Document:

<PAGE>   1
                                                                   EXHIBIT 10.11

                              AMENDED AND RESTATED
                 SECURED NONRECOURSE REVOLVING PROMISSORY NOTE

$1,783,898.73                                            Incline Village, Nevada
                                                                  April 30, 2000

     FOR VALUE RECEIVED, the undersigned, Collaboration Properties, Inc., a
Nevada corporation ("Borrower") promises to pay to the order of the Burnett
Revocable Trust ("Lender"), in lawful money of the United States of America and
in immediately available funds at the principal office of Lender, or its
successor, or at such other location as Lender, or any subsequent holder hereof
shall designate in writing, the aggregate unpaid principal amount of all
advances ("Advances") set forth on Exhibit A as well as all Advances made
hereafter by Lender to Borrower under the terms of this Secured Nonrecourse
Revolving Promissory Note (this "Note"), up to a maximum principal amount of One
Million Seven Hundred Eighty-Three Thousand Eight Hundred Ninety-Eight Dollars
and Seventy-Three Cents ($1,783,898.73) plus interest as set forth on Exhibit A.
This Note hereby amends and restates any loan agreements previously entered into
between Borrower and Lender and still outstanding as of the date hereof. This
Note shall also amend and restate and loan agreements previously entered into
between VCT, Inc., a Nevada corporation, which merged into Borrower as of April
21, 2000 ("VCT") and Lender. This Note evidences outstanding obligations and is
being issued in substitution for, and not in payment of, that certain Amended
and Restated Secured Nonrecourse Resolving Promissory Note dated November 18,
1999, as amended, made by Borrower in favor of Lender and [certain demand notes]
between VCT and Lender. Interest shall accrue on the aggregate unpaid principal
amount of such Advances at an interest rate equal to the lesser of 10% per annum
or the maximum rate allowed by law on the first business day of each month after
an Advance has been made and shall be payable annually in arrears; provided that
any interest not paid on any annual payment date shall be added to principal and
thereafter shall accrue interest along with the principal. Interest shall be
computed on a 365 day year based upon the actual number of days elapsed. The
entire principal amount and all accrued but unpaid interest shall be due and
payable upon the earlier of (i) three years from the date hereof; (ii) the date
of consummation of a transaction in which more than 50% of Borrower is not owned
by persons who were holders of capital stock or securities convertible into
capital stock of Borrower immediately prior to such transaction or in which the
composition of a majority of the Board of Directors of Borrower changes; or
(iii) 180 days following a firmly underwritten initial public offering of
Borrower at an aggregate offering price to the public of at least $5,000,000 and
with an offering price to the public of at least $2.50 per share. This Note
shall be terminated and canceled promptly upon Borrower's repayment of the
principal amount and all accrued but unpaid interest.

     This Note is subject to prepayment upon ninety (90) days written notice,
without penalty. Lender may waive this prepayment notice requirement in
Lender's sole and absolute discretion.

     Borrower represents and warrants that it is duly organized, legally
existing, in good standing and authorized to enter into this Note and that this
Note constitutes the legal, valid and binding obligation of Borrower.

     Borrower irrevocably waives the right to direct the application of any and
all payments at any time hereafter received by Lender from or on behalf of
Borrower, and Borrower irrevocably agrees that
<PAGE>   2
Lender shall have the continuing exclusive right to apply any and all such
payments against the then due and owing obligations of Borrower as Lender may
deem advisable. In the absence of a specific determination by Lender with
respect thereto, all payments shall be applied in the following order: (a) then
due and payable fees and expenses; (b) then due and payable interest payments
and mandatory prepayments; and (c) then due and payable principal payments and
optional prepayments.

     Lender is hereby authorized by Borrower to endorse on Lender's books and
records each Advance made by Lender under this Note and the amount of each
payment or prepayment of principal of each such Advance received by Lender. It
is understood, however, that failure to make any such endorsement (or any
errors in notation) shall not affect the obligations of Borrower with respect
to Advances made hereunder, and payments of principal and interest by Borrower
shall be credited to Borrower notwithstanding the failure to make a notation
(or any errors in notations) thereof on such books and records.

     If Borrower shall fail to do or to perform all things required of Borrower
in this Note within the time provided herein (such failure being an "Event of
Default"), Lender or any other holder of this Note, by negotiation, assignment
or otherwise, may, at Lender's sole option, accelerate the maturity of the Note
and the obligation evidenced hereby shall become due and payable in full upon
written notice of such acceleration to Borrower. The failure to pay interest on
any annual payment date shall not constitute an Event of Default hereunder, and
such accrued and unpaid interest shall be added to principal as set forth above.

     Borrower promises to pay Lender all reasonable costs and reasonable
expenses of collection of this Note and to pay all reasonable attorneys' fees
incurred in such collection or in any suit or action to collect this Note or in
any appeal thereof. Borrower waives presentment, demand, protest, notice of
protest, notice of dishonor, notice of nonpayment, and any and all other
notices and demands in connection with the delivery, acceptance, performance,
default or enforcement of this Note, as well as any applicable statute of
limitations. No delay by Lender in exercising any power or right hereunder
shall operate as a waiver of any power or right. Time is of the essence as to
all obligations hereunder.

     Payment of this Note is limited to payment out of the assets of Borrower
which secure the repayment of this Note, and no stockholder of Borrower shall
be personally liable for the payment of this Note.

     This Note shall be deemed to be made under, and shall be construed in
accordance with and governed by, the laws of the State of Nevada, excluding
conflicts of laws principles.

                                   COLLABORATION PROPERTIES, INC.

                                   By: /s/ [Signature Illegible]
                                       --------------------------

                                   Title: President and CEO
                                          -----------------------

<PAGE>   3

                                   EXHIBIT A

                     Schedule of Advances and Interest for
                 Secured Nonrecourse Revolving Promissory Note
                              As of April 30, 2000
<PAGE>   4
CPI Notes Payable
Consolidated Note effective 4/30/00

As of:                          04/30/00

<TABLE>
<CAPTION>
                                                          Principal         Total
          Note                   Date      Principal     Outstanding       Interest
                                Issued       Amount        04/30/00        04/30/00
<S>                            <C>       <C>            <C>             <C>
Burnett Revocable Trust(GJB)
       Total of Notes          03/31/00   1,783,898.73   1,783,898.73      102,860.83
       Interest calc           04/30/00           0.00           0.00       15,507.61

                                         $1,783,898.73  $1,783,898.73   $  118,368.44

                                         TOTAL PRINCIPAL + INTEREST =   $1,902,267.17
</TABLE>

                                                                  Page: 1 of: 1<PAGE>   1
                                                                   EXHIBIT 10.12

                              AMENDED AND RESTATED
                 SECURED NONRECOURSE REVOLVING PROMISSORY NOTE

$716,359.94                                              Incline Village, Nevada
                                                                  April 30, 2000

     FOR VALUE RECEIVED, the undersigned, Collaboration Properties, Inc., a
Nevada corporation ("Borrower") promises to pay to the order of the Heinrichs
Revocable Trust ("Lender"), in lawful money of the United States of America and
in immediately available funds at the principal office of Lender, or its
successor, or at such other location as Lender, or any subsequent holder hereof
shall designate in writing, the aggregate unpaid principal amount of all
advances ("Advances") set forth on Exhibit A as well as all Advances made
hereafter by Lender to Borrower under the terms of this Secured Nonrecourse
Revolving Promissory Note (this "Note"), up to a maximum principal amount of
Seven Hundred Sixteen Thousand Three Hundred Fifty-Nine Dollars and Ninety-Four
Cents ($716,359.94) plus interest as set forth on Exhibit A. This Note hereby
amends and restates any loan agreements previously entered into between Borrower
and Lender and still outstanding as of the date hereof. This Note shall also
amend and restate and loan agreements previously entered into between VCT, Inc.,
a Nevada corporation, which merged into Borrower as of April 21, 2000 ("VCT")
and Lender. This Note evidences outstanding obligations and is being issued in
substitution for, and not in payment of, that certain Amended and Restated
Secured Nonrecourse Revolving Promissory Note dated November 18, 1999, as
amended, made by Borrower in favor of Lender and [certain demand notes] between
VCT and Lender. Interest shall accrue on the aggregate unpaid principal amount
of such Advances at an interest rate equal to the lesser of 10% per annum or the
maximum rate allowed by law on the first business day of each month after an
Advance has been made and shall be payable annually in arrears; provided that
any interest not paid on any annual payment date shall be added to principal and
thereafter shall accrue interest along with the principal. Interest shall be
computed on a 365 day year based upon the actual number of days elapsed. The
entire principal amount and all accrued but unpaid interest shall be due and
payable upon the earlier of (i) three years from the date hereof; (ii) the date
of consummation of a transaction in which more than 50% of Borrower is not owned
by persons who were holders of capital stock or securities convertible into
capital stock of Borrower immediately prior to such transaction or in which the
composition of a majority of the Board of Directors of Borrower changes; or
(iii) 180 days following a firmly underwritten initial public offering of
Borrower at an aggregate offering price to the public of at least $5,000,000 and
with an offering price to the public of at least $2.50 per share. This Note
shall be terminated and canceled promptly upon Borrower's repayment of the
principal amount and all accrued but unpaid interest.

     This Note is subject to prepayment upon ninety (90) days written notice,
without penalty. Lender may waive this prepayment notice requirement in Lender's
sole and absolute discretion.

     Borrower represents and warrants that it is duly organized, legally
existing, in good standing and authorized to enter into this Note and that this
Note constitutes the legal, valid and binding obligation of Borrower.

     Borrower irrevocably waives the right to direct the application of any and
all payments at any time hereafter received by Lender from or on behalf of
Borrower, and Borrower irrevocably agrees that

<PAGE>   2
Lender shall have the continuing exclusive right to apply any and all such
payments against the then due and owing obligations of Borrower as Lender may
deem advisable. In the absence of a specific determination by Lender with
respect thereto, all payments shall be applied in the following order: (a) then
due and payable fees and expenses; (b) then due and payable interest payments
and mandatory prepayments; and (c) then due and payable principal payments and
optional prepayments.

     Lender is hereby authorized by Borrower to endorse on Lender's books and
records each Advance made by Lender under this Note and the amount of each
payment or prepayment of principal of each such Advance received by Lender. It
is understood, however, that failure to make any such endorsement (or any errors
in notation) shall not affect the obligations of Borrower with respect to
Advances made hereunder, and payments of principal and interest by Borrower
shall be credited to Borrower notwithstanding the failure to make a notation (or
any errors in notations) thereof on such books and records.

     If Borrower shall fail to do or to perform all things required of Borrower
in this Note within the time provided herein (such failure being an "Event of
Default"), Lender or any other holder of this Note, by negotiation, assignment
or otherwise, may, at Lender's sole option, accelerate the maturity of the Note
and the obligation evidenced hereby shall become due and payable in full upon
written notice of such acceleration to Borrower. The failure to pay interest on
any annual payment date shall not constitute an Event of Default hereunder, and
such accrued and unpaid interest shall be added to principal as set forth above.

     Borrower promises to pay Lender all reasonable costs and reasonable
expenses of collection of this Note and to pay all reasonable attorneys' fees
incurred in such collection or in any suit or action to collect this Note or in
any appeal thereof. Borrower waives presentment, demand, protest, notice of
protest, notice of dishonor, notice of nonpayment, and any and all other notices
and demands in connection with the delivery, acceptance, performance, default or
enforcement of this Note, as well as any applicable statute of limitations. No
delay by Lender in exercising any power or right hereunder shall operate as a
waiver of any power or right. Time is of the essence as to all obligations
hereunder.

     Payment of this Note is limited to payment out of the assets of Borrower
which secure the repayment of this Note, and no stockholder of Borrower shall be
personally liable for the payment of this Note.

     This Note shall be deemed to be made under, and shall be construed in
accordance with and governed by, the laws of the State of Nevada, excluding
conflicts of laws principles.

                                             COLLABORATION PROPERTIES, INC.

                                             By:  /s/ [SIGNATURE ILLEGIBLE]
                                                  ------------------------------
                                             Title: President and CEO
                                                   -----------------------------

<PAGE>   3

                                   EXHIBIT A

                     Schedule of Advances and Interest for
                 Secured Nonrecourse Revolving Promissory Note
                              As of April 30, 2000
<PAGE>   4
CPI Notes Payable
Consolidated Note effective 4/30/00

As of:                          04/30/00

<TABLE>
<CAPTION>
                                                          Principal         Total
          Note                   Date      Principal     Outstanding       Interest
                                Issued       Amount        04/30/00        04/30/00
<S>                            <C>       <C>            <C>             <C>
Heinrichs Revocable Trust (RSH)
       Total of Notes          03/31/00     716,359.94     716,359.94       41,023.96
       Interest calc           04/30/00           0.00           0.00        6,225.07

                                         $  716,359.94  $  716,359.94   $   47,249.03

                                         TOTAL PRINCIPAL + INTEREST =   $  763,608.97
</TABLE>

                                                                   Page: 1 of: 1

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