Document:

<PAGE>

                                                                  EXHIBIT 10.22

                                   Agreement

         THIS AGREEMENT is made and entered into as of this 18th day of March,
1992, by and between ROBERT WILSON ("Mr. Wilson") and RADIO METRIX INC.
("RMI").

                                  WITNESSETH:

         WHEREAS, Arvin Brent Simon has developed technology for a sensing
device utilizing radio waves in a unique fashion (herein the "TECHNOLOGY"); and

         WHEREAS, Arvin Brent Simon, together with David Jones, Scott
Morneweck, Roger Keith and Thomas Cudnik (herein "RMC") have assigned all
rights to said TECHNOLOGY to SDR Metro, Inc., a corporation organized by them to
develop the TECHNOLOGY; and

         WHEREAS, SDR Metro, Inc. has entered into an exclusive, worldwide,
perpetual License Agreement with RMI concerning all applications of the
TECHNOLOGY; and

         WHEREAS, Mr. Wilson previously entered into an agreement with RMC, an
unincorporated entity doing business for the benefit of David Jones, Scott
Morneweck, Roger Keith, Thomas Cudnik, and Arvin Brent Simon (herein
collectively referred to as "RMC"), providing Mr. Wilson with certain marketing
rights, as specified in Exhibit "A" hereto; and

         WHEREAS, Exhibit "A" and the marketing rights granted to Mr. Wilson
thereunder were subsequently terminated by RMC pursuant to Exhibit "B"; and

         WHEREAS, Mr. Wilson attempted to assign part or all of his rights
under Exhibit "A" to Magnetic Maulburg, a German corporation, pursuant to
Exhibit "C"; and

         WHEREAS, Mr. Wilson introduced RMI, or its principals, Mr. Stephen
Michael and Mr. Samuel Duffey, to RMC for the purposes of attempting to
establish a commercialization agreement concerning the TECHNOLOGY; and

         WHEREAS, RMI had previously invited Mr. Wilson to be a participant and
stockholder of RMI as compensation for Mr. Wilson's introduction and
anticipated ongoing efforts to participate in the commercialization of the
TECHNOLOGY; and

         WHEREAS, RMI has withdrawn its invitation to Mr. Wilson to serve as a
participant or stockholder in RMI upon learning the correct facts and
circumstances surrounding Mr. Wilson's business and contractual relationships
with both RMC and Magnetic Maulburg; and

<PAGE>
         WHEREAS, RMI wishes to grant Mr. Wilson a royalty interest in future
potential revenues of RMI resulting solely from the TECHNOLOGY as sole and
exclusive compensation to Mr. Wilson for his introduction of RMI to RMC and any
prior or future assistance which he may provide in the commercialization of
TECHNOLOGY; and

         WHEREAS, RMI and Mr. Wilson wish to enter into this Agreement as the
definitive and exclusive statement of their understanding and agreement.

         NOW, THEREFORE, for good and valuable consideration, in hand received,
the parties hereto mutually agree as follows:

         1.       Compensation. RMI hereby agrees to pay to Mr. Wilson as Mr.
Wilson's sole and exclusive compensation from RMI and its stockholders and
principals an amount equal to five percent (5%) of the royalty revenue received
by RMI from the TECHNOLOGY, less any amounts paid or required to be paid to RMC
or SDR Metro, Inc. for the licensing rights to said TECHNOLOGY. In the event
RMI becomes the manufacturer or marketer of products incorporating the
TECHNOLOGY, RMI shall, in lieu of the foregoing compensation, pay Mr. Wilson
compensation equal to five percent (5%) of the adjusted gross revenues of RMI
from such sales, which involve the manufacture or marketing of products by RMI.
"Adjusted Gross Revenue" shall mean gross revenues from the sale of products
manufactured or marketed by RMI and incorporating the TECHNOLOGY, less all
costs of manufacturing, licensing, fees and royalties, manufacturing,
advertising, and cost of sales. The compensation provided for herein shall
continue for the life of the license arrangement between RMI and SDR Metro,
Inc. concerning the TECHNOLOGY. The Compensation provided for in this Agreement
is related solely and exclusively to the TECHNOLOGY described in the Agreement
dated March 14, 1992 between RMI and SDR Metro, Inc. In the event of revenues
earned by RMI for development purposes or for signing license arrangements, but
which do not constitute advance royalty fees, no compensation shall be paid to
Mr. Wilson hereunder. Should RMI receive compensation from the sale of the
TECHNOLOGY or a license fee that does not require ongoing royalty fees, RMI
shall pay Mr. Wilson an amount equal to 5% of RMI's net proceeds. For purposes
hereof, "net proceeds" shall mean gross proceeds less costs of procuring and
closing the sale or license, and royalty or other fees to be paid to SDR Metro,
Inc.

         2.       Buy-Out. Mr. Wilson agrees that the compensation arrangement
may be purchased by RMI or its assigns at any time for an aggregate purchase
price not to exceed $200,000, with all royalties earned during the first 24
months of this Agreement, constituting being credited against the purchase
price.

         3.       No Claim. Mr. Wilson expressly acknowledges and agrees that
he has no right, claim, or interest in or to the TECHNOLOGY. Furthermore, Mr.
Wilson acknowledges and agrees that he has no right, title, or interest in or
to, or any claim against, RMI or

                                       2
<PAGE>
any of its principals, save and except only his right to compensation as set
forth in paragraph 1 of this Agreement. Mr. Wilson acknowledges and agrees that
the Marketing Agreement designated Exhibit "A" hereto is void and of no
continuing effect and that he has no marketing rights or other interest in or
to the TECHNOLOGY arising thereunder. Simultaneously with the execution of this
Agreement, Mr. Wilson agrees to execute the General Release attached hereto as
Exhibit "D".

         4.       Proper Conduct. Mr. Wilson acknowledges and agrees that the
conduct of Duffey & Davis, P.A., and Attorney Samuel S. Duffey have been
appropriate and ethical at all times in connection with this transaction. Mr.
Wilson acknowledges that the purpose of this paragraph is to verify and confirm
that this Agreement is viewed by Mr. Wilson as consistent with the legal
responsibility of Duffey & Davis, P.A., and Mr. Duffey and does not in any
fashion constitute a conflict of interest or conduct which is viewed by Mr.
Wilson as unethical. Mr. Wilson acknowledges that he has been advised to
consult with and rely upon the advice of independent legal counsel and,
further, Mr. Wilson acknowledges and agrees that he has not relied upon the
advice of Mr. Duffey or Duffey & Davis, P.A., concerning this Agreement or
matters relating to RMC, RMI, or the TECHNOLOGY. Mr. Wilson acknowledges that,
while he consulted with Mr. Duffey concerning RMC and the TECHNOLOGY, his
marketing agreement was subsequently terminated by RMC, and he subsequently
requested of his own volition and with no suggestion from Mr. Duffey that Mr.
Duffey and Mr. Michael take over the project of attempting to commercialize the
TECHNOLOGY for their own interests and not in an attorney/client or other
confidential relationship with Mr. Wilson. Mr. Wilson acknowledges and agrees
that should any contention that Mr. Duffey or Duffey & Davis, P.A., acted other
than in a proper, correct, and ethical manner be made in the future by Mr.
Wilson, such contention would be for the sole purpose and intent of slandering
or adversely affecting the reputation of Mr. Duffey and would be actionable as
an intentional wrongdoing on the part of Mr. Wilson. Mr. Wilson acknowledges
and agrees that this paragraph 4 is a material inducement for RMI to enter into
this Agreement.

         5.       Confidentiality. Mr. Wilson acknowledges and agrees that any
and all information that he holds concerning the TECHNOLOGY is confidential and
cannot be disclosed by him to any third party without the prior permission or
approval of RMI. In furtherance of this confidentiality provision and not in
limitation thereof, Mr. Wilson shall execute, simultaneously with the execution
of this Agreement, the Confidentiality Agreement attached hereto as Exhibit
"E".

         6.       Covenant Not to Compete. Mr. Wilson agrees that during the
term of this Agreement and for a period of five years thereafter, he shall not,
either directly or indirectly, engage in any activity which is competitive with
the TECHNOLOGY licensed by

                                       3
<PAGE>
RMI from SDR Metro, Inc. For purposes hereof, activities competitive with the
TECHNOLOGY shall include, but not be limited to, any development, design,
marketing, commercialization, or manufacture of any product or any technology
which has a use or function similar to that served by the TECHNOLOGY, or which
may be served by the TECHNOLOGY during the term of this Agreement ("Competitive
Activity"). Indirectly engaging in any Competitive Activity shall include, but
not be limited to, serving as an officer, director, owner, partner,
shareholder, or agent or employee of any entity engaged in any Competitive
Activity.

         7.       Beneficial Party. Each of the agreements, covenants, and
representations of Mr. Wilson contained in this Agreement or any exhibit hereto
shall inure to the benefit of and shall be enforceable by SDR Metro, Inc., as
well as RMI and its principals.

         8.       Miscellaneous. This Agreement constitutes the entire
understanding of the parties and shall not be amended or otherwise altered,
except in writing and executed by the parties hereto. This Agreement shall be
governed by and construed in accordance with the laws of the state of Florida.
This Agreement shall not be construed more stringently against any party,
regardless of who may have been the draftsman. Any dispute arising under this
Agreement or any of the exhibits attached to this Agreement shall be resolved
by binding arbitration before the American Arbitration Association. Arbitration
shall be the sole and exclusive method for resolving any dispute or enforcing
this Agreement, and arbitration shall be seated solely in Sarasota, Florida,
and shall be before the American Arbitration Association. The findings of
arbitrators shall be final and binding and may be reduced to a judgment in any
court of competent jurisdiction.

         IN WITNESS WHEREOF, the parties hereto set their hands and seals on
the day and year first above written.

                                    MR. WILSON

                                    By: /s/ Robert Wilson
                                       ----------------------------------------
                                       ROBERT WILSON

                                    RMI
                                    Radio Metrix Inc.

                                    By: /s/ Stephen Michael, Pres.
                                       ----------------------------------------
                                       STEPHEN MICHAEL, President

                                       4
<PAGE>
                                  EXHIBIT "A"
                                   AGREEMENT

         THIS AGREEMENT made entered into at Cleveland, Ohio on this 24th day
of August, 1991 by and between Robert A. Wilson (herein called "Wilson") and
Radio Metrix Company in Euclid, Ohio, (herein called (RMC)) witnesseth:

         WHEREAS by cooperative effort of the parties a working prototype has
been produced, and

         WHEREAS initial marketing surveys have been conducted by Wilson, and

         WHEREAS Simon has assigned the patent and his responsibilities to a
new Corporation known as RMC and RMC together with Simon shall exclusively
manufacture and perform research and development as necessary to the product,
and

         WHEREAS all commercialization of the product will be conducted by
Wilson, and

         WHEREAS the parties wish to reduce to writing their agreement;

         NOW, THEREFORE in consideration of the mutual covenants hereinafter
set forth it is hereby agreed between the parties as follows:

                            ARTICLE I - DEFINITIONS

         As used herein the words capitalized in this article shall have the
meaning or identity set forth after each word.

A.       AGREEMENT: This Agreement

B.       RMS: Radio-metric proximity sensor using state-of-the-art electronics
to produce a signal to reverse or simply halt movement of a given product to
effectively prevent contact.

C.       CORPORATION: A new Corporation to manufacture and market RMS products.

D.       PRODUCT: The product shall consist of the RMS used specifically with
barrier gates, sliding gates, garage doors and all other forms of vehicle or
pedestrian access control using safety edge protection.

E.       MARKET: All industries involved with the application of the product
within the entire territories of Canada, U.S., Europe, Australia.

<PAGE>

         RMC hereby gives assignment to Wilson for exclusive sales and
marketing of the product and agrees that no other assignment shall be given
except where Wilson and RMC agree to offer a licensed agreement to include
compensation paid to both parties.

                              ARTICLE II - DUTIES

A.       Wilson shall perform in the following duties for the Corporation.

         a.       Wilson shall be responsible for sales and marketing of all
products relating to RMS. These duties will include the usual activities
performed by a marketing department in promotion, selling and distribution of
the products to any and all markets identified by Wilson or others.

         b.       Wilson shall arrange financing for the Corporation. Financing
shall cover such items as organizational costs, research and development,
production and marketing of all products.

B.       Simon shall perform in the following duties for the Corporation.

         a.       Simon will manage the development of prototypes of RMS
products as needed.

         b.       Simon shall be responsible for all manufacturing including
quality assurance and control.

                           ARTICLE III - COMPENSATION

         A.       Wilson shall be compensated by receiving the difference
between the agreed upon costs to Wilson and his selling price (margin). The
term "costs" shall also include the net profits of the Corporation (RMC).
Wilson shall receive the compensation amount presented in the Marketing Expense
as outlined in the business plan (Exhibit #l) until such time as his margin is
equal to the Marketing Expense, reviewed quarterly. At such time when
compensation is attained then the amount paid as Marketing Expense ceases, and
commission only will be paid thereafter. When a license agreement or buy-out of
the product type occurs, Wilson will receive 25% of royalty and buy-out amount
as compensation.

                       ARTICLE IV - SALE OR LICENSING RMS

         Should the Corporation decide to license or sell the RMS either in its
entirety or to individual companies for specific uses, Wilson shall be
compensated by receiving 25% of the sale price (if sold) and 25% of the
royalties paid to the Corporation by the RMS licensing organization(s). Any
payments due Wilson under royalties received from licensing the product shall
continue during Wilson's life and upon his death a computation of business on
the books will be paid to his estate and heirs, and no future claims against
RMC shall be paid or due.

<PAGE>

                     ARTICLE V - PERSONAL SERVICE CONTRACT

         This Agreement is one for personal service on behalf of Wilson,
therefore, it cannot be assigned by Wilson without the prior written consent of
RMC.

                           ARTICLE VI - USE OF TERMS

         Wherever a singular word is used in this Agreement, it shall be
considered as meaning the plural where applicable and wherever the context
permits or requires, and when the singular and/or neuter pronouns are used
herein, the same shall be construed as including all persons and Corporations
designated respectively as Principal or Representative in the heading of this
instrument wherever the context requires.

                          ARTICLE VII - APPLICABLE LAW

         This Agreement shall be construed and interpreted under and in
accordance with the laws of the State of Ohio.

                       ARTICLE VIII - LEGAL CONSTRUCTION

         In case any one or more of the provisions contained in this Agreement
shall be held for any reason to be invalid, illegal or unenforceable in any
respect, such invalidity, illegality or unenforceability shall not affect any
other provisions hereof and this Agreement shall be construed as if said
invalid, illegal or unenforceable provisions has never been contained herein.

                    ARTICLE IX - PRIOR AGREEMENTS SUPERSEDED

         This Agreement contains the entire understanding and contract between
the parties and all other prior written or oral agreements, understandings or
arrangements are hereby revoked.

                       ARTICLES X - BENEFIT OF AGREEMENT

         This agreement shall be binding upon and inure to the benefit of the
parties hereto, their respective heirs, personal representatives, successors
and assigns.

                           ARTICLE XI - MODIFICATION

         No amendment or modification of this agreement shall be binding upon
Wilson and/or RMC unless in writing and signed and dated by the party to be
charged herewith.

<PAGE>

                           ARTICLE XII - COUNTERPARTS

         This Agreement may be executed in counterparts and when properly
executed each counterpart shall be considered an original.

                   ARTICLE XIII - NON-PERFORMANCE/TERMINATION

         This agreement will be considered null and void if:

                  1.       If RMC fails to perform the designs outlined in the
                           business plan within a reasonable benchmark for
                           their completion.

                  2.       If Wilson fails to perform reasonable marketing
                           expectations outlined in the business plan.

         IN WITNESS WHEREOF the parties have hereunto set their hands this day
of August 24th, 1991.

                                    By: /s/ David Jones, President, RMC
                                       ----------------------------------------
                                    David Jones, President, RMC

                                    /s/ A. Brent Simon, Director of Design, RMC
                                    -------------------------------------------
                                    A. Brent Simon, Director of Design, RMC

                                    /s/ Robert A. Wilson
                                    -------------------------------------------
                                    Robert A. Wilson, Marketing Director

<PAGE>

                                  EXHIBIT "B"
                       [RADIO METRIX COMPANY LETTERHEAD]
-------------------------------------------------------------------------------

                                                               November 8, 1991

Mr. Robert A. Wilson
1516 Orange Ave. South
Sarasota, FL. 34237

Dear Mr. Wilson:

Since, you have ceased all communications with us, and refuse to to return our
phone messages we assume the following:

         1.       You are unable to secure financing to our August 1991
                  Business Plan.

         2.       You are no longer interested in fulfilling your obligations
                  under our agreement entered into on August 24th, 1991 by and
                  between Robert A. Wilson and RADIO METRIX COMPANY (RMC).

RMC sees no alternative but to terminate its agreement with you, due to lack of
funds, within seven (7) days from the writing of this letter. Termination of
our agreement is based on your non-performance of duties (Article II) paragraph
(A) subparagraph (b) "Wilson shall arrange financing for the Corporation.....".
Our agreement will be considered null and void under (Article XIII Item 2) "If
Wilson fails to perform reasonable marketing expectations outlined in the
business plan".

If you take exception to this letter please make your intentions known by
registered mail.

Sincerely,

RADIO METRIX COMPANY

By: /s/ David Jones, President, RMC
David Jones
President, RMC

By: /s/ A. Brent Simon, Director of Design, RMC
Arvin Brent Simon
Director of Design, RMC

DJ/ABS/sm

<PAGE>

[USPS LOGO]       CERTIFIED MAIL RECEIPT
                  No Insurance Coverage Provided
                  Do not use for International Mail
                  (See Reverse)

Sent to
MR. ROBERT A. WILSON

Street & No.
1516 ORANGE AVE. SOUTH

P.O. State & ZIP Code
SARASOTA FL 34237

Postage
                           $ 29

Certified Fee
                            100

Special Delivery Fee

Restricted Delivery Fee

Return Receipt Showing
To Whom & Date Delivered    100

Return Receipt Showing to
Whom, Date & Addressee's
Address

TOTAL Postage & Fees       $229

Postmark or Date
Nov. 8, 1991

<PAGE>
                                  EXHIBIT "C"
                                   AGREEMENT

This Agreement entered into this 11th day of October, 1991 by and between

                  Robert A. Wilson
                  1516 South Orange Ave.
                  Sarasota, FL 34239

and               MAGNETIC ELEKTROMOTOREN GMBH
                  Hauptatrasse 6
                  D7864 Maulburg/Germany

1)       Robert A. Wilson agrees to release the worldwide exclusive marketing
         rights of the Radio Metric Sensor (RMS) to the Magnetic Group of
         Companies for all applications in barrier gate sensing including toll
         booth gates and window/light dome sensing.

2)       Robert A. Wilson agrees to release the non-exclusive marketing rights
         for all applications of the RMS in combination with Magnetic actuators
         (i.e. linear actuators, swing - and sliding gates, swing door
         actuators etc.)

3)       The marketing rights do not include the application of overhead
         garage doors within the U.S.

4)       Robert A. Wilson will not demand from Magnetic any kind of
         compensation for these marketing rights.

5)       Magnetic will evaluate a proposal being presented by Radio Metrix
         Company (RMC) for the development and production of the RMS adapted to
         the appropriate application. Refusal of the use of RMS will void all
         rights as stated above.

                                             MAGNETIC ELEKTROMOTOREN GMBH

/s/ Robert A. Wilson                         /s/ A. Weiss       /s/ G. Hafner
--------------------------                   ----------------------------------
   (Robert A. Wilson)                           (A. Weiss)         (G. Hafner)

<PAGE>

GENERAL RELEASE                                                   RAMCO FORM 22

                        Know All Men By These Presents:

That I
    (I, We)

                  ROBERT WILSON

first party, for and in consideration of the sum of        $10.00
        Dollars, or other valuable considerations, received from or on behalf of

        Radio Metrix Inc., Radio Metrix Company, Genius Products, Inc.,
        SDR Metro, Inc., Samuel S. Duffey, Duffey & Davis, P.A. and
        Stephen Michael.

second party, the receipt whereof is hereby acknowledged,

        (Wherever used herein the terms "first party" and "second party" shall
include singular and plural, heirs, legal representatives, and assigns of
individuals, and the successors and assigns of corporations, wherever the
context so admits or requires.)

        HEREBY remise, release, acquit, satisfy, and forever discharge the said
second party, of and from all, and all manner of action and actions, cause and
causes of action, suits, debts, dues, sums of money, accounts, reckonings,
bonds, bills, specialties, covenants, contracts, controversies, agreements,
promises, variances, trespasses, damages, judgments, executions, claims and
demands whatsoever, in law or in equity, which said first party ever had, now
has, or which any personal representative, successor, heir or assign of said
first party, hereafter can, shall or may have against said second party, for,
upon or by reason of any matter, cause or thing whatsoever, from the beginning
of the world to the day of these presents.

        In Witness Whereof, I have hereunto set my hand and seal this 18th day
of March, A.D., 1992

Signed, sealed and delivered in presence of:

/s/                                          /s/ Robert Wilson             L.S.
------------------------------               -----------------------------
                                             ROBERT WILSON
/s/ Cathy                                                                  L.S.
------------------------------               -----------------------------

STATE OF FLORIDA,
COUNTY OF SARASOTA

                          I HEREBY CERTIFY that on this day, before me, an
officer duly authorized in the State aforesaid and in the County aforesaid to
take acknowledgments, personally appeared ROBERT WILSON to me known to be the
person described in and who executed the foregoing instrument and who
acknowledged before me that he executed the same.

        WITNESS my hand and official seal in the County and State last
aforesaid this 18th day of March A.D. 1992.

                                             /s/ Cathy ???
                                             ----------------------------------

This Instrument prepared by:                 NOTARY PUBLIC, STATE OF FLORIDA,
Samuel S. Duffey                             MY COMMISSION EXPIRIES:
                                             Nov. 1, 1995.
Address: Duffey & Davis, P.A.                BONDED THRU NOTARY PUBLIC
         1515 Ringling Blvd., Suite 800      UNDERWRITERS.
         Sarasota, FL 34236

<PAGE>

                            NON-DISCLOSURE AGREEMENT

Name:                           ROBERT A. WILSON
                    ----------------------------------------

Title:
                    ----------------------------------------

Address:                       1516 SO. ORANGE AVE.
                    ----------------------------------------

City/state:                       SARASOTA, FL
                    ----------------------------------------

Zip:                                  34239
                    ----------------------------------------

This will confirm the Agreement under which I will disclose to you information
and ideas that are considered confidential company information of SDR METRO,
INC. and RADIO METRIX INC.

It is understood that you will receive this disclosure in confidence and that
you will not use the information disclosed or disclose it to any third parties
or make any use of company information and ideas without prior written consent
from SDR METRO, INC. and RADIO METRIX INC.

The foregoing obligations shall not apply:

1.       To information which is or becomes publicly known other than by your
         failure to observe the above confidentiality obligations;

2.       To information which you subsequently receive from a third party who
         is not under similar confidentiality obligations to SDR METRO, INC.
         and RADIO METRIX INC. with respect to this information;

3.       To information which was already in your possession prior to this
         disclosure as proven by your records; and

4.       After five years from the date of this Agreement.

Please indicate your acceptance of the terms of this Agreement by signing a
copy of this Agreement and returning it to SDR METRO, INC. and RADIO METRIX
INC.

ACCEPTED BY:     /s/ Robert Wilson                   3-18-92
                ------------------------------------------------
                      Signature                        Date

APPROVED BY:     /s/ Stephen A. Michael              3-18-92
                ------------------------------------------------
                      Signature                        Date

<PAGE>

                               RADIO METRIX, INC.

TELEPHONE                                                             FAX
(941) 355-9361                                                   (941) 355-9373

                            4400 INDEPENDENCE COURT
                               SARASOTA, FL 34234

September 17, 1999

Mr. Robert Wilson
1516 South Orange Avenue
Sarasota, FL 34239

Dear Mr. Wilson:

         For almost seven years, Radio Metrix, Inc. has neither received
contact from you nor been advised by you with regard to contact information or
your current location. Both Sam and I are disappointed that you have elected to
abandon Radio Metrix, Inc. and your responsibilities under the Agreement. Your
decision to make yourself unavailable on a long-term basis and to provide no
assistance or support to Radio Metrix, Inc., as required under the Agreement,
constitutes a material breach of the Agreement entered into on March 18, 1992
between you and Radio Metrix, Inc. The purpose of this correspondence is to
exercise one last effort to provide you with formal notice that Radio Metrix,
Inc. considers the Agreement with you to be terminated by virtue of your
breach. You are further notified that Radio Metrix, Inc. intends to have no
ongoing or continuing relationship with you. In the event that you disagree
with the Company's position, we invite you to participate in an arbitration
proceeding in Sarasota, Florida as designated in the Agreement.

Very truly yours,
RADIO METRIX, INC.

/s/ Stephen A. Michael, President
------------------------------------------
Stephen A. Michael, President

SAM/nal

<PAGE>

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Do not use for International Mail (See reverse)

Sent to
Robert Wilson

Street & Number

Post Office, State & ZIP Code
34239

Postage                    $ 33

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Postmark or Date
Sep. 28, 1999<PAGE>

                                                                  EXHIBIT 10.23

                               CLOSING AGREEMENT

         THIS CLOSING AGREEMENT ("Closing Agreement") is made and entered into
by and among SDR Metro Inc. (a/k/a SDR Metro Incorporated), an Ohio corporation
("SDR"), Brent Simon ("INVENTOR"), and RadioMetrix, Inc. (a/k/a Radio Metrix
Inc.) ("RADIOMETRIX"), a Florida corporation, as of this 8th day of January
2002.

         WHEREAS, on October 9, 2000 SDR, INVENTOR and RADIOMETRIX entered into
that certain Agreement setting forth the terms and conditions to which SDR and
INVENTOR would sell to RADIOMETRIX or its assigns, and RADIOMETRIX or its
assigns would purchase the PATENT and the PATENT RIGHTS as defined in the
Agreement ("Purchase Agreement"); and

         WHEREAS, pursuant to that certain Extension Agreement entered into by
SDR, INVENTOR and RADIOMETRIX, as of September 25, 2001 ("Extension
Agreement"), the Closing on the aforedescribed purchase is to occur no later
than January 9, 2002; and

         WHEREAS, in accordance with Paragraph 4.b) of the Purchase Agreement,
the parties wish to enter into this Closing Agreement to clarify certain
matters and effectuate the transaction and the conveyance of the PATENT and
PATENT RIGHTS to RADIOMETRIX.

         NOW, THEREFORE, in consideration of the foregoing recitals and of the
mutual promises made herein, and for other good and valuable consideration,
receipt of which is hereby acknowledged by each party, and the parties,
intending to be legally bound, hereby agree as follows:

         1.       SDR, at the closing, shall assign to RADIOMETRIX all its
right, title and interest in and to the License Agreement entered into by and
between SDR and RADIOMETRIX dated as of the 14th day of March 1992 and as
amended by that certain Amendment to License Agreement entered into by the
parties dated February 14, 1997 and May 26, 1998 ("License Agreement"). The
Assignment of License Agreement shall be in the form attached hereto as Exhibit
"A".

         2.       SDR and INVENTOR represent, warrant, confirm, and reaffirm to
RADIOMETRIX and SMARTGATE that:

                  a.       RADIOMETRIX and SDR have each fully met all of their
respective obligations under the License Agreement;

                  b.       Neither SDR nor INVENTOR has any claim or right,
title or interest in or to any improvements or inventions, whether or not the
subject of patent applications, or any proprietary information or trade secrets
that may improve, benefit or augment the TECHNOLOGY (collectively referred to
as "RADIOMETRIX' IMPROVEMENTS TO THE TECHNOLOGY") that RADIOMETRIX or
SmartGate Inc. and SmartGate, L.C. (collectively "SMARTGATE"), the Sublicense
of RADIOMETRIX or their respective employees or associates may have made
since the date of the License Agreement or that may be made in the future,
nor does SDR or INVENTOR have any claim or right, title and interest in or to
any patents or patent applications filed by RADIOMETRIX or SMARTGATE relating to
the PATENT, PATENT RIGHTS or TECHNOLOGY that RADIOMETRIX or SMARTGATE may have
filed since entering into the License Agreement or that may be filed in the
future. SDR and INVENTOR further agree to execute such documents, including
documents of assignment and conveyance as RADIOMETRIX may, in the future,
request which documents shall reflect, agree and confirm that RADIOMETRIX or
its assigns have received all of the right, title and interest of

<PAGE>

                                                                              2

SDR and INVENTOR in and to the PATENT and PATENT RIGHTS, and TECHNOLOGY, and
any and all of RADIOMETRIX' IMPROVEMENTS TO THE TECHNOLOGY past or future;

                  c.       All of the representations and warranties of SDR, as
set forth in Paragraph 6 of the License Agreement, are incorporated into this
Closing Agreement by reference and made an integral part hereof, and remain
true and correct, and are reaffirmed and shall remain true and correct
following the Closing, and shall survive the Closing and payment of the
Promissory Note;

                  d.       INVENTOR is the sole inventor, and SDR is the sole
owner of the PATENT, PATENT RIGHTS and TECHNOLOGY being sold under the
Agreement, and that no other person nor entity has any right, title or
interest in or claim to the PATENT, PATENT RIGHTS or TECHNOLOGY, and should any
person or entity assert any such right, title or interest or claim, SDR and
INVENTOR shall defend and hold RADIOMETRIX harmless with respect to any such
claim, and in the event any such claim is asserted during the period the
Promissory Note remains unpaid, SDR and INVENTOR agree that RADIOMETRIX shall
have the right to set any such claim, cost, expense, recovery or settlement off
against its obligation to pay the Promissory Note;

                  e.       SDR and INVENTOR acknowledge that Samuel S. Duffey
and Duffey & Dolan, P.A. have served as legal counsel only to RADIOMETRIX with
respect to the License Agreement, Purchase Agreement, Extension Agreement, and
this Closing Agreement. SDR and INVENTOR further acknowledge they have each been
advised to and have had the opportunity to seek and rely upon their own counsel
with respect to the License Agreement, Purchase Agreement, Extension Agreement
and this Closing Agreement and that neither SDR nor INVENTOR has received nor
relied upon any legal advice from RADIOMETRIX' legal counsel.

                  f.       SDR has full and complete authority to enter into
and close the Purchase Agreement and to execute and deliver the Assignment,
Assignment of License Agreement and this Closing Agreement.

                  g.       Attached, are true and correct copies of Minutes of
a Meeting of Stockholders and Directors of SDR, which meeting was duly and
legally conducted and which authorized and approved the Purchase Agreement,
this Closing Agreement, the Assignment, Assignment of License Agreement and all
transactions and actions reflected therein, and expressly authorized SDR's
officers to execute, deliver and carry out the intentions of said agreements
and documents.

                  h.       Neither SDR nor INVENTOR require the consent or
approval of any third party to enter into the Purchase Agreement, this Closing
Agreement, the Assignment or the Assignment of License Agreement and the
execution of such documents will not violate or breach any agreement or
obligation to which SDR or INVENTOR is a party.

                  i.       The correct corporate name of SDR is SDR Metro Inc.
The License Agreement, Purchase Agreement and Extension to the Purchase
Agreement each contained a typographical error which referred to SDR as SDR
Metro Incorporated. SDR expressly acknowledges that the reference to SDR Metro
Incorporated means SDR Metro Inc. and each of said documents are hereby
ratified in full. This Closing Agreement and all of the closing documents under
the Purchase Agreement shall reflect the proper name of SDR (i.e., - SDR Metro
Inc.)

<PAGE>
                                                                              3

         3.       RADIOMETRIX represents, warrants, confirms, and reaffirms to
SDR and INVENTOR that:

                  a.       RADIOMETRIX' obligation to deliver the cash portion
of the purchase price and its obligations to pay the Promissory Note in
accordance with its terms, and its obligations under Security Agreement
establishing SDR's security interest in the PATENT and pledging the PATENT as
collateral for payment of the Promissory Note is hereby reaffirmed;

                  b.       The correct corporate name of RADIOMETRIX is Radio
Metrix Inc. The License Agreement, Purchase Agreement and Extension to the
Purchase Agreement each contained typographical errors which referred to
RADIOMETRIX as Radio Metrix Incorporated or Radio Metrix, Inc. RADIOMETRIX
expressly acknowledges that the reference to Radio Metrix Incorporated or Radio
Metrix, Inc. means Radio Metrix Inc. and each of said documents are hereby
ratified in full. This Closing Agreement and all of the closing documents under
the Purchase Agreement shall reflect the proper name of RADIOMETRIX (i.e. -
Radio Metrix Inc.)

         4.       The parties agree that as an additional closing document in
accordance with Paragraph 4.b) of the Purchase Agreement, SDR shall, as
requested by Patent Attorney, Thomas E. Anderson, execute at Closing the
Assignment for recordation in the Patent Office as attached hereto as Exhibit
"B".

         5.       This Closing Agreement is a supplement to the Purchase
Agreement and Extension Agreement and shall be interpreted so as to be
consistent with those agreements, and shall survive the Closing of the purchase
of the PATENT and PATENT RIGHTS.

         6.       Attached as Exhibit "C" is the Promissory Note to be
delivered by RADIOMETRIX to SDR at closing which has been revised from the
form of Note attached to the Purchase Agreement to reflect: (i) Radio Metrix
Inc. as the Maker instead of "Radio Metrix, Inc."; (ii) SDR Metro Inc. as Payee
instead of "SDR Metro Incorporated"; and (iii) to reference the Remedy Upon
Default Agreement.

         7.       RADIOMETRIX and INVENTOR agree that with respect to a
consulting relationship between RADIOMETRIX and INVENTOR, it is the parties
intention to negotiate and enter into a formal consulting agreement, and until
such time, the terms of the consulting relationship shall be as set forth in
that certain Memo from RADIOMETRIX to INVENTOR dated August 28, 2000 and
attached hereto as Exhibit "D".

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

 SDR Metro Inc.                          Radio Metrix Inc.
 an Ohio corporation                     a Florida corporation

 By:   /s/ David L. E. Jones, President         By:  /s/ S.A. Michael, President
      ---------------------------------             ----------------------------
 Its:                                    Its:  President

 Brent Simon

         /s/ Brent Simon
-----------------------------------

<PAGE>

                        ASSIGNMENT OF LICENSE AGREEMENT

         WHEREAS, SDR METRO Inc., a corporation of the State of Ohio, having
its principal place of business at 27367 Tungsten Road, Euclid, Ohio 44132,
hereinafter called Assignor, is a party to that certain License Agreement
entered into by and between SDR Metro Inc. and Radio Metrix Inc. dated as of
the 14th day of March 1992 and as amended by that certain Amendment to License
Agreement entered into by the parties dated February 14, 1997 and May 26, 1998
("License Agreement") and desires to assign its right, title and interest in
and to the License Agreement to Radio Metrix Inc.

         WHEREAS, Radio Metrix Inc., a corporation of the State of Florida
("Assignee"), having its principal place of business at 4400 Independence Court,
Sarasota, Florida 34234, desires to acquire SDR Metro Inc.'s entire right,
title and interest in and to the License Agreement.

         NOW, THEREFORE, for and in consideration of the sum of One Dollar
($1.00) and other good and valuable considerations, receipt whereof is hereby
acknowledged, Assignor, by these presents, does sell, assign and transfer unto
said Assignee, its successors and assigns, all right, title and interest in the
License Agreement.

         Assignor hereby agrees to execute any and all papers, including
further assignment documents of any and all kinds in any and all countries, and
to perform any and all acts which assignee may deem necessary to secure thereto
the rights herein assigned, sold and set over.

                                   EXHIBIT A

<PAGE>

         Assignor further represents and warrants that it has not granted any
rights inconsistent with the rights granted herein.

                                           SDR METRO INC.

                                           By
                                              --------------------------------

                                           Title:
                                                  ----------------------------

 State of                      )
          --------------------

                                  )SS

 County of                     )
          --------------------

         On this     day of                          ,200 , before me personally
                 ---        ------------------------

appeared                         , to me known to be the person named in and who
         -----------------------
executed the above instrument and acknowledged that he executed the same for the
uses and purposes therein mentioned.

                                               Notary Public

(SEAL)

<PAGE>

           UNANIMOUS JOINT WRITTEN CONSENT OF THE BOARD OF DIRECTORS
                      AND STOCKHOLDERS OF SDR METRO INC.

         The undersigned, as all of the members of the Board of Directors of
SDR METRO INC., ("Company") and all of the shareholders thereof, hereby jointly
consent to the following resolutions:

         WHEREAS, Company and RadioMetrix Incorporated (i.e. - Radio Metrix
Inc., a Florida corporation ["RadioMetrix"]), entered into a License Agreement
as of the 14th day of March 1992, and an Amendment thereto dated by the
parties on February 14, 1997 and May 26, 1998 respectively (collectively
hereinafter referred to as the "License Agreement").

         WHEREAS, Company, Brent Simon and RadioMetrix, Inc. entered into a
Purchase Agreement dated October 9, 2000 as extended by that certain Extension
Agreement entered into by and among the same parties on September 25, 2001
pursuant to which the Secured Party and Brent Simon agreed to sell to
RadioMetrix U.S. Patent No. 5,337,039 ("Patent") (collectively hereinafter
referred to as the "Purchase Agreement");

         WHEREAS, as part of the closing of the Purchase Agreement, the Board
of Directors of and stockholders of SDR METRO INC. wish to authorize, ratify,
approve and confirm the matters set forth below; be it then

         RESOLVED, and this confirms that the License Agreement and the
Company's assignment of same to RadioMetrix is hereby ratified, authorized and
approved.

         RESOLVED, and this confirms that the Purchase Agreement and the
closing of the Purchase Agreement are hereby ratified, authorized and approved;
and

         RESOLVED, and this confirms that the undersigned shareholders waive
any and all dissenter's rights under Ohio law and specifically hereby confirm
they will not be asserting any dissenter's rights with regard to the sale of
the Patent pursuant to the Purchase Agreement and the closing thereof.

         RESOLVED, that the following closing documents to the Purchase
Agreement are authorized, ratified and approved, and the Company's officers
are authorized and instructed to execute and deliver them, and any other
documents necessary to effectuate the resolutions set forth hereinabove:
Assignment of License Agreement, revised Promissory Note, Security Agreement,
Remedy Upon Default Agreement, Assignment, and Closing Agreement; and

         RESOLVED, and this confirms that the correct name of the corporation
is SDR METRO INC. and that while due to a typographical error SDR METRO INC.
was shown as SDR METRO INCORPORATED as a party to the Purchase Agreement and
License Agreement, SDR METRO INC. is the party to those agreements and each of
said contracts is hereby ratified in full.

DATE: January 8, 2002

DIRECTORS                              STOCKHOLDERS

      /s/ Roger Keith                          /s/ Roger Keith
--------------------------------       --------------------------------

          Roger Keith                              Roger Keith
--------------------------------       --------------------------------

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

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

<PAGE>

                                   ASSIGNMENT

         WHEREAS, SDR Metro Inc., a corporation of the State of Ohio, having
its principal place of business at 27367 Tungsten Road, Euclid, Ohio 44132,
hereinafter called Assignor, has title to the United States Patent Number
5,337,039.

         WHEREAS, Radio Metrix Inc., a corporation of the State of Florida
having its principal place of business at 4400 Independence Court, Sarasota,
Florida 34234, desires to acquire the entire right, title and interest in and
to said patent.

         NOW, THEREFORE, for and in consideration of the sum of One Dollar
($1.00) and other good and valuable considerations, receipt whereof is hereby
acknowledged, Assignor by these presents does sell, assign and transfer unto
said Assignee, its successors and assigns, all right, title and interest in the
United States of America to said patent, including all extensions, reissue
patents, and corresponding foreign equivalents and all inventions covered by
said patent.

         Assignor hereby agrees to execute any and all papers, including
further assignment documents of any and all kinds in any and all countries, and
to perform any and all acts which assignee may deem necessary to secure thereto
the rights herein assigned, sold and set over.

                                   EXHIBIT B

<PAGE>

         Assignor further represents and warrants that it has not granted any
rights inconsistent with the rights granted herein.

                                           SDR METRO INC.

                                           By
                                              --------------------------------

                                           Title:
                                                  ----------------------------

 State of                      )
          --------------------

                                  )SS

 County of                     )
          --------------------

         On this ___ day of ________________________, 200_, before me personally
appeared _______________________, to me known to be the person named in and who
executed the above instrument and acknowledged that he executed the same for the
uses and purposes therein mentioned.

                                               Notary Public

(SEAL)

<PAGE>

                                      Note

$600,000                                    Euclid, Ohio
                                                         ----------------------
                                                                (Date)

Radio Metrix Inc., after date for value received, promises to pay SDR Metro
Inc., an Ohio corporation, the sum of Six Hundred Thousand Dollars ($600,000),
with interest at the rate of eight per cent (8%) per annum, payable quarterly,
with principal due in one installment at the end of the twenty-fourth (24th)
month from the date hereof;

AND SUBJECT TO: (I) COMPLIANCE BY SDR METRO INC. AND BRENT SIMON, WITH THE
TERMS AND CONDITIONS OF THE AGREEMENT ENTERED INTO BY AND BETWEEN THEM AND
RADIO METRIX INC. ON OCTOBER 9, 2000; AND (II) WRITTEN NOTICE OF DEFAULT OF
THIS NOTE, PROVIDED BY CERTIFIED MAIL, RETURN RECEIPT REQUESTED, SENT TO
STEPHEN A. MICHAEL, PRESIDENT, 4400 INDEPENDENCE COURT, SARASOTA, FLORIDA 34234
AND SEPARATELY BY CERTIFIED MAIL, RETURN RECEIPT REQUESTED, TO SAMUEL S.
DUFFEY, CHAIRMAN, 4400 INDEPENDENCE COURT, SARASOTA, FLORIDA 34234, PROVIDING
NOTICE OF DEFAULT AND TEN (10) CALENDAR DAYS WITHIN WHICH RADIO METRIX INC. MAY
CURE SAID DEFAULT, RADIO METRIX INC. DOES HEREBY AUTHORIZE ANY ATTORNEY AT LAW
TO APPEAR FOR RADIO METRIX INC. IN AN ACTION ON THE ABOVE NOTE, AT ANY TIME
AFTER SAID NOTE BECOMES DUE, IN ANY COURT OF RECORD SITUATED IN THE COUNTY
WHERE RADIO METRIX INC. THEN RESIDES OR IN THE COUNTY WHERE RADIO METRIX INC.
SIGNED THIS WARRANT AND BEING IN THE UNITED STATES, TO WAIVE THE ISSUING AND
SERVICE OF PROCESS, AND CONFESS A JUDGMENT IN FAVOR OF THE LEGAL HOLDER OF THE
ABOVE AGAINST RADIO METRIX INC., FOR THE AMOUNT THAT MAY THEN BE DUE THEREON,
WITH INTEREST AT THE RATE THEREIN MENTIONED, AND COSTS OF SUIT, AND TO WAIVE
AND RELEASE ALL ERRORS IN SAID PROCEEDINGS AND THE RIGHT OF APPEAL FROM THE
JUDGMENT RENDERED.

WARNING: BY SIGNING THIS PAPER YOU GIVE UP YOUR RIGHT TO NOTICE AND COURT
TRIAL. IF YOU DO NOT PAY ON TIME A COURT JUDGMENT MAY BE TAKEN AGAINST YOU
WITHOUT YOUR PRIOR KNOWLEDGE AND THE POWERS OF A COURT CAN BE USED TO COLLECT
FROM YOU OR YOUR EMPLOYER REGARDLESS OF ANY CLAIMS YOU MAY HAVE AGAINST THE
CREDITOR WHETHER FOR RETURNED GOODS, FAULTY GOODS, FAILURE ON ITS PART TO
COMPLY WITH THE AGREEMENT OR ANY OTHER CAUSE.

                                             Radio Metrix Inc.

                                      By:
                                          ------------------------------------
                                           Stephen A. Michael, Its: President

         The rights of the parties hereunder shall, in the event of default
hereof, be governed by the Remedy upon Default Agreement executed on even date
by SDR Metro Inc. and Radio Metrix Inc.

 Radio Metrix Inc.                           SDR Metro Inc.

 By:                                         By:
     -------------------------------            -------------------------------
         Stephen A. Michael
 As Its:                                     As Its:

                                   EXHIBIT C

<PAGE>

                                                           RADIO METRIX, INC.

MEMO

To:           Brent Simon, SDR Metro, Inc.         via: fax
From:         S. A. Michael, President                     --------------------
CC:           SSD, file                                    --------------------
Date:         8/28/00
Re:           Consulting Agreement

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

Brent,

Your continued involvement in the development of technologies attractive to
Radio Metrix, Inc. can only be positive. Because we believe this to be true we
have decided to accept your offer of consultation to Radio Metrix, Inc. Your
experience and creativity should be a productive addition to the R & D process.
This decision is important and will hopefully lead to a deeper involvement as
successful development projects follow.

Our legal department will (simultaneously with the execution of the patent
purchase agreement) prepare a consulting agreement, which will set forth our
mutual understanding. The following are some of the points to which we have
tentatively agreed:

1.       All developments and inventions which are covered by or which
         constitute a continuation, improvement, expansion or incorporation of
         Patent No. 5,337,039 will be the exclusive property of Radio Metrix,
         Inc. You will execute any assignments, reasonably requested by Radio
         Metrix, Inc. to reflect its ownership.

2.       As your availability permits, you will provide problem solving and
         development engineering services to Radio Metrix, Inc., based on tasks
         requested by Radio Metrix, Inc. which are intended to support the
         ongoing R & D of the technology described in Paragraph 1 above. For
         such tasks, you will be paid out-of-pocket expense reimbursements
         immediately upon the submission of two working prototypes, complete
         schematics and drawings, and a materials list of the task assigned
         together with appropriate receipts. Any expense in excess of $500.00
         will require pre-approval in writing from Radio Metrix, Inc.
         Approved expenses will be limited to hardware, components, assembly
         materials and other verifiable non-time, non-space and non-travel
         expenses necessary to complete the tasks assigned by Radio Metrix,
         Inc. and accepted by you. All products of such assigned tasks will be
         the property of Radio Metrix, Inc.

3        Should you identify additional projects or tasks which are outside of
         the material covered in Paragraph 1 hereof, and which are free to be
         controlled by mutual confidentiality agreements between the parties,
         you will submit same in detailed writing to Radio Metrix, Inc. for
         concept review. Should Radio Metrix, Inc., upon completion of review,
         accept the responsibility to fund "first stage" confidential
         development of your concept, you will then be authorized in writing to
         pursue the development and to submit prototypes exclusively to Radio
         Metrix, Inc. for viability review. In such instances, upon the
         submission of the prototypes, complete schematics and drawings,
         material lists, and appropriate receipts, you will be reimbursed for
         out-of-pocket expenses. Any out-of-pocket expense in excess of $500.00
         will require advanced written approval. Should Radio Metrix, Inc.
         determine, in the exercise of its discretion to proceed with ongoing
         development or commercialization of the developments or inventions
         developed under this Paragraph, the parties will execute a written
         agreement setting forth ownership of the technology/invention, future
         compensation if the technology is commercialized, and specific
         authorization and funding/expense reimbursement agreements regarding
         further stages of development.

                                   EXHIBIT D

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