement. This Agreement embodies the entire agreement
and understanding between the parties hereto with respect to the subject matter
hereof and supersedes all prior agreements and understandings relating to such
subject matter.

          (c)  Amendments and Waivers. Any term of this Agreement may be amended
and the observance of any term of this Agreement may be waived (either generally
or in a

                                      -9-
<PAGE>   10

particular instance and either retroactively or prospectively), with the written
consent of the Company, Kay and the holders of at least 51% of the Registrable
Shares held by holders other than Kay; provided, that this Agreement may be
amended with the consent of the holders of less than all Registrable Shares only
in a manner which affects all Registrable Shares in the same fashion. No waivers
of or exceptions to any term, condition or provision of this Agreement, in any
one or more instances, shall be deemed to be, or construed as, a further or
continuing waiver of any such term, condition or provision.

          (d)  Counterparts. This Agreement may be executed in one or more
counterparts, each of which shall be deemed to be an original, but all of which
shall be one and the same document.

          (e)  Severability. The invalidity or unenforceability of any provision
of this Agreement shall not affect the validity or enforceability of any other
provision of this Agreement.

          (f)  Governing Law. This Agreement shall be governed by and construed
in accordance with the laws of the State of Delaware.

                                      -10-
<PAGE>   11

            Executed as of the date first written above.

                                             THE COMPANY:
                                             OPTICAL TECHNOLOGY GROUP, INC.

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

                                             KAY:

                                                 -------------------------------
                                                      Richard A. Kay

                                             CAPLE:

                                                   -----------------------------
                                                      F. William Caple

                                             A. KAY:

                                                    ----------------------------
                                                    Richard Kay, in his capacity
                                                    as custodian for Alexandra
                                                    Kay with respect to the
                                                    shares of Optical Technology
                                                    Group, Inc.

                                             PURCHASERS:
                                             ABS CAPITAL PARTNERS II, L.P.
                                             By: ABS Partners II, L.L.C.
                                                  Its General Partner

                                             By:
                                                --------------------------------
                                                Donald B. Hebb, Jr.
                                                Managing Member

                                                --------------------------------
                                                Michael P. Murray

                                      -11-
<PAGE>   12

                                       GREYLOCK IX LIMITED PARTNERSHIP
                                       By:  Greylock IX GP Limited Partnership
                                               Its General Partner

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

EXHIBIT A

ABS Capital Partners II, L.P.
One South Street
Baltimore, MD 21202
Attn: Donald B. Hebb, Jr.
Telecopy: 410-895-4380

Michael P. Murray
BT Alex Brown Incorporated
101 Federal Street
15th Floor
Boston, MA 02110
Telecopy:  617-261-3706

Greylock IX Limited Partnership
One Federal Street
Boston, MA 02110-2065
Attn:  Howard Cox
Telecopy: 617-482-0059

                                      -12-

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