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                                 EXHIBIT 10.18

                                ERNEST H. MCKEE
                              GUARANTY AGREEMENT
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                              GUARANTY AGREEMENT
                              ------------------

KNOW ALL MEN BY THESE PRESENTS:

     In consideration of and as an inducement for STILLWATER NATIONAL BANK AND
TRUST COMPANY, STILLWATER, OKLAHOMA (hereinafter referred to as the "Lender"),
to loan and advance on this date to WESTWOOD CORPORATION, TANO CORP., NMP CORP.,
and MC II ELECTRIC COMPANY (hereinafter collectively referred to as the
"Debtor"), the principal sum of Two Million Eight Hundred Thousand and No/100
Dollars ($2,800,000.00) in the form of a 5-month Renewal and Amended Revolving
Promissory Note of even date herewith (the "Note"), the undersigned, ERNEST H.
MCKEE, (hereinafter referred to as the "Guarantor") does hereby agree with the
Lender as follows:

     1.  The undersigned Guarantor does hereby unconditionally and irrevocably,
jointly and severally, guarantee to the Lender, its successors and assigns:

         (a) The complete, faithful and punctual payment and performance of each
     of the covenants, agreements and obligations of the Debtor contained and
     set forth in the Note, receipt of a true and complete copy of the same is
     hereby acknowledged by Guarantor;

         (b) The complete, faithful and punctual performance of each covenant,
     agreement and obligation of the Debtor and any other party, contained and
     set forth in any instrument executed for the purpose of securing the
     payment of the Note ("the Security Instruments") of even date herewith
     made, executed, acknowledged and delivered to the Lender, receipt of true
     and complete copies of which Security Instruments is hereby acknowledged by
     Guarantor;

         (c) That the principal amount of the Note shall be paid upon maturity
     thereof, whether the same matures by acceleration or otherwise and, that in
     case of any extension of time for payment or renewal in whole or in part of
     the Note, all sums payable under the terms thereof shall be promptly paid
     when due according to such extension or extensions, renewal or renewals;
     and

         (d) This Guaranty is for the punctual payment, performance and
     discharge (whether upon acceleration or otherwise in accordance with the
     terms thereof) of all sums due under the Note or the Security Instruments
     (all such indebtedness is herein called the "Indebtedness"), together with
     any and all expenses of, for and incidental to collection, including
     reasonable attorneys' fees, as hereinabove described, and to no other
     obligations of Debtor to Lender.

     2.  The Lender may, at the option of the Lender, proceed to enforce this
Guaranty against the Guarantor (and any collateral securing performance of the
Guaranty owned by Guarantor) without first proceeding against the Debtor or any
other person liable for payment or performance under the Note or the Security
Instruments, and without first proceeding against or exhausting any collateral
now or hereafter held by the Lender to secure such payment or performance and
without

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setoff in respect to the value of any such collateral. Provided, however,
nothing contained herein will limit the Lender in exercising any rights under
the Note or the Security Instruments. Should Lender proceed against any
collateral, Guarantor will be entitled to a setoff as to the amount bid for the
collateral at any judicial sale. On the occurrence of any Event of Default under
the Note, the Security Instruments, or this Guaranty, the Lender will be
entitled to selectively and successively enforce any one or more of the rights
held by the Lender and such action will not be deemed a waiver of any other
right held by Lender. All of the remedies of Lender under the Note and the
Security Instruments are cumulative and not alternative.

     3.  Guarantor does hereby waive: notice of acceptance hereof; notice of the
extension of credit from time to time given by Lender to Debtor and the
creation, existence or acquisition of any indebtedness hereby guaranteed; notice
of the amount of indebtedness of Debtor to Lender from time to time subject,
however, to Guarantor's right to make inquiry of Lender to ascertain the amount
of indebtedness at any reasonable time; notice of adverse change in Debtor's
financial condition or of any other fact which might increase Guarantor's risk;
notice of presentment for payment, demand, protest and notice thereof as to any
instrument; notice of default; and all other notices and demands to which
Guarantor might otherwise be entitled. Guarantor agrees to be bound to the
payment of the Indebtedness of Debtor to Lender whether now existing or
hereafter accruing as fully as if such indebtedness was directly owing to Lender
by Guarantor. Until all of Indebtedness shall have been paid in full, Guarantor
shall have no right of subrogation, reimbursement or indemnity whatsoever and no
right of recourse to or with respect to any assets or property of the Debtor or
to any collateral for the Indebtedness of Debtor. If the Debtor or any Guarantor
should at any time become insolvent or make a general assignment, or if a
petition in bankruptcy or any insolvency or reorganization proceedings shall be
filed or commenced by, against or in respect of the Debtor or any Guarantor, any
and all of the obligations of the Guarantor shall forthwith become due and
payable without notice.

     4.  Guarantor consents and agrees that, without notice to or by Guarantor
and without affecting or impairing the obligations of Guarantor hereunder,
Lender may compromise or settle, extend the period of duration or the time for
the payment or discharge or performance of, or may refuse to enforce or may
release all or any parties to any and all of said Indebtedness, or may grant
other indulgences to the Debtor in respect thereof, or may amend or modify in
any manner any documents or agreements relating to such Indebtedness (other than
this Guaranty) or may release, surrender, exchange, modify, impair, or extend
the period of duration or time for the performance, discharge, or payment of,
any and all deposits and other property securing the Indebtedness or on which
Lender at any time may have a lien, or may refuse to enforce its rights, or may
make any compromise or settlement or agreement therefor, in respect of any and
all of such deposits and property, or with any party to the Indebtedness, or
with any other person, firm or corporation whatsoever, or may release or
substitute any one or more of the endorsers or guarantors of the Indebtedness
whether parties to this instrument or not, or may exchange, enforce, waive or
release any security for any guaranty of the Indebtedness.

     5.  Guarantor consents and agrees that Lender shall be under no obligation
to marshal any assets in favor of Guarantor or against Guarantor or in payment
of any or all of the Indebtedness.  Guarantor agrees to pay all expenses
incurred by Lender in connection with enforcement of its rights

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under this Guaranty, as well as court costs, collection charges and reasonable
attorneys' fees and disbursements. Guarantor further agrees that to the extent
Debtor makes payment or payments to Lender, which payment or payments or any
part thereof are subsequently invalidated, declared to be fraudulent or
preferential, set aside and/or required to be repaid to a trustee, receiver or
any other party under any bankruptcy act, state or federal law, common law or
equitable cause, then to the extent of such payment or repayment, the obligation
or part thereof intended to be satisfied shall be revived and continued in full
force and effect as if said payment had not been made.

     6.  Any and all present and future debts and obligations of the Debtor to
the Guarantor are hereby waived and postponed in favor of; and subordinated to
the full payment of Indebtedness by the Debtor to Lender.

     7.  Guarantor agrees that the liability of Guarantor under this Guaranty
shall be immediate and shall not be contingent upon the exercise or enforcement
by Lender of whatever remedies it may have against the Debtor or others, or the
enforcement of any lien or realization upon any security which Lender may at any
time possess.

     8.  In the event of the death of the Guarantor, this Guaranty shall
continue in effect against his estate.

     9.  Guarantor agrees that he will promptly execute and deliver to Lender
or its designee written reaffirmation of Guarantor's obligations hereunder if so
requested by Lender from time to time.  Guarantor's absolute obligation to make
such reaffirmations is not to be construed to infer an absence of liability on
Guarantor's behalf in any instance in which the Guarantor is not asked to
reaffirm (or fails to reaffirm) his obligations, notwithstanding any
modification of Debtor's obligations to Lender.

     10. The Guarantor agrees that all the rights, benefits and privileges
herein and hereby conferred upon Lender shall vest in, and be enforceable by
Lender, its successors and assigns.

     11. This Guaranty, all acts and transactions hereunder and the rights and
obligations of the parties hereto shall be governed, construed and interpreted
according to the laws of the State of Oklahoma. As part of the consideration of
Lender's granting credit to Debtor, Guarantor hereby agrees that all actions or
proceedings arising directly or indirectly hereunder may, at the option of
Lender, be litigated in courts having situs within the state named in the
previous sentence, and Guarantor hereby expressly consents to the jurisdiction
of any local, state or federal court located within said state, and consents
that any service of process in such action or proceeding may be made by personal
service upon Guarantor wherever Guarantor may be then located, or by certified
or registered mail directed to Guarantor at his last known address.

     12. Guarantor hereby acknowledges that he is entering into this Guaranty
to induce Lender to make a loan to Debtor in the amount of Two Million Eight
Hundred Thousand and No/100 Dollars ($2,800,000.00), to be used for the
operation of the businesses conducted by the Debtor.

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     13. Notwithstanding anything to the contrary contained herein, the
aggregate liability of Guarantor under this Agreement will not be greater than
Eight Hundred Thousand and No/100 Dollars ($800,000.00).

     IN WITNESS WHEREOF, Guarantor has hereunto subscribed his name this 25th
day of October, 2000.

                                  /s/ Ernest H. McKee
                                  -----------------------------------
                                  Ernest H. McKee

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                                                                     Exhibit 4.4

                              Second Amendment to
                         Registration Rights Agreement

     This Second Amendment ("Agreement") is made as of this 22nd day of
February, 2001, to the Registration Rights Agreement entered into on or about
March 30, 1995, by and among Panja Inc., a Texas corporation f/k/a AMX
Corporation (the "Company") and various other parties and which was amended on
September 12, 1995 (the "Registration Rights Agreement"). Capitalized terms used
herein and not otherwise defined shall have the meaning set forth in the
Registration Rights Agreement.

     WHEREAS, J. Joseph Hardt, Scott D. Miller and Peter D. York  (collectively,
the "Existing Shareholders") are the only parties to the Registration Rights
Agreement that still hold Registrable Shares;

     WHEREAS, Section 13(b) of the Registration Rights Agreement provides that
the  Agreement may be modified only by a writing signed by or on behalf of the
Company and by Holders of a majority in number of the Registrable Securities
then outstanding;

     WHEREAS, the Existing Shareholders own a majority in number of the
Registrable Securities outstanding on the date hereof;

     WHEREAS, it is proposed that the Company issue shares of its Common Stock,
par value $0.01 per share (the "Common Stock"), valued at up to $5,500,000 to
one or more purchasers pursuant to the provisions of one or more Stock Purchase
Agreements to be entered into between the Company and such purchasers (the
"Purchase Agreements");

     WHEREAS, Scott D. Miller has requested and the Company has agreed to grant
Mr. Miller registration rights that may conflict with those of the Existing
Shareholders pursuant to a Registration Rights Agreement made of even date
herewith between Mr. Miller and the Company (the "New Registration Rights");

     WHEREAS, the Existing Shareholders desire to amend the Registration Rights
Agreement so that the registration rights granted thereunder will not conflict
with the New Registration Rights and the Company agrees to such amendment.

     NOW THEREFORE, in consideration of the foregoing promises and the
agreements set forth below, the parties hereto agree as follows:

     1.   Section 1 of the Registration Rights Agreement shall be amended to
include the following definitions:

          "Existing Shareholders" means J. Joseph Hardt, Scott D. Miller and
     Peter D. York.

          "Intel" means Intel Corporation, a Delaware corporation.
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            "Intel Agreement" means the Securities Purchase and Investor Rights
     Agreement between Intel and the Company dated as of December 15, 1999.

            "Person" or "persons" means any individual, corporation,
     partnership, limited liability company, joint venture, association, joint-
     stock company, trust, unincorporated organization or other entity or
     government or other agency or political subdivision thereof.

            "SEC" means the Securities and Exchange Commission.

            "Selling Holder" means any Holder who is selling Registrable
     Securities pursuant to a public offering registered hereunder.

            "Underwriter" means a securities dealer who purchases any
     Registrable Securities as principal and not as part of such dealer's
     market-making activities.

     2.     Section 3 of the Registration Rights Agreement, including
subparagraphs (a) and (b) and any subsections thereof, shall be deleted in its
entirety and replaced with the following:

        "3. Piggyback Registrations.
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        (a) After the date hereof, if the Company proposes to file a
     registration statement under the Act with respect to an offering of Common
     Stock for its own account or for the account of another Person (other than
     a registration statement on Form S-4 or S-8 (or any substitute form or
     rule, respectively, that may be adopted by the SEC)), the Company shall
     give written notice of such proposed filing to the Holders at the address
     set forth in the share register of the Company as soon as reasonably
     practicable (but in no event less than 15 days before the anticipated
     filing date), undertaking to provide each Holder the opportunity to
     register on the same terms and conditions such number of shares of
     Registrable Securities as such Holder may request (a "Piggyback
     Registration"). Each Holder will have seven business days after receipt of
     any such notice to notify the Company as to whether it wishes to
     participate in a Piggyback Registration (which notice shall not be deemed
     to be a requested registration under Section 2); provided that should a
     Holder fail to provide timely notice to the Company, such Holder will
     forfeit any rights to participate in the Piggyback Registration with
     respect to such proposed offering. If the Company or the Person for whose
     account such offering is being made shall determine in its sole discretion
     not to register or to delay the proposed offering, the Company may, at its
     election, provide written notice of such determination to the Holders and
     (i) in the case of a determination not to effect the proposed offering,
     shall thereupon be relieved of the obligation to register such Registrable
     Securities in connection therewith, and (ii) in the case of a determination
     to delay a proposed offering, shall thereupon be permitted to delay
     registering such Registrable Securities for the same period as the delay in
     respect of the proposed offering. As between the Company or any other
     Person for whose account any such offering is being made, on one hand, and
     the Selling Holders, on the other hand, the Company or such other Person,
     as

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     the case may be, shall be entitled to select the Underwriters in connection
     with any Piggyback Registration.

        (b) If the Registrable Securities requested to be included in the
     Piggyback Registration by any Holder differ from the type of securities
     proposed to be registered by the Company and the managing Underwriter
     advises the Company that due to such differences the inclusion of such
     Registrable Securities would materially and adversely affect the price of
     the offering (a "Material Adverse Effect"), then (i) the number of such
     Holders' Registrable Securities to be included in the Piggyback
     Registration shall be reduced to an amount which, in the opinion of the
     managing Underwriter, would eliminate such Material Adverse Effect or (ii)
     if no such reduction would, in the opinion of the managing Underwriter,
     eliminate such Material Adverse Effect, then the Company shall have the
     right to exclude all such Registrable Securities from such Piggyback
     Registration, provided that no other securities of such type are included
     and offered for the account of any other Person in such Piggyback
     Registration. Any partial reduction in number of Registrable Securities of
     any Holder to be included in the Piggyback Registration pursuant to clause
     (i) of the immediately preceding sentence shall be effected pro rata based
     on the ratio which such Holder's requested shares bears to the total number
     of shares requested to be included in such Piggyback Registration by all
     Persons other than the Company who have the contractual right to request
     that their shares be included in such registration statement and who have
     requested that their shares be included. If the Registrable Securities
     requested to be included in the registration statement are of the same type
     as the securities being registered by the Company (whether such
     registration is initiated by the Company or another security holder) and
     the managing Underwriter advises the Company that the inclusion of such
     Registrable Securities would cause a Material Adverse Effect, the Company
     will be obligated to include in such registration statement, as to each
     Holder and any other Person or Persons having a contractual right to
     request their shares be included in such registration only a portion of the
     shares such Holder and such other Person or Persons have requested be
     registered equal to the ratio which each such Holder's and such other
     Person's requested shares bears to the total number of shares requested to
     be included in such registration statement by all Holders and such other
     Person or Persons (other than the Person or Persons initiating such
     registration request) having a contractual right to request that their
     shares be included in such registration statement and who have requested
     their shares be included. If the Company initiated the registration, then
     the Company may include all of its securities in such registration
     statement before any such Holder's requested shares are included. If
     another security holder initiated the registration, then such initiating
     security holder may include all of its securities in such registration
     statement before any such Holder's requested shares are included and the
     Company may not include any of its securities in such registration
     statement unless all Registrable Securities requested to be included in the
     registration statement by all Holders are included in such registration
     statement. If as a result of the provisions of this Section 3(b) any Holder
     shall not be entitled to include all Registrable Securities in a
     registration that such Holder has requested to be so included, such Holder
     may withdraw such

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     Holder's request to include Registrable Securities in such registration
     statement prior to its effectiveness. Notwithstanding the foregoing, the
     Holders acknowledge that their rights under this Section 3 are subordinate
     to the rights of Intel pursuant to Section 7(b)(iii) of the Intel
     Agreement. "

     3.     Section 6 of the Registration Rights Agreement shall be amended to
include the following subparagraph (h):

            "(h) The rights of the Existing Shareholders to register securities
that are set forth in Sections 2, 3 and 5 of this Agreement shall expire on
February 28, 2003."

     4.     The Existing Shareholders constitute, collectively, the holders of
at least a majority of the Registrable Securities outstanding.

     5.     Except as expressly amended herein, the terms of the Registration
Rights Agreement shall remain in full force and effect.

     6.     Effective as of the Closing (as defined in the Purchase Agreements),
Scott D. Miller has waived any and all rights that he has under the Registration
Rights Agreement.

     7.     In the event that any of the registration rights granted pursuant to
the Registration Rights Agreement are later found to be in conflict with the New
Registration Rights or the registration rights set forth in the Intel Agreement,
the Existing Shareholders agree to execute, acknowledge and deliver to the
Company such other amendments or agreements as the Company may request and do
and cause to be done all acts or things as the Company may request and as may be
required in order to avoid such conflict with the New Registration Rights or the
registration rights set forth in the Intel Agreement; provided, however, any pro
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rata cutback of shares provided in Section 3 of the Registration Rights
Agreement shall not be deemed to be a conflict.

     8.     This Agreement may be executed in multiple counterparts, each of
which shall be deemed an original for all purposes, and all of which together
shall constitute one and the same instrument. Each such multiple counterpart of
this Agreement may be transmitted via facsimile or other similar electronic
means and executed by one or more of the undersigned, and a facsimile of the
signature of one or more of the undersigned shall be deemed an original
signature for all purposes and have the same force and effect as a manually
signed original. In addition, notwithstanding nothing to the contrary contained
herein, this Agreement shall become effective and binding upon each signatory
hereto at the time counterpart signature pages have been executed by such
signatory and the failure of one or more other signatories to sign this
Agreement shall not affect its effectiveness.

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     IN WITNESS WHEREOF, the Company and the Existing Shareholders have executed
this Agreement as of the date first written above.

                              PANJA INC.

                              By: /s/ Joe Hardt
                                 ----------------------------
                              Name: Joe Hardt
                                   --------------------------
                              Title: President
                                    -------------------------

                              /s/ J. Joseph Hardt
                              -------------------------------
                              J. Joseph Hardt

                              /s/ Scott D. Miller
                              -------------------------------
                              Scott D. Miller

                              /s/ Peter D. York
                              -------------------------------
                              Peter D. York

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