Document:

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                                                                   Exhibit 10.15
                                    FORM OF
                              EMPLOYMENT AGREEMENT

     This Employment Agreement (this "Agreement"), dated as of March 10, 2000 is
between Luminex Corporation, a Delaware corporation, and [Exhibit A]
("Executive").

                                R E C I T A L S

     A.  Executive has been employed by Employer, and Employer and Executive
desire to enter into a written agreement to specify the terms and conditions of
Executive's continued employment with Employer.

     B.  Employer considers the maintenance of a sound management team,
including Executive, essential to protecting and enhancing its best interests
and those of its stockholders.

     C.  Employer recognizes that the possibility of a change in control of
Employer may result in the departure or distraction of management to the
detriment of Employer and its stockholders.

     D.  Executive is an executive officer of Employer and an integral member of
its management team.

     E.  Employer has determined that appropriate steps should be taken to
reinforce and encourage the continued attention and dedication of selected
members of Employer's management team to their assigned duties without the
distraction arising from the possibility of a change in control of Employer.

     In consideration of Executive's past and future employment with Employer
and other good and valuable consideration the parties agree as follows:

     SECTION 1.  Employment.  Employer hereby employs Executive, and Executive
hereby accepts employment, upon the terms and subject to the conditions
hereinafter set forth.

     SECTION 2.  Duties.  Executive shall be employed as [Exhibit A] of the
Company, or such other position of comparable or greater responsibilities and
that are within Executive's area of expertise to which he may be appointed by
the Board of Directors.  Executive agrees to devote his full time and best
efforts to the performance of the duties attendant to his executive position
with Employer.

     SECTION 3.  Term.  The term of employment of Executive hereunder shall
commence on the date of [Exhibit A] (the "Commencement Date") and continue until
March 9, 2003 unless earlier terminated pursuant to Section 6 or Section 10;
provided, however, that commencing on March 9, 2002 the term shall automatically
be extended on each day from that date for an additional year.

     SECTION 4.  Compensation and Benefits.  In consideration for the services
of Executive hereunder, Employer shall compensate Executive as follows:

     (a) Base Salary.  Until the termination of Executive's employment
hereunder, Employer shall pay Executive a base salary at an annual rate of not
less than $[Exhibit A] (as may be increased from time to time, the "Base
Salary") payable in accordance with the then current payroll policies of
Employer. Any increase in the Base Salary shall be in the sole discretion of the
Board of Directors of the Company or the appropriate committee thereof.
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     (b) Management Incentive Bonus.  Executive shall be eligible to receive
from Employer such annual management incentive bonuses as may be provided in
management incentive bonus plans adopted from time to time by Employer.

     (c) Vacation. Executive shall be entitled to three weeks of paid vacation
per year at the reasonable and mutual convenience of Employer and Executive.
Unless otherwise approved by the Board of Directors of the Company or the
appropriate committee thereof, accrued vacation not taken in any applicable
period shall not be carried forward or used in any subsequent period.

     (d)  Group Benefits.  Executive shall be entitled to participate in all
group benefit plans of Employer in accordance with Employer's regular practices
for its employees. Employer shall provide accident, health, dental, disability
and life insurance for Executive under the group accident, health, dental,
disability and life insurance plans maintained by Employer for its full-time,
salaried employees.

     SECTION 5.  Expenses.  Executive shall be entitled to reimbursement from
Employer for reasonable out-of-pocket expenditures incurred by Executive in the
course of performing Executive's duties hereunder.

     SECTION 6.  Termination.

     (a) General.  Executive's employment hereunder shall commence on the
Commencement Date and continue until the end of the term specified in Section 3,
except that the employment of Executive hereunder shall terminate prior to such
time in accordance with the following:

          (i) Death or Disability.  Upon the death of Executive during the term
     of his employment hereunder or, at the option of Employer, in the event of
     Executive's Disability, upon 30 days' notice to Executive.

          (ii) For Cause.  For "Cause" immediately upon written notice by
     Employer to Executive.  A termination shall be for Cause if:

               (1) Executive commits a criminal act involving moral turpitude;
          or

               (2) Executive commits a material breach of any of the covenants,
          terms and provisions hereof or fails to obey lawful and proper written
          directions delivered to Executive by Employer's Chairman of the Board,
          President, Chief Executive Officer or its Board of Directors.

          (iii)  Without Cause.  Without Cause upon notice by Employer to
     Executive.  Without limiting the foregoing, the termination of Executive's
     employment hereunder upon the expiration of the term of his employment
     specified in Section 3 shall be treated as a termination by Employer
     without Cause pursuant to this Section 6(a)(iii).

(b)  Severance Pay and Bonuses.

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          (i) Termination Upon Death or Disability.  Executive shall not be
     entitled to any Separation Payments or any other severance pay or other
     compensation upon termination of his employment hereunder pursuant to
     Section 6(a)(i) except for the following (which shall be paid promptly
     after termination, except as specified in subsection (4) below):

               (1) his Base Salary accrued but unpaid as of the date of
          termination;

               (2) unpaid expense reimbursements under Section 5 for expenses
          incurred in accordance with the terms hereof prior to termination;

               (3) compensation for accrued, unused vacation as of the date of
          termination, determined in accordance with Employer's policies and
          procedures then in effect; and

               (4) any bonus to which Executive would have been entitled for the
          Bonus Period if he were still employed hereunder on the last day of
          the Bonus Period.  Any such bonus shall be paid to Executive at the
          same time bonuses are paid in respect of the Bonus Period to other
          employees of Employer entitled to receive bonuses for the Bonus
          Period.  In the event the determination of Executive's bonus in
          respect of the Bonus Period involves any subjective assessment, such
          assessment shall be made in a manner most favorable to Executive.  For
          purposes of this Agreement, the term "Bonus Period" means the full
          fiscal year or other applicable bonus period during which Executive's
          employment hereunder was terminated (or during which Executive became
          Disabled, in the event of a termination for Disability).

          (ii) Termination Without Cause.  In the event Executive's employment
     hereunder is terminated pursuant to Section 6(a)(iii), Employer shall
     promptly pay Executive an amount equal to one year's Base Salary at the
     then current rate plus the amount of the most recent annual cash bonus
     amount in a single lump sum payment as Executive's sole remedy in
     connection with such termination. Employer shall also promptly pay
     Executive the following:

               (1) his Base Salary accrued but unpaid as of the date of
          termination;

               (2) unpaid expense reimbursements under Section 5 for expenses
          incurred in accordance with the terms hereof prior to termination; and

               (3) compensation for accrued, unused vacation as of the date of
          termination, determined in accordance with Employer's policies and
          procedures then in effect.

     The payments described in this Section 3(b)(ii) are referred to herein
     collectively as the "Separation Payments."  This Section 6(b)(ii) is
     subject to the provisions of Section 10(j) dealing with the coordination of
     payments in the event of a Change in Control.

          (iii)  Termination For Cause; Voluntary Termination.  Executive shall
     not be entitled to any Separation Payments or any other severance pay or
     other compensation upon termination of his employment hereunder pursuant to
     Section 6(a)(ii), or upon Executive's voluntary termination of his
     employment hereunder, except for the following (which shall be paid
     promptly after termination):

               (1) his Base Salary accrued but unpaid as of the date of
          termination;

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               (2) unpaid expense reimbursements under Section 5 for expenses
          incurred in accordance with the terms hereof prior to termination; and

               (3) compensation for accrued, unused vacation as of the date of
          termination, determined in accordance with Employer's policies and
          procedures then in effect.

     (c) Transfers of Employment.  Executive's employment hereunder shall
continue until the earlier of the following:

          (i) Executive's employment with all Employers terminates; or

          (ii) the last Employer (other than the Company) by which Executive is
     employed under this Agreement ceases to be a subsidiary or affiliate of the
     Company.  For purposes of Section 6(b)(ii), the termination of Executive's
     employment hereunder pursuant to this Section 6(c)(ii) shall be treated as
     a termination by Employer without Cause pursuant to Section 6(a)(iii).

     SECTION 7.  Inventions; Assignment.

     (a)  Inventions Defined.  All rights to discoveries, inventions,
improvements, designs, work product and innovations (including without
limitation all data and records pertaining thereto) that relate to the business
of Employer, whether or not specifically within Executive's duties or
responsibilities and whether or not patentable, copyrightable or reduced to
writing, that Executive may discover, invent, create or originate during the
term of his employment hereunder or otherwise, and for a period of six months
thereafter, either alone or with others and whether or not during working hours
or by the use of the facilities of Employer ("Inventions"), shall be the
exclusive property of Employer. Executive shall promptly disclose all Inventions
to Employer, shall execute at the request of Employer any assignments or other
documents Employer may deem necessary to protect or perfect its rights therein,
and shall assist Employer, at Employer's expense, in obtaining, defending and
enforcing Employer's rights therein. Executive hereby appoints Employer as his
attorney-in-fact to execute on his behalf any assignments or other documents
deemed necessary by Employer to protect or perfect its rights to any Inventions.

     (b) Covenant to Assign and Cooperate.  Without limiting the generality of
the foregoing, Executive shall assign and transfer, and does hereby assign and
transfer, to Employer the world-wide right, title and interest of Executive in
the Inventions.  Executive agrees that Employer may file copyright registrations
and apply for and receive patents (including without limitation Letters Patent
in the United States) for the Inventions in Employer's name in such countries as
may be determined solely by Employer.  Executive shall communicate to Employer
all facts known to Executive relating to the Inventions and shall cooperate with
Employer's reasonable requests in connection with vesting title to the
Inventions and related copyrights and patents exclusively in Employer and in
connection with obtaining, maintaining, protecting and enforcing Employer's
exclusive copyrights and patent rights in the Inventions.

     (c) Successors and Assigns.  Executive's obligations under this Section 7
shall inure to the benefit of Employer and its successors and assigns and shall
survive the expiration of the term of this Agreement for such time as may be
necessary to protect the proprietary rights of Employer in the Inventions.

     (d)  Consideration and Expenses   .  Executive shall perform his
obligations under this Section 7 at Employer's expense, but without any
additional or special compensation therefor.

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     SECTION 8.  Confidential Information.

     (a) Acknowledgment of Proprietary Interest.  Executive acknowledges that
all Confidential Information is a valuable, special and unique asset of
Employer's business, access to and knowledge of which are essential to the
performance of Executive's duties hereunder. Executive acknowledges the
proprietary interest of Employer in all Confidential Information.  Executive
agrees that all Confidential Information learned by Executive during his
employment with Employer or otherwise, whether developed by Executive alone or
in conjunction with others or otherwise, is and shall remain the exclusive
property of Employer.  Executive further acknowledges and agrees that his
disclosure of any Confidential Information will result in irreparable injury and
damage to Employer.

     (b)  Confidential Information Defined.  "Confidential Information" means
all confidential and proprietary information of Employer, written, oral or
computerized, as it may exist from time to time, including without limitation
(i) information derived from reports, investigations, experiments, research and
work in progress, (ii) methods of operation, (iii) market data, (iv) proprietary
computer programs and codes, (v) drawings, designs, plans and proposals, (vi)
marketing and sales programs, (vii) client and supplier lists and any other
information about Employer's relationships with others, (viii) historical
financial information and financial projections, (ix) network and system
architecture, (x) all other concepts, ideas, materials and information prepared
or performed for or by Employer and (xi) all information related to the business
plan, business, products, purchases or sales of Employer or any of its suppliers
and customers, other than information that is publicly available.

     (c)  Covenant Not To Divulge Confidential Information.  Employer is
entitled to prevent the disclosure of Confidential Information. As a portion of
the consideration for the employment of Executive and for the compensation being
paid to Executive by Employer, Executive agrees at all times during the term of
his employment hereunder and thereafter to hold in strict confidence and not to
disclose or allow to be disclosed to any person, firm or corporation, other than
to persons engaged by Employer to further the business of Employer, and not to
use except in the pursuit of the business of Employer, the Confidential
Information, without the prior written consent of Employer. This Section 8 shall
survive and continue in full force and effect in accordance with its terms
after, and will not be deemed to be terminated by, any termination of this
Agreement or of Executive's employment with Employer for any reason.

     (d)  Return of Materials at Termination.  In the event of any termination
or cessation of his employment with Employer for any reason, Executive shall
promptly deliver to Employer all property of Employer, including without
limitation all documents, data and other information containing, derived from or
otherwise pertaining to Confidential Information. Executive shall not take or
retain any property of Employer, including without limitation any documents,
data or other information, or any reproduction or excerpt thereof, containing,
derived from or pertaining to any Confidential Information. The obligation of
confidentiality set forth in this Section 8 shall continue notwithstanding
Executive's delivery of such documents, data and information to Employer.

SECTION 9.  Noncompetition.

     (a) Covenant Not to Compete.  Executive acknowledges that during the term
of his employment Employer has agreed to provide to him, and he shall receive
from Employer, special training and knowledge, including without limitation the
Confidential Information.  Executive acknowledges that the Confidential
Information is valuable to Employer and, therefore, its protection and
maintenance constitutes a legitimate

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interest to be protected by Employer by the enforcement of the covenant not to
compete contained in this Section 9. Executive also acknowledges that such
covenant not to compete is ancillary to other enforceable agreements of the
parties, including without limitation the agreements regarding Confidential
Information in Section 8 and the agreements regarding the payment of the
Separation Payments and other severance pay and of the Termination Payment in
Section 6 and Section 10, respectively. Therefore, following the termination of
Employee's employment hereunder, Executive shall not directly or indirectly:

          (i) for a period of one year following the date of the termination
     (unless extended pursuant to the terms of this Section 9) engage, alone or
     as a shareholder, partner, member, manager, director, officer, employee of
     or consultant to, any entity other than Employer that is in existence on
     the date of the termination and is at that time engaged directly, or
     indirectly through any subsidiary, division or other business unit
     (individually, an "Entity") that engages, anywhere in North America or in
     any other geographic area in or with respect to which Executive has any
     duties or responsibilities during the term of his employment with Employer,
     in any business activities that were conducted by Employer prior to the
     date of such termination (the "Designated Industry"); or

          (ii) for a period of one year following the date of the termination
     (unless extended pursuant to the terms of this Section 9) solicit or
     encourage any director, officer, employee of or consultant to Employer to
     end his relationship with Employer and commence any such relationship with
     any competitor of Employer in the Designated Industry.

     (b) Exclusion. Notwithstanding the provisions of this Section 9, Employee's
noncompetition obligations hereunder shall not preclude Employee from owning
less than one percent of the voting power or economic interest in any publicly
traded corporation conducting business activities in the Designated Industry.

     (c) No Offset. The representations and covenants contained in this Section
9 on the part of Executive shall be construed as ancillary to and independent of
any other provision of this Agreement, and the existence of any claim (monetary
or otherwise) or cause of action of Executive against Employer or any officer,
director or shareholder of Employer, whether predicated on this Agreement or
otherwise, shall not constitute a defense to the enforcement by Employer of the
covenants of Executive contained in this Section 9.

     (d) Extension and Survival.  If Executive violates any covenant contained
in this Section 9, Employer shall not, as a result of such violation or the time
involved in obtaining legal or equitable relief

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therefor, be deprived of the benefit of the full period of any such covenant.
Accordingly, the covenants of Executive contained in this Section 9 shall be
deemed to have durations as specified in Section 9(a), which periods shall be
extended by a number of days equal to the sum of (i) the total number of days
Executive is in violation of any of the covenants contained in this Section 9
prior to the commencement of any litigation relating thereto and (ii) the total
number of days the parties are involved in such litigation, through the date of
entry by a court of competent jurisdiction of a final judgment enforcing the
covenants of Executive in this Section 9. This Section 9 shall survive and
continue in full force and effect in accordance with its terms after, and will
not be deemed to be terminated by, any termination of this Agreement.

     (e) Severability.  If at any time the provisions of this Section 9 are
determined to be invalid or unenforceable by reason of being vague or
unreasonable as to area, duration or scope of activity, this Section 9 shall be
considered divisible and shall be immediately amended to only such area,
duration or scope of activity as shall be determined to be reasonable and
enforceable by the court or other body having jurisdiction over the matter; and
Executive agrees that this Section 9 as so amended shall be valid and binding as
though any invalid or unenforceable provision had not been included herein.

     SECTION 10.  Termination of Employment in Connection With a Change In
Control.

     (a) Applicability.  The provisions of this Section 10 shall apply in lieu
of all conflicting provisions in this Agreement in the event Executive's
employment with Employer is terminated in a Triggering Termination.  Each of the
following events constitutes a "Triggering Termination" when Executive's
employment with Employer is:

          (i)   actually terminated by Employer during an Applicable Period for
     any reason other than for Good Reason;

          (ii)   Constructively Terminated by Employer during an Applicable
     Period;

          (iii)  terminated by Executive for any reason other than death, or for
     no reason, within the 180 day period commencing on the date of the Change
     in Control; or

          (iv)   terminated pursuant to Section 6(c)(ii) during an Applicable
     Period.

     (b) Termination Payment.  Upon the occurrence of a Triggering Termination,
Employer shall pay Executive a lump sum payment in cash (the "Termination
Payment") equal to 2.99 times Executive's average annual base salary plus cash
bonus amount for the most recent five calendar years ending prior to the
occurrence of the Triggering Event.  Employer shall pay the Termination Payment
to Executive concurrently with the Triggering Termination or, if the Triggering
Termination occurs before the Change in Control, concurrently with the Change in
Control.

     (c) Change in Control.  A Change in Control means the occurrence during the
term of this Agreement of any of the following events:

          (i) Employer is merged, consolidated or reorganized into or with
     another corporation or other legal person, and as a result of such merger,
     consolidation or reorganization less than 50% of the combined voting
     power of the then-outstanding securities entitled to vote generally in the
     election of directors ("Voting Stock") of such corporation or person
     immediately after such transaction are held in the aggregate by the holders
     of Voting Stock of Employer immediately prior to

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     such transaction;

          (ii) Employer sells or otherwise transfers all or substantially all of
     its assets to another corporation or other legal person, and less than 50%
     of the combined voting power of the then-outstanding Voting Stock of such
     corporation or person is held in the aggregate by the holders of Voting
     Stock of Employer immediately prior to such sale or transfer;

          (iii)  There is a report filed on Schedule 13D or Schedule 14D-1 (or
     any successor schedule, form or report), each as promulgated pursuant to
     the Securities Exchange Act of 1934, as amended (the "Exchange Act"),
     disclosing that any person (as the term "person" is used in Section
     13(d)(3) or Section 14(d)(2) of the Exchange Act), other than a Director of
     Employer on the date hereof (or any group of such Directors), has become
     the beneficial owner (as the term "beneficial owner" is defined under Rule
     13d-3 or any successor rule or regulation promulgated under the Exchange
     Act) of securities representing 50% or more of the combined voting power of
     the then-outstanding Voting Stock of Employer;

          (iv) Employer files a report or proxy statement with the Securities
     and Exchange Commission pursuant to the Exchange Act disclosing in response
     to Form 8-K or Schedule 14A (or any successor schedule, form or report or
     item therein) that a change in control of Employer has occurred or will
     occur in the future pursuant to any then-existing contract or transaction;
     or

          (v) If, in connection with a proxy solicitation initiated by a person
     or group other than the Board of Directors of Employer, individuals who at
     the beginning of such proxy solicitation constitute the Directors of
     Employer cease for any reason to constitute at least a majority thereof
     within the one year period following the initiation of such proxy
     solicitation.

     Notwithstanding the foregoing provisions of Sections 10(c)(iii) or
10(c)(iv), unless otherwise determined in a specific case by majority vote of
the Board, a "Change in Control" shall not be deemed to have occurred for
purposes of Section 10(c)(iii) or 10(c)(iv) solely because (A) Employer, (B) an
entity in which Employer directly or indirectly beneficially owns 50% or more of
the outstanding Voting Stock (a "Subsidiary"), or (C) any Employer-sponsored
employee stock ownership plan or any other employee benefit plan of Employer
either files or becomes obligated to file a report or a proxy statement under or
in response to Schedule 13D, Schedule 14D-1, Form 8-K or Schedule 14A (or any
successor schedule, form or report or item therein) under the Exchange Act
disclosing beneficial ownership by it of shares of Voting Stock of Employer,
whether in excess of 50% or otherwise, or because Employer reports that a change
in control of Employer has occurred or will occur in the future by reason of
such beneficial ownership or any increase or decrease thereof.

     (d)  Gross Up Payment.

          (i) Anything in this Agreement to the contrary notwithstanding, in the
     event that it shall be determined (as hereafter provided) that all or any
     portion of any payment or distribution by Employer or any of its affiliates
     to or for the benefit of Executive pursuant to the terms of this Section 10
     or otherwise, including under any stock option or other agreement, plan,
     policy, program or arrangement (a "Payment"), would be subject to the
     excise tax imposed by Section 4999 of the

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     Code (or any successor provision thereto), by reason of being considered
     "contingent on a change in ownership or control" of Employer, within the
     meaning of Section 280G of the Code (or any successor provision thereto),
     or to any similar tax imposed by state or local law, or any interest or
     penalties with respect to such tax (such tax or taxes, together with any
     such interest and penalties, being hereafter collectively referred to as
     the "Excise Tax"), then Executive shall be entitled to receive an
     additional payment or payments (collectively, a "Gross-Up Payment");
     provided, however, that no Gross-Up Payment shall be made with respect to
     the Excise Tax, if any, attributable to (i) any incentive stock option, as
     defined by Section 422 of the Code ("ISO") granted prior to the execution
     of this Agreement, or (ii) any stock appreciation or similar right, whether
     or not limited, granted in tandem with an ISO described in clause (i). The
     Gross-Up Payment shall be in an amount such that, after payment by
     Executive of all taxes (including any interest or penalties imposed with
     respect to such taxes), including any Excise Tax imposed upon the Gross-Up
     Payment, the Executive retains an amount of the Gross-Up Payment equal to
     the Excise Tax imposed upon the Payment.

          (ii) Subject to the provisions of Section 10(d)(vi), all
     determinations required to be made under this Section 10(d), including
     whether an Excise Tax is payable by Executive and the amount of such Excise
     Tax and whether a Gross-Up Payment is required to be paid by Employer to
     Executive and the amount of such Gross-Up Payment, if any, shall be made by
     a nationally recognized accounting firm (the "Accounting Firm") selected by
     Executive in his sole discretion.  Executive shall direct the Accounting
     Firm to submit its determination and detailed supporting calculations to
     both Employer and Executive within 30 calendar days after the Termination
     Date, if applicable, and any such other time or times as may be requested
     by Employer or Executive.  If the Accounting Firm determines that any
     Excise Tax is payable by Executive, Employer shall pay the required Gross-
     Up Payment to Executive within five business days after receipt of such
     determination and calculations with respect to any Gross-Up Payment to
     Executive.  If the Accounting Firm determines that no Excise Tax is payable
     by Executive, it shall, at the same time as it makes such determination,
     furnish Employer and Executive a written opinion to the effect that
     Executive has substantial authority not to report any Excise Tax on his
     federal, state or local income or other tax return.  As a result of the
     uncertainty in the application of Section 4999 of the Code (or any
     successor provision thereto) and the possibility of similar uncertainty
     regarding applicable state or local tax law at the time of any
     determination by the Accounting Firm hereunder, it is possible that Gross-
     Up Payments which will not have been made by Employer should have been made
     (an "Underpayment"), consistent with the calculations required to be made
     hereunder.  In the event that the Company exhausts or fails to pursue its
     remedies pursuant to Section 10(d)(vi) and Executive thereafter is required
     to make a payment of any Excise Tax, Executive shall direct  the Accounting
     Firm to determine the amount of the Underpayment that has occurred and to
     submit its determination and detailed supporting calculations to both
     Employer and Executive as promptly as possible.  Any such Underpayment
     shall be promptly paid by Employer to, or for the benefit of,  Executive
     within five business days after receipt of such determination and
     calculations.

          (iii)  Employer and Executive shall each provide the Accounting Firm
     access to and copies of any books, records and documents in the possession
     of Employer or Executive, as the case may be, reasonably requested by the
     Accounting Firm, and otherwise cooperate with the Accounting Firm in
     connection with the preparation and issuance of the determinations and
     calculations contemplated by this Section 10(d).  Any determination by the
     Accounting Firm as to the amount of any Gross-Up Payment or Underpayment
     shall be binding upon Employer and Executive.

          (iv) The federal, state and local income or other tax returns filed by
     Executive shall be

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     prepared and filed on a consistent basis with the determination of the
     Accounting Firm with respect to the Excise Tax payable by Executive.
     Executive shall make proper payment of the amount of any Excise Tax, and at
     the request of Employer, provide to Employer true and correct copies (with
     any amendments) of his federal income tax return as filed with the Internal
     Revenue Service and corresponding state and local tax returns, if relevant,
     as filed with the applicable taxing authority, and such other documents
     reasonably requested by Employer, evidencing such payment. If prior to the
     filing of Executive's federal income tax return, or corresponding state or
     local tax return, if relevant, the Accounting Firm determines that the
     amount of the Gross-Up Payment should be reduced, Executive shall within
     five business days pay to Employer the amount of such reduction.

          (v) The fees and expenses of the Accounting Firm for its services in
     connection with the determinations and calculations contemplated by this
     Section 10(d) shall be borne by Employer.  If such fees and expenses are
     initially paid by Executive, Employer shall reimburse Executive the full
     amount of such fees and expenses within five business days after receipt
     from Executive of a statement therefor and reasonable evidence of his
     payment thereof.

          (vi) Executive shall notify Employer in writing of any claim by the
     Internal Revenue Service or any other taxing authority that, if successful,
     would require the payment by Employer of a Gross-Up Payment.  Such
     notification shall be given as promptly as practicable but no later than 10
     business days after Executive actually receives notice of such claim and
     Executive shall further apprize Employer of the nature of such claim and
     the date on which such claim is requested to be paid (in each case, to the
     extent known by Executive).  Executive shall not pay such claim prior to
     the earlier of (A) the expiration of the 30-calendar-day period following
     the date on which he gives such notice to Employer and (B) the date that
     any payment of amount with respect to such claim is due.  If Employer
     notifies Executive in writing prior to the expiration of such period that
     it desires to contest such claim, Executive, subject to the provisions of
     Section 10(d) of this Agreement, shall:

               (1) provide Employer with any written records or documents in his
          possession relating to such claim reasonably requested by Employer;

               (2) take such action in connection with contesting such claim as
          Employer shall reasonably request in writing from time to time,
          including without limitation accepting legal representation with
          respect to such claim by an attorney competent in respect of the
          subject matter and reasonably selected by Employer;

               (3) cooperate with Employer in good faith in order effectively to
          contest such claim; and

               (4) permit Employer to participate in any proceedings relating to
          such claim;

          provided, however, that Employer shall bear and pay directly all costs
          and expenses (including interest and penalties) incurred in connection
          with such contest and shall indemnify and hold harmless Executive, on
          an after-tax basis, for and against any Excise Tax or income tax,
          including interest and penalties with respect thereto, imposed as a
          result of such representation and payment of costs and expenses.
          Without limiting the foregoing provisions of this Section 10(d),
          Employer shall control all proceedings taken in connection with the
          contest of any claim contemplated by this Section 10(d) and, at its
          sole option, may pursue or forego any and all administrative appeals,
          proceedings, hearings and conferences

                                       10
<PAGE>

          with the taxing authority in respect of such claim (provided, however,
          that Executive may participate therein at his own cost and expense)
          and may, at its option, either direct Executive to pay the tax claimed
          and sue for a refund or contest the claim in any permissible manner,
          and Executive agrees to prosecute such contest to a determination
          before any administrative tribunal, in a court of initial jurisdiction
          and in one or more appellate courts, as Employer shall determine;
          provided, however, that if Employer directs Executive to pay the tax
          claimed and sue for a refund, Employer shall advance the amount of
          such payment to Executive on an interest-free basis and shall
          indemnify and hold Executive harmless, on an after-tax basis, from any
          Excise Tax or income or other tax, including interest or penalties
          with respect thereto, imposed with respect to such advance; and
          provided further, however, that any extension of the statute of
          limitations relating to payment of taxes for the taxable year of
          Executive with respect to which the contested amount is claimed to be
          due is limited solely to such contested amount. Furthermore,
          Employer's control of any such contested claim shall be limited to
          issues with respect to which a Gross-Up Payment would be payable
          hereunder and Executive shall be entitled to settle or contest, as the
          case may be, any other issue raised by the Internal Revenue Service or
          any other taxing authority.

          (vii)  If, after the receipt by Executive of an amount advanced by
     Employer pursuant to Section 10(d), Executive receives any refund with
     respect to such claim, Executive shall (subject to Employer's complying
     with the requirements of Section 10(d)) promptly pay to Employer the amount
     of such refund (together with any interest paid or credited thereon after
     any taxes applicable thereto).  If, after the receipt by Executive of an
     amount advanced by Employer pursuant to Section 10(d)(vi), a determination
     is made that Executive shall not be entitled to any refund with respect to
     such claim and Employer does not notify Executive in writing of its intent
     to contest such denial or refund prior to the expiration of 30 calendar
     days after such determination, then such advance shall be forgiven and
     shall not be required to be repaid and the amount of any such advance shall
     offset, to the extent thereof, the amount of Gross-Up Payment required to
     be paid by Employer to Executive pursuant to this Section 10(d).

          (viii)  Any information provided by Executive to Employer under this
     Section 10(d) shall be treated confidentially by Employer and will not be
     provided by Employer to any other person than Employer's professional
     advisors without Executive's prior written consent except as required by
     law.

     (e) Term.  Notwithstanding the provisions of Section 3, if a Change in
Control occurs prior to the termination of this Agreement, Sections 10, 11 and
12 shall continue in effect for a period of 24 months after the date of the
Change in Control.

     (f) No Duty to Mitigate Damages.  Executive's rights and privileges under
this Section 10 shall be considered severance pay in consideration of his past
service and his continued service to Employer from the Commencement Date, and
his entitlement thereto shall neither be governed by any duty to mitigate his
damages by seeking further employment nor offset by any compensation that he may
receive from future employment.

     (g) Arbitration.  Any controversy or claim arising out of or relating to
this Section 10, or the breach thereof, shall be settled exclusively by
arbitration in Austin, Texas, in accordance with the Commercial Arbitration
Rules of the American Arbitration Association then in effect.  Judgment upon the
award rendered by the arbitrator may be entered in, and enforced by, any court
having jurisdiction thereof.

                                       11
<PAGE>

     (h) No Right To Continued Employment.  This Section 10 shall not give
Executive any right of continued employment or any right to compensation or
benefits from Employer except the rights specifically stated herein.

     (i) Restricted Stock and Exercise of Stock Options.  Executive may hold
options ("Options") issued under the Incentive Plan and such Options shall
become immediately exercisable upon a Change in Control.  In addition, Executive
may hold restricted stock ("Restricted Stock") issued under the Incentive Plan,
and all applicable restrictions shall lapse upon a Change in Control.  Employer
shall take no action to facilitate a transaction involving a Change in Control,
including without limitation redemption of any rights issued pursuant to any
rights agreement, unless it has taken such action as may be necessary to ensure
that Executive has the opportunity to exercise all Options he may then hold, and
obtain certificates containing no restrictive legends in respect of any
Restricted Stock he may then hold, at a time and in a manner that shall give
Executive the opportunity to sell or exchange the securities of Employer
acquired upon exercise of his Options and upon receipt of unrestricted
certificates for shares of Common Stock in respect of his Restricted Stock, if
any (collectively, the "Acquired Securities"), at the earliest time and in the
most advantageous manner any holder of the same class of securities as the
Acquired Securities is able to sell or exchange such securities in connection
with such Change in Control.  Employer acknowledges that its covenants in the
preceding sentence (the "Covenants") are reasonable and necessary in order to
protect the legitimate interests of Employer in maintaining Executive as one of
its employees and that any violation of the Covenants by Employer would result
in irreparable injuries to Executive, and Employer therefore acknowledges that
in the event of any violation of the Covenants by Employer or its directors,
officers or employees, or any of their respective agents, Executive shall be
entitled to obtain from any court of competent jurisdiction temporary,
preliminary and permanent injunctive relief in order to (i) obtain specific
performance of the Covenants, (ii) obtain specific performance of the exercise
of his Options, delivery of certificates containing no restrictive legends in
respect of his Restricted Stock and the sale or exchange of the Acquired
Securities in the advantageous manner contemplated above or (iii) prevent
violation of the Covenants; provided nothing in this Agreement shall be deemed
to prejudice Executive's rights to damages for violation of the Covenants.

     (j)  Coordination With Other Payments.

          (i) After the termination of Executive's employment hereunder:

               (1) if Executive is entitled to receive Separation Payments; and

               (2) Executive subsequently becomes entitled to receive a
          Termination Payment, Gross Up Payment or both, then,

          (ii) prior to the disbursement of the Termination Payment and Gross Up
          Payment:

               (1) the payment date of all unpaid Separation Payments shall be
          accelerated to the payment date of the Termination Payment and such
          Separation Payments shall be made (in this event, Employer waives any
          requirement that Executive reduce the Separation Payments by the
          amount of any income earned by Executive thereafter); and

               (2) the Termination Payment shall be reduced by the amount of the
          Separation Payments so accelerated and made.

                                       12
<PAGE>

     (k) Outplacement Services.  If Executive becomes entitled to receive a
Termination Payment under this Section 10, Employer agrees to reimburse
Executive for the amount of any outplacement consulting fees and expenses
incurred by Executive during any Applicable Period and during the two-year
period following the Change In Control; provided that the aggregate amount
reimbursed by Employer shall not exceed 15% of the amount determined pursuant to
Section 10(b)(i)(1).  In addition and as to each reimbursement payment, to the
extent that any reimbursement under this Section 10(k) is subject to federal,
state or local income taxes, Employer shall pay Executive an additional amount
such that the net amount retained by Executive, after deduction of any federal,
state and local income tax on the reimbursement and such additional amount,
shall be equal to the reimbursement payment.  All amounts under this Section
10(k) shall be paid by Employer within 15 days after Executive's presentation to
Employer of any statements of such amounts and thereafter shall bear interest at
the rate of 18% per annum or, if different, the maximum rate allowed by law
until paid by Employer, and all accrued and unpaid interest shall bear interest
at the same rate, all of which interest shall be compounded daily.

     SECTION 11.  General.

     (a) Notices.  All notices and other communications hereunder shall be in
writing or by written telecommunication, and shall be deemed to have been duly
given if delivered personally or if mailed by certified mail, return receipt
requested or by written telecommunication, to the relevant address set forth
below, or to such other address as the recipient of such notice or communication
shall have specified to the other party in accordance with this Section 11(a):

     If to Employer, to:                   with a copy to:

     Luminex Corporation                   Thompson & Knight L.L.P.
     12212 Technology Blvd.                98 San Jacinto Blvd., Suite 1200
     Austin, Texas 78727                   Austin, Texas 78701
     Attention:  General Counsel           Attention:  Craig Adams
     Facsimile Number: (512) 219-5195      Facsimile Number (512) 469-6180

     If to Executive, to:

     12212 Technology Blvd.
     Austin, Texas 78727

     (b) Withholding; No Offset.  All payments required to be made to Executive
by Employer under this Agreement shall be subject to the withholding of such
amounts, if any, relating to federal, state and local taxes as may be required
by law.  No payments under Section 10 shall be subject to offset or reduction
attributable to any amount Executive may owe to Employer or any other person.

     (c) Legal and Accounting Costs.  Employer shall pay all attorneys' and
accountants' fees and costs incurred by Executive as a result of any breach by
Employer of its obligations under this Agreement, including without limitation
all such costs incurred in contesting or disputing any determination made by
Employer under Section 10 or in connection with any tax audit or proceeding to
the extent attributable to the application of Section 4999 of the Code to any
payment under Section 10.  Reimbursements of such costs shall be made by
Employer within 15 days after Executive's presentation to Employer of any
statements of such costs and thereafter shall bear interest at the rate of 18%
per annum or, if different, the maximum rate allowed by law until paid by
Employer, and all accrued and unpaid interest shall bear interest at the same
rate,

                                       13
<PAGE>

all of which interest shall be compounded daily.

     (d) Equitable Remedies.  Each of the parties hereto acknowledges and agrees
that upon any breach by Executive of his obligations under any of Sections 7, 8
and 9, Employer shall have no adequate remedy at law and accordingly shall be
entitled to specific performance and other appropriate injunctive and equitable
relief.

     (e) Severability.  If any provision of this Agreement is held to be
illegal, invalid or unenforceable, such provision shall be fully severable, and
this Agreement shall be construed and enforced as if such illegal, invalid or
unenforceable provision never comprised a part hereof, and the remaining
provisions hereof shall remain in full force and effect and shall not be
affected by the illegal, invalid or unenforceable provision or by its severance
herefrom.  Furthermore, in lieu of such illegal, invalid or unenforceable
provision, there shall be added automatically as part of this Agreement a
provision as similar in its terms to such illegal, invalid or unenforceable
provision as may be possible and be legal, valid and enforceable.

     (f) Waivers.  No delay or omission by either party in exercising any right,
power or privilege hereunder shall impair such right, power or privilege, nor
shall any single or partial exercise of any such right, power or privilege
preclude any further exercise thereof or the exercise of any other right, power
or privilege.

     (g) Counterparts.  This Agreement may be executed in multiple counterparts,
each of which shall be deemed an original, and all of which together shall
constitute one and the same instrument.

     (h) Captions.  The captions in this Agreement are for convenience of
reference only and shall not limit or otherwise affect any of the terms or
provisions hereof.

     (i) Reference to Agreement.  Use of the words "herein," "hereof," "hereto,"
"hereunder" and the like in this Agreement refer to this Agreement only as a
whole and not to any particular section or subsection of this Agreement, unless
otherwise noted.

     (j) Binding Agreement.  This Agreement shall be binding upon and inure to
the benefit of the parties and shall be enforceable by the personal
representatives and heirs of Executive and the successors and assigns of
Employer.  This Agreement may be assigned by the Company or any Employer to any
Employer; provided that in the event of any such assignment, the Company shall
remain liable for all of its obligations hereunder and shall be liable for all
obligations of all such assignees hereunder.  If Executive dies while any
amounts would still be payable to him hereunder, such amounts shall be paid to
Executive's estate.  This Agreement is not otherwise assignable by Executive.

     (k) Entire Agreement; Effect on Prior Agreement.  This Agreement contains
the entire understanding of the parties, supersedes all prior agreements and
understandings relating to the subject matter hereof (including without
limitation the Prior Agreement, which is hereby terminated) and may not be
amended except by a written instrument hereafter signed by each of the parties
hereto. Executive and the Company hereby agree that, if any other employment
agreement between Executive and the Company (or any other Employer) is in
existence on the Commencement Date, then this Agreement shall supersede such
other employment agreement in its entirety, and such other employment agreement
shall no longer be of any force and effect after the date hereof.

     (l) Governing Law.  This Agreement and the performance hereof shall be
construed and governed in accordance with the laws of the State of Texas,
without regard to its choice of law principles.

                                       14
<PAGE>

     (m) Gender and Number.  The masculine gender shall be deemed to denote the
feminine or neuter genders, the singular to denote the plural, and the plural to
denote the singular, where the context so permits.

     (n) Assistance in Litigation.  During the term of this Agreement and for a
period of two years thereafter, Executive shall, upon reasonable notice, furnish
such information and proper assistance to Employer as may reasonably be required
by Employer in connection with any litigation in which Employer is, or may
become, a party and with respect to which Executive's particular knowledge or
experience would be useful.  Employer shall reimburse Executive for all
reasonable out-of-pocket expenses incurred by Executive in rendering such
assistance.  The provisions of this Section 11(n) shall continue in effect
notwithstanding termination of Executive's employment hereunder for any reason.

     SECTION 12.  Definitions.  As used in this Agreement, the following terms
will have the following meanings:

     (a) Accounting Firm has the meaning ascribed to it in Section 10(d)(ii).

     (b) Acquired Securities has the meaning ascribed to it in Section 10(i).

     (c) Agreement has the meaning ascribed to it in the heading of this
document.

     (d) Applicable Period means, with respect to any Change In Control, the
period of 27 months commencing 3 months before the Change In Control and ending
24 months after the Change In Control.

     (e) Base Salary has the meaning ascribed to it in Section 4(a).

     (f) Cause has the meaning ascribed to it in Section 6(a)(ii).

     (g) Change In Control has the meaning ascribed to it in Section 10(c).

     (h) Code means the Internal Revenue Code of 1986, as amended.

     (i) Commencement Date has the meaning ascribed to it in Section 3.

     (j) Company means Luminex Corporation, a Delaware corporation.

     (k) Confidential Information has the meaning ascribed to it in Section
8(b).

     (l) Constructively Terminated with respect to an Executive's employment
with Employer will be deemed to have occurred if Employer:

          (i) demotes Executive to a lesser position, either in title or
     responsibility, than the highest position held by Executive with Employer
     at any time during Executive's employment with Employer;

          (ii) decreases Executive's compensation below the highest level in
     effect at any time during Executive's employment with Employer or reduces
     Executive's benefits and perquisites

                                       15
<PAGE>

     below the highest levels in effect at any time during Executive's
     employment with Employer (other than as a result of any amendment or
     termination of any employee or group or other executive benefit plan, which
     amendment or termination is applicable to all executives of Employer); or

          (iii)  requires Executive to relocate to a principal place of business
     more than 30 miles from the principal place of business occupied by
     Employer on the first day of an Applicable Period.

     (m) Covenants has the meaning ascribed to it in Section 10(i).

     (n) Designated Industry has the meaning ascribed to it in Section
9(a)(i)(1).

     (o) Determination has the meaning ascribed to such term in Section 1313(a)
of the Code.

     (p) Disability with respect to Executive shall be deemed to have occurred
whenever Executive is rendered unable to engage in any substantial gainful
activity by reason of any medically determinable physical or mental impairment
that can be expected to result in death or that has lasted or can be expected to
last for a continuing period of not less than 12 months.  In the case of any
dispute, the determination of Disability will be made by a licensed physician
selected by Employer, which physician's decision will be final and binding.

     (q) Executive has the meaning ascribed to it in the heading of this
Agreement.

     (r) Employer refers collectively to the Company and its subsidiaries and
other affiliates.  In Section 10, the term "Employer" shall be deemed to refer
to the Company, and for purposes of Section 10, Executive shall be deemed to be
employed by the Company and all compensation and benefits paid or provided to
Executive by any Employer under this Agreement at any time shall be deemed to
have been paid or provided to Executive by the Company.

     (s) Entity has the meaning ascribed to it in Section 10(l)(i)(1).

     (t) Exchange Act has the meaning ascribed to it in Section 10(c)(iii).

     (u) Excise Tax has the meaning ascribed to it in Section 10(d)(i).

     (v) Good Reason means the termination of Executive's employment with
Employer as a result of Executive's commission of a felony or failure to obey
lawful and proper written directions delivered to Executive by Employer's
Chairman of the Board, President, Chief Executive Officer or its Board of
Directors.

     (w) Gross Up Payment has the meaning ascribed to it in Section 10(d)(i).

     (x) Incentive Plans means any stock option or equity incentive plan adopted
by Employer from time to time.

     (y) Inventions has the meaning ascribed to it in Section 7(a).

     (z) ISO has the meaning ascribed to it in Section 10(d)(i).

     (aa) Options has the meaning ascribed to it in Section 10(i).

                                       16
<PAGE>

     (bb) Parachute Payments has the meaning ascribed to such term in Section
280G(b)(2) of the Code.

     (cc) Payment has the meaning ascribed to it in Section 10(d)(i).

     (dd) Restricted Stock has the meaning ascribed to it in Section 10(i).

     (ee) Separation Payment Period has the meaning ascribed to it in Section
6(b)(ii).

(ff) Separation Payments has the meaning ascribed to it in Section 6(b)(ii).

     (gg) Target Bonus means, with respect to each Executive, the dollar amount
that is equal to the established percentage of such Executive's Base Salary that
would be paid to Executive under the management incentive bonus plan of Employer
assuming the measurement criteria contained in such plan with respect to
Executive were achieved for the Bonus Period in which the Change In Control
occurred.

     (hh) Termination Payment has the meaning ascribed to it in Section
10(b)(i).

     (ii) Triggering Termination has the meaning ascribed to it in Section
10(a).

     (jj) Underpayment has the meaning as ascribed to it in Section 10(d)(ii).

                                       17
<PAGE>

     EXECUTED as of the date and year first above written.

                              LUMINEX CORPORATION

                              By:  ______________________________________
                                    Mark Chandler
                                    President and Chief Executive Officer

                                   ______________________________________

                                      18
<PAGE>
<TABLE>
<CAPTION>
    Executive                            Office                                Commencement Date                    Base Salary
    ---------                            ------                                -----------------                    -----------
<S>                                <C>                                       <C>                                      <C>
Mark B. Chandler, Ph.D.            President and Chief                       this Agreement                           275,000
                                   Executive Officer

Michael L. Bengtson                Executive Vice President,                 that certain Underwriting                250,000
                                   General Counsel and Secretary             Agreement between Warburg
                                                                             Dillon Read LLC, Lehman
                                                                             Brothers Inc. and Dain Rauscher
                                                                             Incorporated, as representatives
                                                                             of the underwriters, and the
                                                                             Company

Ralph L. McDade, M.D.              Vice President of Scientific Affairs      this Agreement                           190,000

Van S. Chandler                    Vice President of Instruments             this Agreement                           190,000

Michael D. Spain, M.D.             Vice President of Clinical Affairs        this Agreement                           190,000

James L. Persky                    Vice President, Treasurer and             this Agreement                           180,000
                                   Chief Financial Officer

Randel S. Marfin                   Vice President of Business Development    this Agreement                           160,000

</TABLE>MASTER AGREEMENT

         This Master Agreement (the  "Agreement") is made and entered into as of
this 18th day of February,  2000 (the "Effective  Date"), by and between Summus,
Ltd., a Delaware corporation ("Summus"),  and High Speed Net Solutions,  Inc., a
Florida corporation ("HSNS"):

         1.   Summus and HSNS have previously  entered into a Marketing  License
              Agreement  ("MLA")  dated  in February of 1999 and certain Related
              Agreements.  "Related  Agreements" means agreements between Summus
              and HSNS  related  to or  incorporated  by the MLA and  agreements
              based on either Summus' or HSNS's rights and obligations under the
              MLA,   including,   but  not  limited  to,  the  Letter  Agreement
              incorporated by the MLA and any agreements  relating to or arising
              from  opportunities  to sell or license  products  or  services to
              Samsung.

         2.   The MLA  contemplated  that HSNS will act as a reseller  of Summus
              products.  The parties  have  concluded  that it would be to their
              mutual benefit, instead, for HSNS to primarily use Summus products
              and services to conduct a service bureau business and for HSNS and
              Summus  to share  revenues  derived  from  each  party's  business
              activity with Summus' products. As a service bureau, HSNS will not
              act as a reseller of Summus' products.

         3.   In order to enable the proposed  service  bureau  business of HSNS
              and proposed revenue sharing between the parties,  Summus and HSNS
              hereby  agree  to  enter  into  the  Software  License  Agreement,
              Software  Maintenance  Agreement,  and Revenue  Sharing  Agreement
              attached to this  Agreement  as Exhibits A, B, and C  respectively
              (collectively,  the "New Agreements"). Terms not otherwise defined
              herein shall have the meanings specified in the New Agreements.

         4.   Upon  execution  of the New  Agreements,  the MLA and the  Related
              Agreements  shall  terminate  and have no further force or effect.
              Neither  party shall have any  obligation  of further  performance
              under the MLA or the Related Agreements.

         5.   "License  Fee  Credit"  - shall  mean the  amount  of One  Million
              Dollars  ($1,000,000)  as a one-time  credit  granted  Customer by
              Licensor  in  recognition  of  payments  made  under the MLA.  The
              License Fee Credit shall be applied against license fees due under
              the Software License Agreement.

         6.   "Revenue  Based Fee Credit" - shall mean the amount of One Million
              Dollars  ($1,000,000) as a one-time credit granted the Customer by
              Licensor  in  recognition  of  payments  made  under the MLA.  The
              Revenue  Based Fee Credit shall be applied  against  Revenue Based
              Fee  payments  due from  Customer to Licensor  under the  Software
              License Agreement.
<PAGE>
         7.   "Annual  Maintenance  Fee  Credit" - shall  mean the amount of One
              Hundred Fifty  Thousand  Dollars  ($150,000) as a one-time  credit
              granted to the  Customer by Licensor  in  recognition  of payments
              made  under the MLA.  The  Annual  Maintenance  Fee  Credit may be
              applied  against  payments due from Customer to Licensor under the
              Software Maintenance Agreement.

         8.   "Customer  Credit"  - shall  mean  any  amounts  to be paid to the
              Customer  by the  Licensor  as a  result  of the  Revenue  Sharing
              Agreement,  Exhibit  C, in  excess  of  amounts  to be paid to the
              Licensor  by the  Customer  as a result of the  Revenue Fee in the
              Software License Agreement, Exhibit A. Such Customer Credit may be
              used at the  discretion  of the Customer to pay any charges due to
              Licensor in connection with the New Agreements.

         9.   Any portion of the Customer  Credit that is not  credited  against
              payments  due to  Licensor  shall be  available  to Customer to be
              applied  against  purchase of other  products  and/or  services of
              Licensor.  In the event that the  Software  License  Agreement  is
              terminated by Customer for material failure of Licensor to deliver
              (including  the cure period of 60 days) the  products as described
              in Exhibit A.1, the License Fee Credit,  Revenue Based Fee Credit,
              and Annual Maintenance Fee Credit shall increase by 1.5% per month
              for up to  twelve  (12)  months  or until  such  time as  Customer
              selects  other  products  and/or  services  of Licensor to be paid
              through the application of the Credit, whichever occurs first.
               Customer  and  Licensor  shall  cooperate  to select  such  other
              products or  services  of Licensor  promptly in order to apply the
              credits without undue delay, but Customer shall not be required to
              apply the credits  against  products  and/or services that are not
              needed or useful in Customer's business.

         10.  Licensor  will  provide to Customer  additional  resource  support
              through  provision of ancillary  services,  in an approximate fair
              market value of Two Hundred Fifty Thousand Dollars ($250,000). The
              ancillary  services may consist of, at the discretion of Licensor,
              cash payments,  credits against charges due for services under the
              New Agreements,  computer hardware, third party software licenses,
              or other  services  requested by Customer.  Licensor shall provide
              the ancillary services reasonably  requested by Customer in prompt
              commercial  fashion.  The total  value of all  ancillary  services
              provided,  whether delivered in cash, services, or products, shall
              be deemed to be an  advance  amount to be offset by  payments  due
              Customer from  Licensor  under the Revenue  Sharing  Agreement and
              shall be  accounted  for  without  interest  or any other  charges
              whatsoever.   To  the  extent  any  Customer  Credit  amounts  are
              available,  Customer may at its sole discretion apply such amounts
              to reduce the ancillary service advance amount total.

         11.  This Agreement  shall be construed and enforced in accordance with
              the laws of the State of North Carolina, but without giving effect
              to its laws or rules  relating to conflicts of laws.  In the event
              of any dispute or controversy  arising under or in connection with
              this  Agreement  or any  New  Agreement,  the  dispute  resolution
              procedures set forth in Exhibit A shall be followed
<PAGE>

         12.  Any dispute or  controversy  arising under or in  connection  with
              this Agreement  shall be settled in Wake County,  North  Carolina.
              The   parties   hereby   generally   submit  to  the  in  personam
              jurisdiction  of the Superior Court of the State of North Carolina
              and the Federal  District Court for the Eastern  District of North
              Carolina located in Wake County.

         13.  This 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.

         14.  This   Agreement   and  the  New   Agreements   contain  the  full
              understanding   of  the  parties  and   supersede   all  prior  or
              contemporaneous  agreements and  understandings,  written or oral,
              between the  parties  with  respect to the subject  matter of this
              Agreement;   and   there  are  no   representations,   warranties,
              agreements or understandings  other than those expressly contained
              herein. No alteration,  modification,  variation or waiver of this
              Agreement,  or any of the  provisions  hereof  shall be  effective
              unless executed by both parties in writing.

SUMMUS, LTD.                                     HIGH SPEED NET SOLUTIONS, INC.

By: /s/ Dr. Bjorn Jawerth                        By:   /s/ Andrew L. Fox
(Signature)                                              (Signature)

Date: March 13, 2000                            Date:  February 18, 2000

Name: Dr. Bjorn Jawerth                         Name:   Andrew L. Fox

Title: CEO                                      Title:  Acting President and
                                                        CEO, Executive Vice
                                                        President

<PAGE>

                                    EXHIBIT A

                           SOFTWARE LICENSE AGREEMENT

<PAGE>

                                    EXHIBIT B

                         SOFTWARE MAINTENANCE AGREEMENT

<PAGE>

                                    EXHIBIT C

                            REVENUE SHARING AGREEMENT

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