Document:

<PAGE>   1
                                                                   EXHIBIT 10.14

                                 AMENDMENT NO. 2
                                       TO
                          EQUIPMENT PURCHASE AGREEMENT

                  Reference is hereby made to that Equipment Purchase Agreement
(the "Agreement") effective as of December 1, 1995 between PageMart Wireless,
Inc. ("PageMart") and Motorola, Inc. ("Motorola"). Capitalized terms used but
not otherwise defined herein shall have the meanings ascribed thereto in the
Agreement.

                  WHEREAS, PageMart and Motorola have agreed to modify the
Agreement;

                  NOW THEREFORE, the parties hereby agree as follows:

ARTICLE IV: SECTION 1.3 CREDIT FOR ADVANCED MESSAGING SUBSCRIBER UNITS, IS
HEREBY AMENDED TO READ IN ITS ENTIRETY, AS FOLLOWS:

         1.3 Credit for Advanced Messaging Subscriber Units. As described here
and in Article III, Section 1, as additional consideration for the transfer of
the PageMart Patents to Motorola in accordance with the Technology Asset
Agreement between the parties, Motorola agrees to furnish at no cost to
PageMart, credit for an additional $1.5 million of two-way advanced messaging
subscriber equipment (priced at the purchase prices of this Agreement), applied
on a pro-rata basis to PageMart's purchase of its first $5 million of two-way
messaging subscriber Equipment from Motorola during the term of this Agreement.
PageMart will be entitled to credit each month for a proportionate amount of
subscriber Equipment in addition to the first $5 million, based upon the
subscriber Equipment purchased to date through that month.

PageMart has issued to Motorola an initial Purchase Order for 5,000 (five
thousand) ReFLEX25 advanced messaging subscriber units and will provide one or
more additional Purchase Orders for 20,000 (twenty thousand) ReFLEX25 advanced
messaging units, when they are commercially available. Since Motorola has been
unable to deliver and certify as commercial by June 15, 1998, the ReFLEX25
advanced messaging subscriber Equipment in the first Purchase Order, the October
31, 1999 date in Section 1.1 of Article IV of the Agreement shall be extended
for the period of time that commercial availability is delayed beyond June 15,
1998, up to a maximum extension of one year.

Date of Modification: August 5, 1998

PAGEMART WIRELESS, INC.                    MOTOROLA, INC.

By: /s/ N. ROSS BUCKERHAM                  By: /s/ JULIE A. SHIMER
   ------------------------------             ----------------------------------
Name: N. Ross Buckerham                    Name: Julie A. Shimer
     ----------------------------               --------------------------------
Title: President                           Title: VP & GM NAPSD
      ---------------------------                -------------------------------
Date: 8/15/98                              Date: 8/5/98
     ----------------------------               --------------------------------<PAGE>   1
                                                                   EXHIBIT 10.15

                                 AMENDMENT NO.3
                                       TO
                          EQUIPMENT PURCHASE AGREEMENT

          Reference is hereby made to that EQUIPMENT PURCHASE AGREEMENT (the
"Agreement"), effective as of December 1, 1995, between PageMart, Inc.
("PageMart") and Motorola, Inc. ("Motorola"), as amended by Amendment No. 1
dated June 15, 1998, and by Amendment No. 2 dated August 5, 1998. Capitalized
terms used but not otherwise defined herein shall have the meanings ascribed
thereto in the Agreement.

          WHEREAS, PageMart and Motorola have agreed to modify the Agreement;

          NOW THEREFORE, the parties hereby agree as follows:

ARTICLE IV: SECTION 1.1, BUYER PURCHASE COMMITMENT, IS HEREBY AMENDED TO READ IN
ITS ENTIRETY, AS FOLLOWS:

1.1 Buyer Purchase Agreement. PageMart agrees to purchase from Motorola $40
million of conventional one-way and two-way infrastructure Equipment (and/or
ReFLEX 25 advanced messaging units provided for by this Amendment No. 3) over
the sixty-seven (67) month period beginning December 1, 1995 and ending June 30,
2001. In the event PageMart fails to order and take delivery from Motorola of
$40 million of infrastructure Equipment (and/or ReFLEX 25 advanced messaging
units provided for by this Amendment No. 3) prior to June 30, 2001, provided any
failure to take delivery is not due to Force Majeure as described in Section
15.1 of Article I, or to Motorola's failure to meet reasonable scheduled
delivery dates for ReFLEX 25 advanced messaging units, then on or after July 1,
2001, Motorola may prepare an invoice for, and ship to PageMart, ReFLEX 25
advanced messaging units chosen at Motorola's sole discretion, with a total
price (priced at the purchase prices of this Agreement) equivalent to the
difference between $40 million and the amount of infrastructure Equipment (and
ReFLEX 25 advanced messaging units provided for by this Amendment No. 3)
previously ordered by PageMart and delivered under this Agreement. PageMart
agrees to accept such Products and to pay such invoice within thirty (30) days
of its receipt. After the Date of Modification of this Amendment No. 3, only the
following order shall apply towards PageMart's $40 million purchase commitment:

(A) On or before August 31, 1999, PageMart shall issue to Motorola, an initial
Purchase Order for additional ReFLEX 25 advanced messaging units, in an amount
of no less than $1.4 million, for delivery to PageMart prior to December 31,
1999, as per customer requirements. PageMart shall subsequently issue additional
purchase orders to Motorola for ReFLEX 25 advanced messaging units. Products
procured by Purchase Orders under this Amendment shall be for delivery to
PageMart prior to June 30, 2001. Notwithstanding the language of Section 1.2
Credit for Infrastructure Equipment and Section 1.4 Additional Infrastructure
Credit, for PageMart's purchases of ReFLEX 25 advanced messaging units from
Motorola by the Purchase Orders described in this Section 1.1(A), PageMart's
remaining credit for the transfer of PageMart Patents to Motorola in accordance
with the Technology Asset Agreement between the parties, shall be applied as a
total discount of 30% towards the sales price, resulting in a total remaining
credit balance of $5,265,000. Such credit application shall wholly satisfy all
credits provided to PageMart by the Agreement.

THIS AMENDMENT NO. 3 DOES NOT ALTER THE PURCHASE COMMITMENTS FOR REFLEX 25
ADVANCED MESSAGING UNITS SPECIFIED IN AMENDMENT NO. 2 DATED AUGUST 5, 1998, AND
THE CREDITS PROVIDED THEREIN ARE SEPARATE FROM AND SHALL NOT AFFECT THE CREDITS
PROVIDED ELSEWHERE IN THE AGREEMENT.

Date of Modification: September 20, 1999.

PAGEMART WIRELESS INC.                  MOTOROLA, INC.

By: /s/ G. CLAY MYERS                   By: /s/ MIGUEL PELLON
   --------------------------------        -------------------------------

Name: G. Clay Myers                     Name: Miguel Pellon
     ------------------------------          -----------------------------

Title: CFO                              Title: VP & GM US Paging Ops.
      -----------------------------           ----------------------------

Date: 8/20/99                           Date: 10/4/99
     ------------------------------          -----------------------------<PAGE>   1
                                                                   EXHIBIT 10.18

                             WEBLINK WIRELESS, INC.

                     NONQUALIFIED FORMULA STOCK OPTION PLAN

                           FOR NON-EMPLOYEE DIRECTORS

<PAGE>   2

                             WEBLINK WIRELESS, INC.
                     NONQUALIFIED FORMULA STOCK OPTION PLAN
                           FOR NON-EMPLOYEE DIRECTORS

                                Table of Contents

<TABLE>
<CAPTION>
                                                                         Page
                                                                         ----
<S>         <C>                                                          <C>
ARTICLE I - Purpose and Administration...................................  1
         1.1      Purpose................................................  1
         1.2      Administration.........................................  1
         1.3      Participation..........................................  2
         1.4      Stock Subject to the Plan..............................  2
         1.5      Restrictions on Exercise...............................  2

ARTICLE II - Stock Options...............................................  3
         2.1      Grant and Option Price.................................  3
         2.2      Stock Option Agreement.................................  4
         2.3      Option Period..........................................  4
         2.4      Vesting and Exercise of Options........................  4
         2.5      Nontransferability of Options..........................  5
         2.6      Termination of Directorship............................  5
         2.7      Issuance of Stock Certificates........................   7

ARTICLE III - Other Provisions..........................................   7
         3.1      Adjustments Upon Changes in Capitalization............   7
         3.2      Acceleration..........................................   9
         3.3      Continuation of Directorship..........................  11
         3.4      Amendment and Termination.............................  11
         3.5      Time of Exercise......................................  12
         3.6      Privileges of Stock Ownership and
                    Non-Distributive Intent.............................  12
         3.7      Effective Date of the Plan............................  12
         3.8      Expiration............................................  12
         3.9      Governing Law.........................................  12
         3.10     Application of Funds..................................  12
         3.11     No Liability for Good Faith Determinations............  13
         3.12     Execution of Receipts and Releases....................  13
         3.13     No Guarantee of Interests.............................  13
         3.14     Payment of Expenses...................................  13
         3.15     Corporate Records.....................................  13
         3.16     Information...........................................  13
         3.17     No Liability of Corporation...........................  14
         3.18     Corporate Action......................................  14

</TABLE>

<PAGE>   3

<TABLE>
         <S>      <C>                                                     <C>

         3.19     Severability..........................................  14
         3.20     Notice................................................  14
         3.21     Waiver of Notices.....................................  15
         3.22     Successors............................................  15
         3.23     Headings..............................................  15
         3.24     Word Usage............................................  15

</TABLE>

<PAGE>   4

                             WEBLINK WIRELESS, INC.
                     NONQUALIFIED FORMULA STOCK OPTION PLAN
                           FOR NON-EMPLOYEE DIRECTORS

                                    ARTICLE I

                           Purpose and Administration

Section 1.1   Purpose. The purpose of the WebLink Wireless, Inc. Nonqualified
Formula Stock Option Plan for Non-Employee Directors (the "Plan") is to
strengthen WebLink Wireless, Inc. (the "Corporation") by providing a means of
retaining and attracting competent non-employee personnel to serve on its board
of directors by extending to certain such individuals added long-term incentives
for high levels of performance and for unusual efforts designed to improve the
financial performance of the Corporation. In order to effectuate this intent,
the Corporation will, pursuant to this Plan, grant to each eligible non-employee
director the option to acquire shares of common stock of the Corporation
("Common Stock"), which options shall vest over a specified period of time.

Section 1.2   Administration. The Plan shall be administered by the compensation
committee (the "Committee") of the Board of Directors of the Corporation (the
"Board").

         Subject to the express provisions of the Plan, the Committee shall have
powers and authorities which are exclusively ministerial in nature, including
the authority to construe and interpret the Plan, to define the terms used in
the Plan, to prescribe, amend and rescind rules and regulations relating to the
administration of the Plan, and to make all other determinations necessary or
advisable for the administration of the Plan. The determinations of the
Committee on all matters referred to in this Plan shall be

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<PAGE>   5
conclusive. The Committee shall not be liable for any action, failure to act,
determination or interpretation made in good faith with respect to the Plan or
any transaction under the Plan.

Section 1.3   Participation. Each member of the Board who (i) is not employed by
the Corporation or any Affiliate and (ii) owns one percent (1%) or less of the
Corporation's Common Stock at the time of any grant hereunder (collectively, the
"Non-Employee Directors") shall be eligible and shall participate in the Plan.
For purposes of the Plan, the term "Affiliate" shall mean a "parent
corporation", as such term is defined in Section 424(e) of the Internal Revenue
Code, as amended (the "Code"), or a "subsidiary corporation", as such term is
defined in Section 424(f) of the Code.

Section 1.4   Stock Subject to the Plan. Subject to adjustment as provided in
Section 3.1 hereof, the stock to be offered under the Plan shall be treasury
shares or shares of the Corporation's authorized but unissued Common Stock
(hereinafter collectively called "Stock"). The aggregate number of shares of
Stock to be issued upon exercise of all options granted under the Plan shall not
exceed 300,000 shares, subject to adjustments as set forth in Sections 3.1 and
3.2 hereof. If any option granted hereunder shall lapse or terminate for any
reason without having been fully exercised, the shares subject thereto shall
again be available for purposes of the Plan.

Section 1.5   Restrictions on Exercise . No option granted hereunder may be
exercised unless and until the Committee determines that such exercise will be
made in compliance with all applicable laws, rules and regulations, including,
without limitation, applicable securities laws, rules and regulations. The
Corporation does not have any obligation to take any action to register or
qualify shares of Common Stock pursuant to applicable

                                       2
<PAGE>   6

securities laws or to perfect an exemption from such registration/qualification
requirements.

                                   ARTICLE II

                                  Stock Options

Section 2.1   Grant and Option Price.

         (a)  On the effective date of this Plan, each existing Non-Employee
         Director shall be granted an option to purchase 25,000 shares of Stock.
         Thereafter, on the day a Non-Employee Director is first elected or
         appointed to the Board, such Non-Employee Director shall be granted an
         option to purchase 25,000 shares of Stock.

         (b)  On each subsequent third anniversary of the date of grant,
         each Non-Employee Director who was previously elected to the Board and
         who continues to serve in such capacity, shall be granted an option to
         purchase an additional 25,000 shares of Stock.

         (c)  The purchase price of the Stock covered by each option granted
         under the Plan shall be equal to the Fair Market Value of such Stock on
         the date of grant. For purposes of the Plan, the term "Fair Market
         Value" on any date shall mean: (i) if the Stock is listed or admitted
         to trade on a national securities exchange, the closing price of the
         Stock on the Composite Tape, as published in the Wall Street Journal,
         of the principal national securities exchange on which the Stock is so
         listed or admitted to trade, on such date or, if there is no trading of
         the Stock on such date, then the closing price of the Stock as quoted
         on such Composite Tape on the next preceding date on which there was
         trading in such

                                       3
<PAGE>   7

         shares; (ii) if the Stock is not listed or admitted to trade on a
         national securities exchange, then the closing price of the Stock as
         quoted on the National Market System of the National Association of
         Securities Dealers, Inc. ("NASD") on such date; (iii) if the Stock is
         not listed to trade on the National Market System of the NASD, the mean
         between the bid and asked price for the Stock on such date, as
         furnished by the NASD through NASDAQ or a similar organization if
         NASDAQ is no longer reporting such information; or (iv) if the Stock is
         not listed or admitted to trade on a national securities exchange and
         if bid and asked prices for the Stock are not so furnished by the NASD
         or a similar organization, the values established by the Committee for
         purposes of granting options under the Plan. In addition to the above
         rules, Fair Market Value shall be determined without regard to any
         restriction other than a restriction which, by its terms, will never
         lapse.

Section 2.2   Stock Option Agreement. Each option granted pursuant to the Plan
shall be evidenced by a Stock Option Agreement ("Option Agreement"), in such
form as the Committee shall require, between the Corporation and the
Non-Employee Director to whom the option has been granted (the "Optionee").

Section 2.3   Option Period. Except as otherwise provided herein, each option
and all rights or obligations thereunder shall expire on the tenth anniversary
of the date of grant (the "Expiration Date"), and shall be subject to earlier
termination as hereinafter provided.

Section 2.4   Vesting and Exercise of Options.

         (a)  Subject to Section 3.2 hereof, an option granted hereunder
         shall be exercisable only to the extent of shares that have vested.
         Shares shall vest hereunder as to 1/12 of each grant as of the last day
         of the first calendar quarter

                                       4
<PAGE>   8

         following the date of the grant, with an additional 1/12 of such grant
         to vest as of the last day of each calendar quarter subsequent thereto.

         (b)  The purchase price of the Stock purchased upon exercise of an
         option shall be paid in full in cash or by check at the time of each
         exercise of an option or by such other consideration as may be provided
         for by the Committee in the Option Agreement; provided, however, that
         if the Option Agreement so provides and upon receipt of all regulatory
         approvals, the person exercising the option may deliver in payment of a
         portion or all of the purchase price certificates for Common Stock,
         including a multiple series of exchanges of such Common Stock, which
         shall be valued at the Fair Market Value of such Common Stock on the
         date of exercise of the option. No options shall be exercisable except
         in respect of whole shares of Stock.

Section 2.5   Nontransferability of Options. An option granted under the Plan
shall, by its terms, be nontransferable by the Optionee other than by will or by
the laws of descent and distribution. During the Optionee's lifetime, the option
shall be exercisable only by the Optionee or by the Optionee's duly appointed
guardian or personal representative.

Section 2.6   Termination of Directorship.

         (a) If the directorship of the Optionee is terminated for any
         reason other than (i) Disability (as hereinafter defined) of the
         Optionee, (ii) death of the Optionee, or (iii) on account of any act of
         fraud or intentional misrepresentation or embezzlement,
         misappropriation or conversion of assets or opportunities of the
         Corporation or any Affiliate, or other cause, as determined by the
         Board, an option (to the extent otherwise exercisable on the date of
         such termination) shall

                                       5
<PAGE>   9

         be exercisable by the Optionee at any time prior to the Expiration Date
         of the option or within 90 days after the date of such termination of
         the directorship, whichever is the shorter period.

         (b)  If the Optionee's directorship is terminated by reason of
         Disability, an option (to the extent otherwise exercisable on the date
         of the Optionee's termination of directorship by reason of Disability)
         shall be exercisable by the Optionee at any time prior to the
         Expiration Date of the option or within twelve (12) months after the
         date of such termination, whichever is the shorter period. As used
         herein, the term "Disability" shall mean the inability to engage in any
         substantial gainful activity by reason of any medically determinable
         physical or mental impairment which can be expected to result in death
         or which has lasted or can be expected to last for a continuous period
         of not less than twelve (12) months. The determination of whether or
         not an Optionee's directorship is terminated by reason of Disability
         shall be in the sole and absolute discretion of the Committee. An
         individual shall not be considered Disabled unless he furnishes proof
         of the existence thereof in such form and manner, and at such times, as
         the Committee may require.

         (c)  If an Optionee dies while serving as a member of the Board,
         the option shall be exercisable (to the extent otherwise exercisable on
         the date of the death of such Optionee) by the person or persons
         entitled to do so under the Optionee's will, or, if the Optionee shall
         fail to make testamentary disposition of said option or shall die
         intestate, by the Optionee's legal representative or representatives,
         at any time prior to the Expiration Date of the option or within twelve
         (12) months after the date of death, whichever is the shorter period.

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<PAGE>   10
         (d)   The option of a Non-Employee Director shall automatically
         terminate as of the date his or her directorship is terminated, if the
         directorship is terminated on account of any act of (i) fraud or
         intentional misrepresentation; (ii) embezzlement, misappropriation or
         conversion of assets or opportunities of the Corporation or any
         Affiliate; or (iii) cause as otherwise determined by the Board.

Section 2.7   Issuance of Stock Certificates. Upon exercise of an option, but
subject to the provisions of Section 3.6 of the Plan, the person exercising the
option shall be entitled to one (1) stock certificate evidencing the shares
acquired upon such exercise; provided, however, that any person who tenders
Common Stock in payment of a portion or all of the purchase price of Stock
purchased upon exercise of the option shall be entitled to receive a separate
certificate representing the number of shares purchased in consideration of the
tender of such Common Stock.

                                  ARTICLE III

                                Other Provisions

Section 3.1   Adjustments Upon Changes in Capitalization.

         (a)  In the event that a dividend payable in shares of Common Stock
         or a stock split shall be hereinafter declared upon the Common Stock,
         the number of shares of Common Stock then subject to any option granted
         hereunder and the number of shares reserved for issuance pursuant to
         the Plan but not yet covered by an option shall be adjusted by adding
         to each such share the number of shares which would be distributable
         thereon if such share had been outstanding on the date

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<PAGE>   11

         fixed for determining the shareholders entitled to receive such stock
         dividend or stock split.

         (b)  In the event that the outstanding shares of the Common Stock
         shall be changed into or exchanged for a different number or kind of
         shares of stock or other securities of the Corporation or of another
         corporation, whether through reorganization, recapitalization, stock
         split, combination of shares, merger or consolidation, then there shall
         be substituted for each share of Common Stock subject to any such
         option and for each share of Common Stock reserved for issuance
         pursuant to the Plan but not yet covered by an option, the number and
         kind of shares of stock or other securities into which each outstanding
         share of Common Stock shall be so changed or for which each such share
         shall be exchanged.

         (c)  In the event that there shall be any change, other than as
         specified above in this Section 3.1, in the number or kind of
         outstanding shares of Common Stock or of any stock or other securities
         into which Common Stock shall have been changed or for which it shall
         have been exchanged, then if the Committee shall in its sole discretion
         determine that such change equitably requires an adjustment in the
         number or kind of shares theretofore reserved for issuance pursuant to
         the Plan but not yet covered by an option and of the shares then
         subject to an option or options, such adjustment shall be made by the
         Committee and shall be effective and binding for all purposes of the
         Plan and of each Option Agreement.

         (d)  In the case of any such substitution or adjustment as provided
         for in this Section, the option price in each Option Agreement for each
         share covered

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<PAGE>   12

         thereby prior to such substitution or adjustment will be the option
         price for all shares of stock or other securities which shall have been
         substituted for such share or to which such adjustment provided for in
         this Section 3.1 shall be made. No adjustment or substitution provided
         for in this Section 3.1 shall require the Corporation pursuant to any
         Option Agreement to sell a fractional share, and the total substitution
         or adjustment with respect to each Option Agreement shall be limited
         accordingly.

Section 3.2   Acceleration. In the event of a Change in Control, the provisions
of subsections (a) and (b) of this Section 3.2 shall apply to determine the
exercisability of options granted hereunder. A "Change in Control" for purposes
of this Plan shall mean the acquisition of fifty percent (50%) or more of the
Common Stock, issued and outstanding immediately prior thereto, pursuant to a
tender or exchange offer made by a person or group of related persons (other
than the Corporation or a person that directly or indirectly controls, is
controlled by or is under common control with the Corporation) which the Board
does not recommend to the shareholders, or one or more of the following
shareholder-approved transactions: (i) a merger or consolidation in which the
Corporation is not the surviving entity, provided securities possessing fifty
percent (50%) or more of the total combined voting power of the Corporation's
outstanding voting securities are transferred to a person or persons different
from those who held such securities immediately prior to such transaction; (ii)
the sale, transfer or other disposition of all or substantially all of the
assets of the Corporation other than in the ordinary course of business; or
(iii) any reverse merger in which the Corporation is the surviving entity but in
which securities possessing fifty percent (50%) or more of the total combined

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<PAGE>   13

voting power of the Corporation's outstanding voting securities are transferred
to a person or persons different from those who held such securities immediately
prior to such merger. In no event shall any merger, consolidation or other
reorganization involving the Corporation be deemed to constitute a "Change in
Control" if the primary purpose of such transaction is either to change the
state in which the Corporation is incorporated or to create a holding company
structure whereby the Corporation's shareholders of record become the
shareholders of the holding company.

         (a)  Change in Control with Provision Being Made Therefor. If
         provision be made in writing in connection with a Change in Control for
         the assumption and continuance of any option granted under the Plan, or
         the substitution for such option of a new option covering the shares of
         the successor corporation, with appropriate adjustment as to number and
         kind of shares and prices, the option granted under the Plan, or the
         new option substituted therefor, as the case may be, shall continue in
         the manner and under the terms provided.

         (b)  Change in Control Without Provision Being Made Therefor. If
         provision is not made in connection with a Change in Control for the
         continuance and assumption of the option granted under the Plan or for
         the substitution of any option covering the shares of the successor
         corporation, then the holder of any such option shall be entitled,
         prior to the effective date of any such Change in Control, to purchase
         the full number of shares not previously exercised under such option,
         without regard to the period of exercisability set forth in Section 2.4
         if (and only if) such option has not at that time expired or been
         cancelled, failing which purchase, any unexercised portion shall be
         deemed cancelled as of the effective date of such Change in Control.

                                       10
<PAGE>   14

         All adjustments under this Section 3.2 shall be made by the Committee,
whose determination as to what adjustments shall be made and the extent thereof,
shall be final, binding and conclusive for all purposes of the Plan and of each
Option Agreement.

Section 3.3   Continuation of Directorship. Nothing contained in this Plan (nor
in any option granted pursuant to this Plan) shall confer upon any Non-Employee
Director any right to continue as a member of the Board or constitute any
contract or agreement or interfere in any way with the right of the Corporation
to remove such Non-Employee Director from the Board. Nothing contained herein or
in any Option Agreement shall affect any other contractual rights of a
Non-Employee Director.

Section 3.4   Amendment and Termination. The Board may at any time suspend or
terminate the Plan and may, with the consent of the Optionee, make such
modifications of the terms and conditions of such Optionee's option as it shall
deem advisable. No option may be granted during any suspension of the Plan or
after such termination. The amendment, suspension or termination of the Plan
shall not, without the consent of the Optionee, alter or impair any rights or
obligations under any option theretofore granted under the Plan.

         The Board may at any time amend the Plan as it shall deem advisable
without further action on the part of the shareholders of the Corporation;
provided, that any amendment to the Plan must be approved by the shareholders of
the Corporation, if the amendment would (i) increase the aggregate number of
shares of Stock which may be issued pursuant to options granted under the Plan;
(ii) change the minimum option price; (iii) increase the maximum terms of
options provided for herein; (iv) materially modify the requirements as to
eligibility for participation in the Plan; (v) remove the administration

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<PAGE>   15

of the Plan from the Committee; or (vi) materially increase the benefits
accruing to holders of options under the Plan.

Section 3.5   Time of Exercise. An option shall be deemed to be exercised when
the Secretary of the Corporation receives written notice of such exercise from
the person entitled to exercise the option together with payment of the purchase
price made in accordance with Section 2.4 of this Plan.

Section 3.6   Privileges of Stock Ownership and Non-Distributive Intent. The
holder of an option shall not be entitled to the privileges of stock ownership
as to any shares of Stock not actually issued and delivered to the holder.

Section 3.7   Effective Date of the Plan. The Plan shall be effective upon
approval by the affirmative vote of the holders of a majority of the outstanding
shares of Common Stock present and entitled to vote at a meeting duly held or by
the written consent of the holders of a majority of the outstanding shares of
Common Stock entitled to vote.

Section 3.8   Expiration. Unless previously terminated by the Board, the Plan
shall expire at the close of business on the date which is the last day of the
ten (10) year period beginning on the earlier of the date on which the Plan is
adopted by the Board or the date on which the shareholders approve the Plan, and
no option shall be granted under it thereafter, but such expiration shall not
affect any option theretofore granted.

Section 3.9   Governing Law. The Plan and the options issued hereunder shall be
governed by, and construed and enforced in accordance with, the laws of the
State of Texas applicable to contracts made and performed within that State.

Section 3.10  Application of Funds. The proceeds received by the Corporation
from the sale of shares pursuant to options shall be used for general corporate
purposes.

                                       12
<PAGE>   16

Section 3.11  No Liability for Good Faith Determinations. Neither the members of
the Board nor the Committee shall be liable for any act, omission or
determination taken or made in good faith with respect to the Plan or any option
granted under it.

Section 3.12  Execution of Receipts and Releases. Any payment or any issuance
or transfer of shares of Stock to the Optionee, or to his legal representative,
heir, legatee or distributee, in accordance with the provisions hereof, shall,
to the extent thereof, be in full satisfaction of all claims of such persons
hereunder. The Board may require any Optionee, legal representative, heir,
legatee or distributee, as a condition precedent to such payment, to execute a
release and receipt therefor in such form as it shall determine.

Section 3.13  No Guarantee of Interests. Neither the Board nor the Corporation
guarantees the Stock from loss or depreciation.

Section 3.14  Payment of Expenses. All expenses incident to the administration,
termination or protection of the Plan, including, but not limited to, legal and
accounting fees, shall be paid by the Corporation.

Section 3.15  Corporate Records. Records of the Corporation and any Affiliate
regarding the Optionee's period of service, termination of service and the
reason therefor, leaves of absence, and other matters shall be conclusive for
all purposes hereunder, unless determined by the Committee to be incorrect.

Section 3.16  Information. The Corporation and any Affiliate shall, upon request
or as may be specifically required hereunder, furnish or cause to be furnished
all of the information or documentation which is necessary or required by the
Committee to perform its duties and functions under the Plan.

                                       13
<PAGE>   17

Section 3.17  No Liability of Corporation. The Corporation assumes no obligation
or responsibility to the Optionee or his or her personal representatives, heirs,
legatees or distributees for any act of, or failure to act on the part of, the
Board or the Committee.

Section 3.18  Corporate Action. Any action required of the Corporation shall be
by resolution of the Board or by a person authorized to act by Board resolution.

Section 3.19  Severability. If any provision of this Plan shall be held to be
illegal or invalid for any reason, the illegality or invalidity shall not affect
the remaining provisions hereof, but shall be fully severable and the Plan shall
be construed and enforced as if the illegal or invalid provision had never been
included herein.

Section 3.20  Notice. Whenever any notice is required or permitted hereunder,
such notice must be in writing and personally delivered or sent by mail. Except
as otherwise provided in Section 3.5 of this Plan, any notice required or
permitted to be delivered hereunder shall be deemed to be delivered on the date
on which it is personally delivered or, whether actually received or not, on the
third (3rd) business day after it is deposited in the United States mail,
certified or registered, postage pre-paid, addressed to the person who is to
receive it at the address which such person has theretofore specified by written
notice delivered in accordance herewith. The Corporation or an Optionee may
change, at any time and from time to time, by written notice to the other, the
address which it or he had theretofore specified for receiving notices. Until it
is changed in accordance herewith, the Corporation and each Optionee shall
specify as its and his address for receiving notices the address set forth in
the Option Agreement pertaining to the shares to which such notice relates.

                                       14
<PAGE>   18

Section 3.21  Waiver of Notices. Any person entitled to notice hereunder may
waive such notice.

Section 3.22  Successors. The Plan shall be binding upon the Optionee, his or
her heirs, legatees and legal representatives, and upon the Corporation and its
successors and assigns.

Section 3.23  Headings. The titles and headings of sections and paragraphs are
included for convenience of reference only and are not to be considered in
construction of the provisions hereof.

Section 3.24  Word Usage. Words used in the masculine shall apply to the
feminine where applicable and, wherever the context of this Plan dictates, the
plural shall be read as the singular and the singular as the plural.

                                       15

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