<PAGE>   1
                                                                 EXHIBIT 10.9


                            STOCK PURCHASE AGREEMENT

         THIS STOCK PURCHASE AGREEMENT (the "Agreement") is made this day 17th
March 1999 by and between LANDA MANAGEMENT SYSTEMS CORPORATION, a California
corporation (the "Company"), and Eugene Santa Cattarina, ("Purchaser").

                                  WITNESSETH:

         WHEREAS, Purchaser holds a stock option dated October 20th, 1998 to
purchase shares of common stock of the Company (the "Option") pursuant to the
Company's 1998 Equity Incentive Plan (the "Plan") which Purchaser desires to
exercise; and

         WHEREAS, Purchaser wishes to take advantage of the early exercise
provision of the Option, and therefore to enter into this Agreement.

         NOW, THEREFORE, IT IS AGREED between the parties as follows:

         1. Purchaser hereby agrees to purchase from the Company, and the
Company hereby agrees to sell to Purchaser, an aggregate of eight hundred and
five thousand, five hundred and fifty shares (805,550) of common stock (the
"Stock") of the Company, for a purchase price of 12/100 US dollars ($0.12) per
share (total purchase price: Ninety six thousand, six hundred and sixty six
00/100 US dollars ($96,666.00)), payable as follows:

<TABLE>
<S>                                                     <C>
               Cash at Closing                          $      0.00

               Promissory Note in the form
               of Exhibit D (the "Note")                $ 96,666.00
                                                        -----------

               Total Purchase Price                     $ 96,666.00
                                                        ===========
</TABLE>

The closing hereunder shall occur at the offices of the Company on the date of
this Agreement or at such other time and place as the parties may mutually
agree upon in writing.

         At the closing, Purchaser shall deliver two (2) stock assignments in
the form of Exhibit B, duly endorsed (with date and number of shares left
blank), joint escrow instructions (the "Joint Escrow Instructions") in the form
of Exhibit C, duly executed by Purchaser, and the total purchase price
(including an executed Note in the form of Exhibit D if a portion of the total
purchase price is to be paid by promissory note and an executed pledge
agreement in the form of Exhibit E (the "Pledge Agreement") under which all
shares of the Stock acquired by Note shall be pledged as collateral security
for the payment of the indebtedness represented by the Note.

         At the closing or as soon thereafter as practicable, the Company shall
deliver to the Escrow Agent (as defined in paragraph 8 below) share
certificates for all of the Stock that is to be subject to the Purchase Option
(as defined in paragraph 2 below), and shall deliver share certificates to
Purchaser for all of the Stock, if any, that is not to be subject to the
Purchase Option or the Pledge


                                       1
<PAGE>   2



Agreement. The certificates for all of the Stock that is subject to the Pledge
Agreement but not the Purchase Option shall be retained by the Company as
security pursuant to the Pledge Agreement.

         2. The Stock to be purchased by Purchaser pursuant to this Agreement
shall be subject to the following option ("Purchase Option"):

                  (a) In the event that Purchaser's Continuous Service (as that
term is defined in the Plan) shall terminate for any reason (including
Purchaser's death), or no reason, with or without cause, the Purchase Option
may be exercised. The Company shall have the right at any time within ninety
(90) days after such termination of Continuous Service, or such longer period
as may determined by the Company if such later repurchase is deemed necessary
by the Company for treatment of its stock as Qualified Small Business Stock
under Section 1202 of the Internal Revenue Code of 1986, as amended, and
regulations promulgated thereunder, to exercise its option to repurchase from
Purchaser or his personal representative, as the case may be, at the price per
share paid by Purchaser pursuant to this Agreement ("Option Price"), up to but
not exceeding the number of unvested shares of the Stock set forth on Exhibit A
hereto, which is incorporated herein by this reference.

                  (b) In addition, and without limiting the foregoing Purchase
Option, if at any time during the term of the Purchase Option there occurs a
transaction described in Section 11(b) or 11(c) of the Plan (e.g., a
dissolution, liquidation, asset sale, merger, consolidation or reverse merger
of the Company), then: (i) the Company shall exercise the Purchase Option to
the same extent that the unvested portion of the Option would have terminated
pursuant to Section 11(b) or 11(c) of the Plan if the Option had not been
exercised pursuant to this Agreement, (ii) the Purchase Option shall lapse to
the same extent that the unvested portion of the Option would have
automatically accelerated pursuant to Section 11(c) of the Plan if the Option
had not been exercised pursuant to this Agreement or (iii) the Purchase Option
may be assigned to any successor to the Company to the same extent that the
unvested portion of the Option would have been assumed or substituted by such
successor if the Option had not been exercised pursuant to this Agreement, in
which case the Purchase Option shall apply on the same basis as set forth above
to the Stock or to the consideration received for the Stock by the Purchaser in
the transaction (as the case may be) if Purchaser's Continuous Service with
such successor terminates for any reason. The continuing or surviving entity
shall be deemed to be the successor to the Company for purposes of this
Agreement, and references herein to the "Company" shall be deemed to refer to
such successor.

                  (c) The Company shall be entitled to pay for any of the Stock
purchased pursuant to its Purchase Option at the Company's option in cash, by
offset against any indebtedness owing to the Company by Purchaser including
without limitation any note given in payment for the Stock, or a combination of
both.

                  (d) This Agreement is not an employment contract and nothing
in this Agreement shall be deemed to create in any way whatsoever any
obligation on the part of Purchaser to continue in the employ of the Company or
any Affiliate (as defined in the Plan) thereof, or of the Company or any
Affiliate thereof to continue Purchaser in its employ. In addition, nothing in
this Agreement shall obligate the Company or any Affiliate thereof, their


                                       2
<PAGE>   3





respective stockholders, boards of directors, officers or employees to continue
any relationship that you might have as a director or consultant for the
Company or any Affiliate thereof.

         3. The Purchase Option may be exercised by giving written notice of
exercise delivered or mailed as provided in paragraph 14. Upon providing of
such notice and payment or tender of the purchase price, the Company shall
become the legal and beneficial owner of the Stock being purchased and all
rights and interests therein or related thereto.

         4. If from time to time during the term of the Purchase Option there
is any stock dividend or liquidating dividend or distribution of cash and/or
property, stock split or other change in the character or amount of any of the
outstanding securities of the Company, then, in such event, any and all new,
substituted or additional securities or other property to which Purchaser is
entitled by reason of his ownership of Stock will be immediately subject to the
Purchase Option and be included in the word "Stock" for all purposes of the
Purchase Option with the same force and effect as the shares of Stock then
subject to the Purchase Option. While the total Option Price shall remain the
same after each such event, the Option Price per share of Stock upon exercise
of the Purchase Option shall be appropriately adjusted.

         5. All certificates representing any shares of Stock of the Company
subject to the provisions of this Agreement shall have endorsed thereon legends
in substantially the following form:

                  (a) "The shares represented by this certificate are subject
to an option set forth in an agreement between the Company and the registered
holder, or registered holder's predecessor in interest, a copy of which is on
file at the principal office of this Company. Any transfer or attempted
transfer of any shares subject to such option is void without the prior express
written consent of the issuer of these shares."

                  (b) "These securities have not been registered under the
Securities Act of 1933. They may not be sold, offered for sale, pledged or
hypothecated in the absence of an effective registration statement as to the
securities under said Act or an opinion of counsel satisfactory to the Company
that such registration is not required."

                  (c) "The shares represented by this certificate are subject to
a right of first refusal option in favor of the Company and/or its assignee(s)
as provided in the Bylaws of the Company."

                  (d) "Any legend required to be placed thereon by the
California Commissioner of Corporations.

         6. Purchaser acknowledges that he or she is aware that the Stock to be
issued to him or her by the Company pursuant to this Agreement has not been
registered under the Securities Act of 1933, as amended (the "Act"), on the
basis that no distribution or public offering of the Stock is to be effected,
and in this connection acknowledges that the Company is relying on the
following representations. In this connection, Purchaser warrants and
represents to the Company that he or she is acquiring the Stock for investment
and not with a view to or for sale in

                                       3
<PAGE>   4




connection with any distribution of the Stock or with any present intention of
distributing or selling the Stock and he or she does not presently have reason
to anticipate any change in circumstances or any particular occasion or event
which would cause him or her to sell the Stock. Purchaser recognizes that the
Stock must be held indefinitely unless it is subsequently registered under the
Act or an exemption from such registration is available and, further,
recognizes that the Company is under no obligation to register the Stock or to
comply with any exemption from such registration.

         7. Purchaser is aware that the Stock may not be sold pursuant to Rule
144 adopted under the Act unless certain conditions are met and until Purchaser
has held the Stock for the applicable holding period set forth in Rule 144.
Among the conditions for use of Rule 144 is the availability of specified
current public information about the Company. Purchaser recognizes that the
Company presently has no plans to make such information available to the
public.

         Whether or not the Purchase Option is exercised or has lapsed,
Purchaser further agrees not to make any disposition of any of the Stock in any
event unless and until:

                  (a) There is then in effect a registration statement under
the Act covering such proposed disposition and such disposition is made in
accordance with such registration statement; or

                  (b) (i) Purchaser shall have notified the Company of the
proposed disposition and shall have furnished the Company with a detailed
statement of the circumstances surrounding the proposed disposition, and (ii)
Purchaser shall have given the Company an opinion of counsel, which opinion and
counsel shall be satisfactory to the Company, to the effect that such
disposition will not require registration of the Stock under the Act.

         8. As security for his faithful performance of the terms of this
Agreement and to insure the availability for delivery of Purchaser's Stock upon
exercise of the Purchase Option herein provided for, Purchaser agrees, at the
closing hereunder (or as soon thereafter as practicable), to deliver (or have
the Company deliver on the Purchaser's behalf) to and deposit with the
Secretary of the Company ("Escrow Agent"), as Escrow Agent in this transaction,
two (2) stock assignments duly endorsed (with date and number of shares left
blank) in the form attached hereto as Exhibit B, together with a certificate or
certificates evidencing all of the Stock subject to the Purchase Option; said
documents are to be held by the Escrow Agent and delivered by said Escrow Agent
pursuant to the Joint Escrow Instructions of the Company and Purchaser set
forth in Exhibit C attached hereto and incorporated herein by this reference,
which instructions shall also be delivered to the Escrow Agent at the closing
hereunder (or as soon thereafter as practicable).

         9. Purchaser shall not sell or transfer any of the Stock subject to
the Purchase Option or any interest therein so long as such Stock is subject to
the Purchase Option. In addition, the Purchaser agrees that the Company (or a
representative of the underwriters) may, in connection with the first
underwritten registration of the offering of any securities of the Company
under the Act, require that Purchaser not sell, dispose of, transfer, make any
short sale of, grant any option for the purchase of, or enter into any hedging
or similar transaction with the same economic




                                       4
<PAGE>   5





effect as a sale, any of the Stock or other securities of the Company held by
you, for a period of time specified by the underwriter(s) (not to exceed one
hundred eighty (180) days) following the effective date of the registration
statement of the Company filed under the Act.

         10. The Company shall not be required (a) to transfer on its books any
shares of Stock of the Company which shall have been sold or transferred in
violation of any of the provisions set forth in this Agreement or (b) to treat
as owner of such shares or to accord the right to vote as such owner or to pay
dividends to any transferee to whom such shares shall have been so transferred.

         11. Subject to the provisions of paragraphs 9 and 10 above, Purchaser
(but not any unapproved transferee) shall, during the term of this Agreement,
exercise all rights and privileges of a stockholder of the Company with respect
to the Stock.

         12. The shares of Stock purchased under the terms of this Agreement
are subject to the right of first refusal provided for in the Bylaws of the
Company.

         13. The parties agree to execute such further instruments and to take
such further action as reasonably may be necessary to carry out the intent of
this Agreement.

         14. Any notice required or permitted hereunder shall be given in
writing and shall be deemed effectively given upon personal delivery or upon
deposit in any United States Post Office Box, by registered or certified mail
with postage and fees prepaid, addressed to the other party hereto at his
address hereinafter shown below his signature or at such other address as such
party may designate by ten (10) days' advance written notice to the other party
hereto.

         15. This Agreement shall bind and inure to the benefit of the
successors and assigns of the Company and, subject to the restrictions on
transfer herein set forth, inure to the benefit of and be binding upon
Purchaser, his heirs, executors, administrators, successors, and assigns.
Without limiting the generality of the foregoing, the Purchase Option of the
Company hereunder shall be assignable by the Company at any time or from time
to time, in whole or in part.



                                       5
<PAGE>   6





         IN WITNESS WHEREOF, the parties hereto have executed this Stock
Purchase Agreement as of the day and year first set forth above.

                                            LANDA MANAGEMENT SYSTEMS CORPORATION

                                            By: /s/ STEPHEN P. KAY
                                               --------------------------------

                                            Its: COO/CFO
                                                -------------------------------

                              Address:      1072 Marauder Street, Suite A
                                            Chico, CA 95973

                                            /s/ EUGENE SANTA CATTARINA
                                            -----------------------------------
                                            EUGENE SANTA CATTARINA

                              Address:

ATTACHMENTS:

Exhibit A       Vesting Schedule
Exhibit B       Assignment Separate from Certificate
Exhibit C       Joint Escrow Instructions
Exhibit D       Promissory Note
Exhibit E       Pledge Agreement



                                       6
<PAGE>   7
                                   EXHIBIT A
                                VESTING SCHEDULE

<TABLE>
<CAPTION>
IF CONTINUOUS SERVICE                            NUMBER OF UNVESTED SHARES
TERMINATES:                                     SUBJECT TO PURCHASE OPTION:
<S>                                             <C>
Before 19th July 1999                                805,550.0 shares

After 19th July 1999
 but before 19th August 1999                         604,162.5 shares

After 19th August 1999
 but before 19th September 1999                      587,380.2 shares

After 19th September 1999
 but before 19th October 1999                        570,597.9 shares

After 19th October 1999
 but before 19th November 1999                       553,815.6 shares

After 19th November 1999
 but before 19th December 1999                       537,033.3 shares

After 19th December 1999
 but before 19th January 2000                        520,251.0 shares

After 19th January 2000
 but before 19th February 2000                       503,468.7 shares

After 19th February 2000
 but before 19th March 2000                          486,686.4 shares

After 19th March 2000
 but before 19th April 2000                          469,904.1 shares

After 19th April 2000
 but before 19th May 2000                            453,121.8 shares
</TABLE>

                                       1
<PAGE>   8
                             EXHIBIT A (CONTINUED)
                                VESTING SCHEDULE

<TABLE>
<CAPTION>
IF CONTINUOUS SERVICE                           NUMBER OF UNVESTED SHARES
TERMINATES:                                     SUBJECT TO PURCHASE OPTION:
<S>                                             <C>

After 19th May 2000
 but before 19th June 2000                           436,339.5 shares

After 19th June 2000
 but before 19th July 2000                           419,557.2 shares

After 19th July 2000
 but before 19th August 2000                         402,774.9 shares

After 19th August 2000
 but before 19th September 2000                      385,992.6 shares

After 19th September 2000
 but before 19th October 2000                        369,210.3 shares

After 19th October 2000
 but before 19th November 2000                       352,428.0 shares

After 19th November 2000
 but before 19th December 2000                       335,645.7 shares

After 19th December 2000
 but before 19th January 2001                        318,863.4 shares

After 19th January 2001
 but before 19th February 2001                       302,081.1 shares

After 19th February 2001
 but before 19th March 2001                          285,298.8 shares
</TABLE>


                                       2.
<PAGE>   9
                             EXHIBIT A (CONTINUED)
                                VESTING SCHEDULE

<TABLE>
<CAPTION>
IF CONTINUOUS SERVICE                           NUMBER OF UNVESTED SHARES
TERMINATES:                                     SUBJECT TO PURCHASE OPTION:
<S>                                             <C>
After 19th March 2001
 but before 19th April 2001                          268,516.5 shares

After 19th April 2001
 but before 19th May 2001                            251,734.2 shares

After 19th May 2001
 but before 19th June 2001                           234,951.9 shares

After 19th June 2001
 but before 19th July 2001                           218,169.6 shares

After 19th July 2001
 but before 19th August 2001                         201,387.3 shares

After 19th August 2001
 but before 19th September 2001                      184,605.0 shares

After 19th September 2001
 but before 19th October 2001                        167,822.7 shares

After 19th October 2001
 but before 19th November 2001                       151,040.4 shares

After 19th November 2001
 but before 19th December 2001                       134,258.1 shares

After 19th December 2001
 but before 19th January 2002                        117,475.8 shares
</TABLE>


                                       3
<PAGE>   10
                             EXHIBIT A (CONTINUED)
                                VESTING SCHEDULE

<TABLE>
<CAPTION>
IF CONTINUOUS SERVICE                           NUMBER OF UNVESTED SHARES
TERMINATES:                                     SUBJECT TO PURCHASE OPTION:
<S>                                             <C>
After 19th January 2002
 but before 19th February 2002                        100,693.5 shares

After 19th February 2002
 but before 19th March 2002                            83,911.2 shares

After 19th March 2002
 but before 19th April 2002                            67,128.9 shares

After 19th April 2002
 but before 19th May 2002                              50,346.6 shares

After 19th May 2002
 but before 19th June 2002                             33,564.3 shares

After 19th June 2002
 but before 19th July 2002                             16,782.0 shares

After 19th July 2002                                        0.0 shares
</TABLE>

                                       4
<PAGE>   11

                                   EXHIBIT B

                      ASSIGNMENT SEPARATE FROM CERTIFICATE

         FOR VALUE RECEIVED and pursuant to that certain Stock Purchase
Agreement dated as of 17th March 1999, (the "Agreement") Eugene Santa Cattarina
hereby sells, assigns and transfers unto Landa Management Systems Corporation
____________________(___)shares of common stock of Landa Management Systems
Corporation, a California corporation, standing in the undersigned's name on the
books of said corporation represented by Certificate No. _____ herewith, and
does hereby irrevocably constitute and appoint __________________ attorney to
transfer the said stock on the books of the said corporation with full power of
substitution in the premises. This Assignment may be used only in accordance
with and subject to the terms and conditions of the Agreement, in connection
with the repurchase of shares of Common Stock issued to the undersigned pursuant
to the Agreement, and only to the extent that such shares remain subject to the
Company's Purchase Option under the Agreement.

Dated:
      ------------------

                                        /s/ EUGENE SANTA CATTARINA
                                        ---------------------------------
                                        [Signature]


                                        Eugene Santa Cattarina
                                        ---------------------------------


[INSTRUCTION: Please do not fill in any blanks other than the signature line.
The purpose of this Assignment is to enable the Company to exercise its
repurchase option set forth in the Agreement without requiring additional
signatures on the part of Purchaser.]




<PAGE>   12

                                   EXHIBIT B

                      ASSIGNMENT SEPARATE FROM CERTIFICATE

         FOR VALUE RECEIVED and pursuant to that certain Stock Purchase
Agreement dated as of 17th March 1999, (the "Agreement") Eugene Santa Cattarina
hereby sells, assigns and transfers unto Landa Management Systems Corporation
____________________(___)shares of common stock of Landa Management Systems
Corporation, a California corporation, standing in the undersigned's name on the
books of said corporation represented by Certificate No. _____ herewith, and
does hereby irrevocably constitute and appoint __________________ attorney to
transfer the said stock on the books of the said corporation with full power of
substitution in the premises. This Assignment may be used only in accordance
with and subject to the terms and conditions of the Agreement, in connection
with the repurchase of shares of Common Stock issued to the undersigned pursuant
to the Agreement, and only to the extent that such shares remain subject to the
Company's Purchase Option under the Agreement.

Dated:
      ------------------

                                        /s/ EUGENE SANTA CATTARINA
                                        ---------------------------------
                                        [Signature]


                                        Eugene Santa Cattarina
                                        ---------------------------------


[INSTRUCTION: Please do not fill in any blanks other than the signature line.
The purpose of this Assignment is to enable the Company to exercise its
repurchase option set forth in the Agreement without requiring additional
signatures on the part of Purchaser.]





<PAGE>   13

                                   EXHIBIT C

                           JOINT ESCROW INSTRUCTIONS



Stephen P. Kay, Company Secretary
Landa Management Systems Corporation
1072 Marauder, Suite A
Chico, CA 95973

Dear Sir:

         As Escrow Agent for both Landa Management Systems Corporation, a
California corporation ("Company"), and the undersigned purchaser of stock of
the Company ("Purchaser"), you are hereby authorized and directed to hold the
documents delivered to you pursuant to the terms of that certain Stock Purchase
Agreement ("Agreement"), dated 17TH MARCH 1999, to which a copy of these Joint
Escrow Instructions is attached as Exhibit C in accordance with the following
instructions:

         1. In the event the Company or an assignee shall elect to exercise the
Purchase Option set forth in the Agreement, the Company or its assignee will
give to Purchaser and you a written notice specifying the number of shares of
stock to be purchased, the purchase price, and the time for a closing hereunder
at the principal office of the Company. Purchaser and the Company hereby
irrevocably authorize and direct you to close the transaction contemplated by
such notice in accordance with the terms of said notice.

         2. At the closing you are directed (a) to date any stock assignments
necessary for the transfer in question, (b) to fill in the number of shares
being transferred, and (c) to deliver same, together with the certificate
evidencing the shares of stock to be transferred, to the Company against the
simultaneous delivery to you of the purchase price (which may include suitable
acknowledgment of cancellation of indebtedness) of the number of shares of stock
being purchased pursuant to the exercise of the Purchase Option.

         3. Purchaser irrevocably authorizes the Company to deposit with you any
certificates evidencing shares of stock to be held by you hereunder and any
additions and substitutions to said shares as specified in the Agreement.
Purchaser does hereby irrevocably constitute and appoint you as his
attorney-in-fact and agent for the term of this escrow to execute with respect
to such securities and other property all documents of assignment and/or
transfer and all stock certificates necessary or appropriate to make all
securities negotiable and complete any transaction herein contemplated.

         4. This escrow shall terminate upon expiration or exercise in full of
the Purchase Option, whichever occurs first.



                                       1.

<PAGE>   14


         5. If at the time of termination of this escrow you should have in your
possession any documents, securities, or other property belonging to Purchaser,
you shall deliver all of same to Purchaser and shall be discharged of all
further obligations hereunder; provided, however, that if at the time of
termination of this escrow you are advised by the Company that the property
subject to this escrow is the subject of a pledge or other security agreement,
you shall deliver all such property to the pledgeholder or other person
designated by the Company.

         6. Except as otherwise provided in these Joint Escrow Instructions,
your duties hereunder may be altered, amended, modified or revoked only by a
writing signed by all of the parties hereto.

         7. You shall be obligated only for the performance of such duties as
are specifically set forth herein and may rely and shall be protected in relying
or refraining from acting on any instrument reasonably believed by you to be
genuine and to have been signed or presented by the proper party or parties or
their assignees. You shall not be personally liable for any act you may do or
omit to do hereunder as Escrow Agent or as attorney-in-fact for Purchaser while
acting in good faith and any act done or omitted by you pursuant to the advice
of your own attorneys shall be conclusive evidence of such good faith.

         8. You are hereby expressly authorized to disregard any and all
warnings given by any of the parties hereto or by any other person or
corporation, excepting only orders or process of courts of law, and are hereby
expressly authorized to comply with and obey orders, judgments or decrees of any
court. In case you obey or comply with any such order, judgment or decree of any
court, you shall not be liable to any of the parties hereto or to any other
person, firm or corporation by reason of such compliance, notwithstanding any
such order, judgment or decree being subsequently reversed, modified, annulled,
set aside, vacated or found to have been entered without jurisdiction.

         9. You shall not be liable in any respect on account of the identity,
authority or rights of the parties executing or delivering or purporting to
execute or deliver the Agreement or any documents or papers deposited or called
for hereunder.

         10. You shall not be liable for the outlawing of any rights under any
statute of limitations with respect to these Joint Escrow Instructions or any
documents deposited with you.

         11. Your responsibilities as Escrow Agent hereunder shall terminate if
you shall cease to be Secretary of the Company or if you shall resign by written
notice to each party. In the event of any such termination, the Company may
appoint any officer or assistant officer of the Company as successor Escrow
Agent and Purchaser hereby confirms the appointment of such successor or
successors as his attorney-in-fact and agent to the full extent of your
appointment.

         12. If you reasonably require other or further instruments in
connection with these Joint Escrow Instructions or obligations in respect
hereto, the necessary parties hereto shall join in furnishing such instruments.

         13. It is understood and agreed that should any dispute arise with
respect to the delivery and/or ownership or right of possession of the
securities, you are authorized and


                                       2.

<PAGE>   15


directed to retain in your possession without liability to anyone all or any
part of said securities until such dispute shall have been settled either by
mutual written agreement of the parties concerned or by a final order, decree or
judgment of a court of competent jurisdiction after the time for appeal has
expired and no appeal has been perfected, but you shall be under no duty
whatsoever to institute or defend any such proceedings.

         14. Any notice required or permitted hereunder shall be given in
writing and shall be deemed effectively given upon personal delivery, including
delivery by express courier or five days after deposit in the United States Post
Office, by registered or certified mail with postage and fees prepaid, addressed
to each of the other parties hereunto entitled at the following addresses, or at
such other addresses as a party may designate by ten days' advance written
notice to each of the other parties hereto:

         COMPANY:       Stephen P. Kay, Company Secretary
                        Landa Management Systems Corporation
                        1072 Marauder, Suite A
                        Chico, CA 95973

         PURCHASER:     Eugene Santa Cattarina

         ESCROW AGENT:  Stephen P. Kay, Company Secretary
                        Landa Management Systems Corporation
                        1072 Marauder, Suite A
                        Chico, CA 95973

         15. By signing these Joint Escrow Instructions you become a party
hereto only for the purpose of said Joint Escrow instructions; you do not become
a party to the Agreement.

         16. You shall be entitled to employ such legal counsel and other
experts (including without limitation the firm of Cooley Godward LLP) as you may
deem necessary properly to advise you in connection with your obligations
hereunder. You may rely upon the advice of such counsel, and may pay such
counsel reasonable compensation therefor. The Corporation shall be responsible
for all fees generated by such legal counsel in connection with your obligations
hereunder.

         17. This instrument shall be binding upon and inure to the benefit of
the parties hereto and their respective successors and permitted assigns. It is
understood and agreed that references to "you" or "your" herein refer to the
original Escrow Agent and to any and all successor Escrow Agents. It is
understood and agreed that the Corporation may at any time or from time to time
assign its rights under the Agreement and these Joint Escrow Instructions in
whole or in part.

         18. This Agreement shall be governed by and interpreted and determined
in accordance with the laws of the State of California, as such laws are applied
by California courts to contracts made and to be performed entirely in
California by residents of that state.



                                       3.

<PAGE>   16




                                   Very truly yours,

                                   LANDA MANAGEMENT SYSTEM CORPORATION


                                       /s/ STEPHEN P. KAY
                                   By: Stephen P. Kay, Chief Financial Officer
                                       ----------------------------------------



                                   PURCHASER

                                   /s/ EUGENE SANTA CATTARINA

                                   Eugene Santa Cattarina
                                   --------------------------------------------



Escrow Agent:



/s/ STEPHEN P. KAY
---------------------------------------
Stephen P. Kay, Company Secretary



                                       4.


<PAGE>   17


                                   EXHIBIT D

                         FULL RECOURSE PROMISSORY NOTE

$96,666.00                                                      17th MARCH 1999

         FOR VALUE RECEIVED, the undersigned hereby unconditionally promises to
pay to the order of Landa Management Systems Corporation, a California
corporation (the "Company"), at Chico, California, or at such other place as the
holder hereof may designate in writing, in lawful money of the United States of
America and in immediately available funds, the principal sum of Ninety nine
thousand six hundred sixty six 00/100 Dollars ($96,666.00) together with
interest accrued from the date hereof on the unpaid principal at the rate of
6.00% per annum, or the maximum rate permissible by law (which under the laws of
the State of California shall be deemed to be the laws relating to permissible
rates of interest on commercial loans), whichever is less, as follows:

                  PRINCIPAL REPAYMENT. The outstanding principal amount
         hereunder shall be DUE AND PAYABLE IN FULL ON MARCH l6TH, 2006.

                  INTEREST PAYMENTS. Interest shall be ACCRUED ANNUALLY and
         shall be calculated on the basis of a 360-day year for the actual
         number of days elapsed;

provided, however, that in the event that the undersigned's employment by or
association with the Company is terminated for any reason prior to payment in
full of this Note, this Note shall be accelerated and all remaining unpaid
principal and interest shall become due and payable immediately after such
termination. Moreover, the Company may, in connection with the first
underwritten registration of the offering of any securities of the Company under
the Securities Act of 1933, as amended (the "Securities Act"), require that this
Note shall be accelerated and all remaining unpaid principal and interest shall
become due and payable within two hundred ten (210) days following the effective
date of the registration statement of the Company filed under the Securities
Act.

         If the undersigned fails to pay any of the principal and accrued
interest when due, the Company, at its sole option, shall have the right to
accelerate this Note, in which event the entire principal balance and all
accrued interest shall become immediately due and payable, and immediately
collectible by the Company pursuant to applicable law.

         This Note may be prepaid at any time without penalty. All money paid
toward the satisfaction of this Note shall be applied first to the payment of
interest as required hereunder and then to the retirement of the principal.

         This Note is a full recourse promissory note. The full amount of this
Note is secured by a pledge of shares of Common Stock of the Company, and is
subject to all of the terms and provisions of the Stock Purchase Agreement and
the Pledge Agreement, each of even date herewith between the undersigned and the
Company.



                                       1.

<PAGE>   18



         The undersigned hereby represents and agrees that the amounts due under
this Note are not consumer debt, and are not incurred primarily for personal,
family or household purposes, but are for business and commercial purposes only.

         The undersigned hereby waives presentment, protest and notice of
protest, demand for payment, notice of dishonor and all other notices or demands
in connection with the delivery, acceptance, performance, default or endorsement
of this Note.

         The holder hereof shall be entitled to recover, and the undersigned
agrees to pay when incurred, all costs and expenses of collection of this Note,
including without limitation, reasonable attorneys' fees.

         This Note shall be governed by, and construed, enforced and interpreted
in accordance with, the laws of the State of California, excluding conflict of
laws principles that would cause the application of laws of any other
jurisdiction.

                                          Signed /s/ EUGENE SANTA CATTARINA
                                                 -------------------------------
                                                 Eugene Santa Cattarina



                                       2.

<PAGE>   19


                                   EXHIBIT E

                                PLEDGE AGREEMENT

         1. As collateral security for the payment of that certain $96,666.00
promissory note issued this date to Landa Management Systems Corporation
("Pledgee") by the undersigned (hereinafter called "indebtedness"), the
undersigned hereby assigns, transfers to and pledges with the Pledgee the
securities listed on Schedule 1 hereto which were this day delivered to be
deposited with Pledgee, together with any stock rights, rights to subscribe,
dividends paid in cash or other property in connection with the complete or
partial liquidation of Pledgee, stock dividends, dividends paid in stock, new
securities or other property except cash dividends other than liquidating
dividends to which the undersigned is or may hereafter become entitled to
receive on account of such property, and in the event that the undersigned
receives any such, the undersigned will immediately deliver it to Pledgee to be
held by Pledgee hereunder in the same manner as the property originally pledged
hereunder. All property assigned, transferred to and pledged with Pledgee under
this paragraph is hereinafter called "collateral."

         At any time, without notice, and at the expense of the undersigned,
Pledgee in its name or in the name of its nominee or of the undersigned may, but
shall not be obligated to: (a) collect by legal proceedings or otherwise all
dividends (except cash dividends other than liquidating dividends), interest,
principal payments and other sums now or hereafter payable upon or on account of
said collateral; (b) enter into any extension, reorganization, deposit, merger,
or consolidation agreement, or any agreement in any way relating to or affecting
the collateral, and in connection therewith may deposit or surrender control of
such collateral thereunder, accept other property in exchange for such
collateral and do and perform such acts and things as it may deem proper, and
any money or property received in exchange for such collateral shall be applied
to the indebtedness or thereafter held by it pursuant to the provisions hereof;
(c) insure, process and preserve the collateral; (d) cause the collateral to be
transferred to its name or to the name of its nominee; (e) exercise as to such
collateral all the rights, powers, and remedies of an owner, except that so long
as the indebtedness is not in default the undersigned shall retain all voting
rights as to the collateral.

         The undersigned agrees to pay prior to delinquency all taxes, charges,
liens and assessments against the collateral, and upon the failure of the
undersigned to do so Pledgee at its option may pay any of them and shall be the
sole judge of the legality or validity thereof and the amount necessary to
discharge the same.

         All advances, charges, costs and expenses, including reasonable
attorneys' fees, incurred or paid by Pledgee in exercising any right, power or
remedy conferred by this agreement, or in the enforcement thereof, shall become
a part of the indebtedness secured hereunder and shall be paid to Pledgee by the
undersigned immediately and without demand.

         At the option of Pledgee and without necessity of demand or notice, all
or any part of the indebtedness of the undersigned shall immediately become due
and payable irrespective of any agreed maturity, upon the happening of any of
the following events: (a) failure to keep or perform any of the terms or
provisions of this agreement; (b) default in the payment of principal or
interest when due; (c) the levy of any attachment, execution or other process
against the


                                       1.

<PAGE>   20


collateral; or (d) the insolvency, commission of an act of bankruptcy, general
assignment for the benefit of creditors, filing of any petition in bankruptcy or
for relief under the provisions of Title 11, United States Code, Bankruptcy, of,
by, or against the undersigned.

         In the event of the nonpayment of any indebtedness when due, whether by
acceleration or otherwise, or upon the happening of any of the events specified
in the last preceding paragraph, Pledgee may then, or at any time thereafter, at
its election, apply, set off, collect or sell in one or more sales, or take such
steps as may be necessary to liquidate and reduce to cash in the hands of
Pledgee in whole or in part, with or without any previous demands or demand of
performance or notice or advertisement, the whole or any part of the collateral
in such order as Pledgee may elect, and any such sale may be made either at
public or private sale at its place of business or elsewhere, or at any broker's
board or securities exchange, either for cash or upon credit or for future
delivery; provided, however, that if such disposition is at private sale, then
the purchase price of the collateral shall be equal to the public market price
then in effect, or, if at the time of sale no public market for the collateral
exists, then, in recognition of the fact that the sale of the collateral would
have to be registered under the Securities Act of 1933 and that the expenses of
such registration are commercially unreasonable for the type and amount of
collateral pledged hereunder, Pledgee and the undersigned hereby agree that such
private sale shall be at a purchase price mutually agreed to by Pledgee and the
undersigned or, if the parties cannot agree upon a purchase price, then at a
purchase price established by a majority of three independent appraisers
knowledgeable of the value of such collateral, one named by the undersigned
within 10 days after written request by the Pledgee to do so, one named by
Pledgee within such 10 day period, and the third named by the two appraisers so
selected, with the appraisal to be rendered by such body within 30 days of the
appointment of the third appraiser. The cost of such appraisal, including all
appraiser's fees, shall be charged against the proceeds of sale as an expense of
such sale. Pledgee may be the purchaser of any or all collateral so sold and
hold the same thereafter in its own right free from any claim of the
undersigned or right of redemption. Demands of performance, notices of sale,
advertisements and presence of property at sale are hereby waived, and Pledgee
is hereby authorized to sell hereunder any evidence of debt pledged to it. Any
sale hereunder may be conducted by any officer or agent of Pledgee.

         The proceeds of the sale of any of the collateral and all sums received
or collected by Pledgee from or on account of such collateral shall be applied
by Pledgee to the payment of expenses incurred or paid by Pledgee in connection
with any sale, transfer or delivery of the collateral, to the payment of any
other costs, charges, attorneys' fees or expenses mentioned herein, and to the
payment of the indebtedness or any part hereof, all in such order and manner as
Pledgee in its discretion may determine. Pledgee shall pay any balance to the
undersigned.

         Pledgee shall be under no duty or obligation whatsoever to make or give
any presentments, demands for performance, notices of non-performance, protests,
notices of protest or notices of dishonor in connection with any obligations or
evidences of indebtedness held by Pledgee as collateral, or in connection with
any obligations or evidences of indebtedness which constitute in whole or in
part the indebtedness secured hereunder.

         Pledgee may at any time deliver the collateral or any part thereof to
the undersigned and the receipt of the undersigned shall be a complete and full
acquittance for the collateral so delivered, and Pledgee shall thereafter be
discharged from any liability or responsibility therefor.


                                       2.

<PAGE>   21

         Upon the transfer of all or any part of the indebtedness Pledgee may
transfer all or any part of the collateral and shall be fully discharged
thereafter from all liability and responsibility with respect to such collateral
so transferred, and the transferee shall be vested with all the rights and
powers of Pledgee hereunder with respect to such collateral so transferred; but
with respect to any collateral not so transferred Pledgee shall retain all
rights and powers hereby given.

         Until all indebtedness shall have been paid in full the power of sale
and all other rights, powers and remedies granted to Pledgee hereunder shall
continue to exist and may be exercised by Pledgee at any time and from time to
time irrespective of the fact that the indebtedness or any part thereof may have
become barred by any statute of limitations, or that the personal liability of
the undersigned may have ceased.

         Pledgee agrees that so long as the indebtedness is not in default,
shares of Landa Management Systems Corporation common stock held hereunder as
collateral for the indebtedness shall be released from pledge as the
indebtedness is paid. Such releases shall be at the rate of one share for each
$0.12 of principal amount of indebtedness paid. Release from pledge, however,
shall not result in release from the provisions of those certain Joint Escrow
Instructions, if any, of even date herewith among the parties to this Pledge
Agreement and the Escrow Agent named therein or from the Repurchase Option of
Landa Management Systems Corporation, set forth in the Stock Purchase Agreement
dated 17th March 1999, if any, between the parties to this Pledge Agreement.

         The rights, powers and remedies given to Pledgee by this agreement
shall be in addition to all rights, powers and remedies given to Pledgee by
virtue of any statute or rule of law. Pledgee may exercise its Pledgee's lien or
right of setoff with respect to the indebtedness in the same manner as if the
indebtedness were unsecured. Any forbearance or failure or delay by Pledgee in
exercising any right, power or remedy hereunder shall not be deemed to be a
waiver of such right, power or remedy, and any single or partial exercise of any
right, power or remedy hereunder shall not preclude the further exercise
thereof; and every right, power and remedy of Pledgee shall continue in full
force and effect until such right, power or remedy is specifically waived by an
instrument in writing executed by Pledgee.

          Dated: 17th March 1999

                                   /s/ EUGENE SANTA CATTARINA
                                   --------------------------------------------
                                   Eugene Santa Cattarina




ATTACHMENT: Schedule 1


                                       3.



<PAGE>   22





                                   SCHEDULE 1
                                       TO
                                PLEDGE AGREEMENT



    805,550 shares of Common Stock in Landa Management Systems Corporation.