Document:

<PAGE>

                                                                     EXHIBIT 4.1

NEITHER  THIS  WARRANT NOR THE SHARES OF COMMON  STOCK  ISSUABLE  UPON  EXERCISE
HEREOF HAVE BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR ANY
APPLICABLE STATE SECURITIES LAW AND NEITHER MAY BE SOLD OR OTHERWISE TRANSFERRED
UNTIL (I) A REGISTRATION STATEMENT UNDER SUCH SECURITIES ACT AND SUCH APPLICABLE
STATE SECURITIES LAWS SHALL HAVE BECOME  EFFECTIVE WITH REGARD THERETO,  OR (II)
THE COMPANY SHALL HAVE RECEIVED A WRITTEN  OPINION OF COUNSEL  ACCEPTABLE TO THE
COMPANY TO THE EFFECT  THAT  REGISTRATION  UNDER  SUCH  SECURITIES  ACT AND SUCH
APPLICABLE  STATE  SECURITIES  LAWS IS NOT  REQUIRED  IN  CONNECTION  WITH  SUCH
PROPOSED TRANSFER.

                                    A21, INC.

                          COMMON STOCK PURCHASE WARRANT

 Original Issue Date:                                               SHARES
                      ----------                                    -------

         THIS CERTIFIES  THAT, FOR VALUE RECEIVED,  . or his registered  assigns
("HOLDER") is entitled to purchase, on the terms and conditions  hereinafter set
forth,  at any time or from time to time from the date  hereof  until 5:00 p.m.,
Eastern Time,  on the _______ (__)  anniversary  of the Original  Issue Date set
forth above,  or if such date is not a day on which the Company (as  hereinafter
defined) is open for business, then the next succeeding day on which the Company
is open for business (such date is the "EXPIRATION  DATE"),  but not thereafter,
to purchase up to _____________ (________) shares of the common stock, par value
$.001 per share (the "COMMON  STOCK"),  of A21, INC., a Texas  corporation  (the
"COMPANY"),  at $ PER SHARE (the  "EXERCISE  PRICE") as defined in Section  1(b)
below,  upon the terms and conditions set forth below, such number of shares and
Exercise  Price  being  subject  to  adjustment   upon  the  occurrence  of  the
contingencies set forth in this Warrant.  Each share of Common Stock as to which
this  Warrant  is  exercisable  is a  "WARRANT  SHARE"  and all such  shares are
collectively referred to as the "WARRANT SHARES." Capitalized terms used in this
Warrant but not  otherwise  defined  herein shall have the meanings  assigned to
such terms in the Securities Purchase Agreement.

         SECTION 1.        EXERCISE OF WARRANT; CONVERSION OF WARRANT.

                  (a) This Warrant may, at the option of Holder, be exercised in
whole or in part from time to time by  delivery  to the Company at its office at
One Embarcadero Center, Suite 500, San Francisco,  California 94111,  Attention:
President,  on or before 5:00 p.m.,  Eastern Time, on the Expiration Date, (i) a
written notice of such Holder's election to exercise this Warrant (the "EXERCISE
NOTICE"),  which notice shall be in the form of the Notice of Exercise  attached
hereto,  properly  executed  and  completed by Holder or an  authorized  officer
thereof, (ii) a check payable to the order of the Company, in an amount equal to
the product of the Exercise  Price  MULTIPLIED  BY the number of Warrant  Shares
specified in the Exercise Notice, AND (iii) this Warrant (the items specified in
(i), (ii), and (iii) are collectively the "EXERCISE MATERIALS").

                  (b)  Notwithstanding  anything else contained in this Warrant,
the exercise of this  Warrant and the  purchase of Warrant  Shares is subject to
the  following  restrictions:

     (i)  the Holder may purchase up to _____  Warrant  Shares at any time prior
          to the Expiration Date at $____ per share;

<PAGE>

                  (c) Upon  delivery of an Exercise  Notice to Company,  Company
shall execute or cause to be executed and  delivered to Holder a certificate  or
certificates representing the number of Warrant Shares specified in the Exercise
Notice,  together  with  cash in lieu of any  fraction  of a share,  and if this
Warrant  is  partially  exercised,  a new  warrant  on the  same  terms  for the
unexercised balance of the Warrant Shares. The stock certificate or certificates
shall be  registered  in the name of Holder or such other name or names as shall
be  designated  in the Exercise  Notice.  The date on which the Warrant shall be
deemed to have been exercised (the "EFFECTIVE DATE"), and the date the person in
whose name any certificate  evidencing the Common Stock issued upon the exercise
hereof is issued  shall be deemed to have  become  the  holder of record of such
shares,  shall  be  the  date  the  Company  receives  the  Exercise  Materials,
irrespective of the date of delivery of a certificate or certificates evidencing
the Common Stock issued upon the exercise hereof, PROVIDED, HOWEVER, that if the
Exercise  Materials  are  received  by the  Company on a date on which the stock
transfer  books of the Company are closed,  the Effective Date shall be the next
succeeding date on which the stock transfer books are open. All shares of Common
Stock  issued  upon the  exercise  or  conversion  of this  Warrant  will,  upon
issuance,  be fully paid and nonassessable  and free from all taxes,  liens, and
charges with respect thereto.

         SECTION 2.        ADJUSTMENTS  TO WARRANT  SHARES.  The number of
Warrant  Shares  issuable upon the exercise  hereof shall be subject to
adjustment as follows:

                  (a) In the event the  Company  is a party to a  consolidation,
         share exchange,  or merger,  or the sale of all or substantially all of
         the  assets  of the  Company  to,  any  person,  or in the  case of any
         consolidation  or merger of  another  corporation  into the  Company in
         which the Company is the surviving corporation, and in which there is a
         reclassification  or  change  of the  shares  of  Common  Stock  of the
         Company,  this Warrant shall after such consolidation,  share exchange,
         merger, or sale be exercisable for the kind and number of securities or
         amount and kind of property of the Company or the  corporation or other
         entity resulting from such share exchange, merger, or consolidation, or
         to which  such sale shall be made,  as the case may be (the  "SUCCESSOR
         COMPANY"),  to which a holder of the  number of shares of Common  Stock
         deliverable  upon the exercise  (immediately  prior to the time of such
         consolidation,  share exchange,  merger, or sale) of this Warrant would
         have been entitled upon such consolidation,  share exchange, merger, or
         sale; and in any such case appropriate adjustments shall be made in the
         application  of the  provisions  set forth  herein with  respect to the
         rights and  interests  of Holder,  such that the  provisions  set forth
         herein shall thereafter  correspondingly be made applicable,  as nearly
         as may  reasonably be, in relation to the number and kind of securities
         or the type and  amount of  property  thereafter  deliverable  upon the
         exercise of this Warrant. The above provisions shall similarly apply to
         successive  consolidations,  share exchanges,  mergers,  and sales. Any
         adjustment  required by this Section 2 (a) because of a  consolidation,
         share  exchange,  merger,  or sale shall be set forth in an undertaking
         delivered  to  Holder  and  executed  by the  Successor  Company  which
         provides  that Holder shall have the right to exercise this Warrant for
         the kind and number of securities or amount and kind of property of the
         Successor  Company  or to which  the  holder  of a number  of shares of
         Common Stock deliverable upon exercise  (immediately  prior to the time
         of such consolidation, share exchange, merger, or sale) of this Warrant
         would  have been  entitled  upon such  consolidation,  share  exchange,
         merger,  or sale.  Such  undertaking  shall  also  provide  for  future
         adjustments  to the number of Warrant  Shares and the Exercise Price in
         accordance with the provisions set forth in Section 2 hereof.

                  (b) In the event the Company  should at any time, or from time
         to time  after  the  Original  Issue  Date,  fix a record  date for the
         effectuation of a stock split or subdivision of the outstanding  shares
         of  Common  Stock or the  determination  of  holders  of  Common  Stock

<PAGE>

         entitled  to  receive  a  dividend  or other  distribution  payable  in
         additional shares of Common Stock, or securities or rights  convertible
         into,  or  entitling  the  holder   thereof  to  receive   directly  or
         indirectly,  additional shares of Common Stock (hereinafter referred to
         as "COMMON STOCK EQUIVALENTS")  without payment of any consideration by
         such  holder for the  additional  shares of Common  Stock or the Common
         Stock  Equivalents  (including  the  additional  shares of Common Stock
         issuable  upon exercise or exercise  thereof),  then, as of such record
         date (or the date of such dividend, distribution, split, or subdivision
         if no record date is fixed), the number of Warrant Shares issuable upon
         the exercise hereof shall be proportionately increased and the Exercise
         Price shall be  appropriately  decreased by the same  proportion as the
         increase in the number of outstanding  Common Stock  Equivalents of the
         Company   resulting  from  the  dividend,   distribution,   split,   or
         subdivision.  Notwithstanding  the  preceding  sentence,  no adjustment
         shall be made to decrease the Exercise Price below $.01 per Share.

                  (c) In the event the  Company  should at any time or from time
         to time  after  the  Original  Issue  Date,  fix a record  date for the
         effectuation  of a  reverse  stock  split,  or a  transaction  having a
         similar effect on the number of  outstanding  shares of Common Stock of
         the Company,  then, as of such record date (or the date of such reverse
         stock split or similar  transaction  if no record  date is fixed),  the
         number of Warrant  Shares  issuable  upon the exercise  hereof shall be
         proportionately decreased and the Exercise Price shall be appropriately
         increased  by the same  proportion  as the  decrease  of the  number of
         outstanding  Common Stock Equivalents  resulting from the reverse stock
         split or similar transaction.

                  (d) In the event the  Company  should at any time or from time
         to time  after  the  Original  Issue  Date,  fix a  record  date  for a
         reclassification  of its Common Stock, then, as of such record date (or
         the  date of the  reclassification  if no  record  date is  set),  this
         Warrant shall  thereafter be  convertible  into such number and kind of
         securities   as  would  have  been  issuable  as  the  result  of  such
         reclassification  to a holder of a number  of  shares  of Common  Stock
         equal to the number of Warrant  Shares  issuable  upon exercise of this
         Warrant  immediately prior to such  reclassification,  and the Exercise
         Price shall be unchanged.

                  (e) The Company will not, by amendment of its  Certificate  of
         Incorporation  or  through   reorganization,   consolidation,   merger,
         dissolution,  issue, or sale of securities, sale of assets or any other
         voluntary  action,  void or seek to avoid the observance or performance
         of any of the terms of the Warrant, but will at all times in good faith
         assist in the  carrying  out of all such terms and in the taking of all
         such actions as may be necessary or appropriate in order to protect the
         rights of Holder against dilution or other impairment. Without limiting
         the generality of the foregoing,  the Company (x) will not create a par
         value of any share of stock receivable upon the exercise of the Warrant
         above the amount payable therefor upon such exercise, and (y) will take
         all such action as may be  necessary or  appropriate  in order that the
         Company may validly  and  legally  issue fully paid and  non-assessable
         shares upon the exercise of the Warrant.

                  (f) When any  adjustment  is required to be made in the number
         or kind of shares  purchasable upon exercise of the Warrant,  or in the
         Exercise Price,  the Company shall promptly notify Holder of such event
         and of the  number of shares of  Common  Stock or other  securities  or
         property  thereafter  purchasable  upon exercise of the Warrants and of
         the Exercise  Price,  together with the  computation  resulting in such
         adjustment.

                  (g) The Company  covenants and agrees that all Warrant  Shares
         which may be issued will, upon issuance, be validly issued, fully paid,
         and  non-assessable.  The Company further covenants and agrees that the
         Company  will at all times  have  authorized  and  reserved,  free from
         preemptive rights, a sufficient number of shares of its Common Stock to
         provide for the exercise of the Warrant in full.
<PAGE>

         SECTION 3.        NO  STOCKHOLDER  RIGHTS.  This Warrant shall not
entitle  Holder hereof to any voting rights or other rights as a stockholder of
the Company.

         SECTION 4.        TRANSFER OF SECURITIES.

                  (a) This  Warrant  and the  Warrant  Shares  and any shares of
         capital stock received in respect thereof, whether by reason of a stock
         split or share  reclassification  thereof, a stock dividend thereon, or
         otherwise,  shall not be  transferable  except upon compliance with the
         provisions of the Securities  Act of 1933, as amended (the  "SECURITIES
         ACT") and applicable state securities laws with respect to the transfer
         of such securities.  The Holder, by acceptance of this Warrant,  agrees
         to be bound by the  provisions of Section 4 hereof and to indemnify and
         hold  harmless the Company  against any loss or liability  arising from
         the  disposition  of this Warrant or the Warrant  Shares  issuable upon
         exercise  hereof or any interest in either  thereof in violation of the
         provisions of this Warrant.

         (b) Each  certificate  for the Warrant Shares and any shares of capital
         stock received in respect  thereof,  whether by reason of a stock split
         or  share  reclassification   thereof,  a  stock  dividend  thereon  or
         otherwise,  and each  certificate  for any such  securities  issued  to
         subsequent  transferees of any such certificate shall (unless otherwise
         permitted by the provisions  hereof) be stamped or otherwise  imprinted
         with a legend in substantially the following form:

         "NEITHER  THIS  WARRANT NOR THE SHARES OF COMMON  STOCK  ISSUABLE  UPON
         EXERCISE HEREOF HAVE BEEN REGISTERED  UNDER THE SECURITIES ACT OF 1933,
         AS AMENDED,  OR ANY APPLICABLE  STATE SECURITIES LAW AND NEITHER MAY BE
         SOLD OR OTHERWISE TRANSFERRED UNTIL (I) A REGISTRATION  STATEMENT UNDER
         SUCH  SECURITIES ACT AND SUCH  APPLICABLE  STATE  SECURITIES LAWS SHALL
         HAVE BECOME  EFFECTIVE WITH REGARD  THERETO,  OR (II) THE COMPANY SHALL
         HAVE RECEIVED A WRITTEN OPINION OF COUNSEL ACCEPTABLE TO THE COMPANY TO
         THE  EFFECT  THAT  REGISTRATION  UNDER  SUCH  SECURITIES  ACT AND  SUCH
         APPLICABLE  STATE  SECURITIES  LAWS IS NOT REQUIRED IN CONNECTION  WITH
         SUCH PROPOSED TRANSFER."

         SECTION 5.        REGISTRATION.

         All  Warrant  Shares  are  subject  to  the  registration   rights  and
privileges  granted  in  and  under  the  Purchase  Agreement,   as  Registrable
Securities (as such term is defined in such Purchase Agreement).

         SECTION 6.        MISCELLANEOUS.

                  (a) The terms of this Warrant  shall be binding upon and shall
inure to the benefit of any  successors or permitted  assigns of the Company and
Holder.

                  (b) Except as otherwise provided herein,  this Warrant and all
rights hereunder are  transferable by the registered  holder hereof in person or
by duly  authorized  attorney on the books of the Company upon surrender of this
Warrant,  properly endorsed,  to the Company. The Company may deem and treat the
registered  holder of this Warrant at any time as the absolute  owner hereof for
all purposes and shall not be affected by any notice to the contrary.

                  (c)  Notwithstanding  any  provision  herein to the  contrary,
Holder may not exercise, sell, transfer, or otherwise assign this Warrant unless
the  Company is  provided  with an opinion of counsel  satisfactory  in form and
substance to the Company, to the effect that such exercise,  sale, transfer,  or
assignment  would not violate the Securities Act or applicable  state securities
laws.
<PAGE>

                  (d)  This  Warrant  may  be  divided  into  separate  warrants
covering one share of Common Stock or any whole multiple thereof,  for the total
number of shares of Common Stock then  subject to this  Warrant at any time,  or
from time to time, upon the request of the registered holder of this Warrant and
the  surrender  of the same to the Company  for such  purpose.  Such  subdivided
Warrants shall be issued promptly by the Company  following any such request and
shall be of the same form and tenor as this  Warrant,  except for any  requested
change in the name of the registered holder stated herein.

                  (e) Any notices,  consents,  waivers, or other  communications
required or  permitted  to be given under the terms of this  Warrant  must be in
writing  and will be  deemed  to have  been  delivered  (a) upon  receipt,  when
delivered personally, (b) upon receipt, when sent by facsimile,  PROVIDED a copy
is mailed by U.S. certified mail, return receipt  requested,  (c) three (3) days
after being sent by U.S.  certified mail, return receipt  requested,  or (d) one
(1) day after deposit with a nationally  recognized  overnight delivery service,
in each case properly  addressed to the party to receive the same. The addresses
and facsimile numbers for such communications shall be:

                            If to Company:  a21, Inc.
                                            One Embarcadero Center, Suite 500
                                            San Francisco, CA  94111
                                            415.284.5035

                              Attention:    President

         If to Holder,  to the  registered  address of Holder  appearing  on the
books of the  Company.  Each party  shall  provide  five (5) days prior  written
notice to the other party of any change in address,  which  change  shall not be
effective until actual receipt thereof

                  (f) The corporate  laws of the State of Texas shall govern all
issues concerning the relative rights of the Company and its  stockholders.  All
other  questions   concerning  the  construction,   validity,   enforcement  and
interpretation  of this Warrant  shall be governed by the  internal  laws of the
State of New York, without giving effect to any choice of law or conflict of law
provision or rule (whether of the State of New York or any other  jurisdictions)
that would cause the application of the laws of any jurisdictions other than the
State of New York. Each party hereby  irrevocably  submits to the  non-exclusive
jurisdiction  of the  state and  federal  courts  sitting  the City of New York,
borough of  Manhattan,  for the  adjudication  of any  dispute  hereunder  or in
connection  herewith or with any  transaction  contemplated  hereby or discussed
herein,  and hereby  irrevocably  waives,  and agrees not to assert in any suit,

<PAGE>

action  or  proceeding,  any  claim  that it is not  personally  subject  to the
jurisdiction of any such court,  that such suit, action or proceeding is brought
in an inconvenient forum or that the venue of such suit, action or proceeding is
improper.  Each party hereby  irrevocably waives personal service of process and
consents  to process  being  served in any such suit,  action or  proceeding  by
mailing a copy thereof to such party at the address for such notices to it under
this Warrant and agrees that such service shall  constitute  good and sufficient
service of process and notice thereof.  Nothing contained herein shall be deemed
to limit in any way any right to serve  process in any manner  permitted by law.
If any  provision  of this  Warrant  shall be  invalid or  unenforceable  in any
jurisdiction,  such invalidity or unenforceability shall not affect the validity
or  enforceability  of the remainder of this Warrant in that jurisdiction or the
validity  or  enforceability  of any  provision  of this  Warrant  in any  other
jurisdiction.

                       [Signatures on the following page]

<PAGE>

                                 SIGNATURE PAGE
                                       TO
                                     COMPANY
                          COMMON STOCK PURCHASE WARRANT

         IN WITNESS WHEREOF, the Company, has caused this Warrant to be executed
in its name by its duly  authorized  officers  under seal, and to be dated as of
the date first above written.

                                    A21, INC.

                                          By:
                                              --------------------------------
                                              Name: Albert H. Pleus
                                              Title:    Chairman
ATTEST:

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

<PAGE>

ASSIGNMENT

         (To be Executed by the Registered Holder to effect a Transfer of the
foregoing Warrant)

         FOR VALUE  RECEIVED,  the  undersigned  hereby  sells,  and assigns and
transfers unto  ______________________________________the  foregoing Warrant and
the rights  represented  thereto to purchase shares of Common Stock of A21, INC.
in accordance  with terms and conditions  thereof,  and does hereby  irrevocably
constitute and appoint ____________________________________ Attorney to transfer
the said Warrant on the books of the Company, with full power of substitution.

         Holder:

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

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

         Address

         Dated: __________________, 20__

         In the presence of:

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

<PAGE>

EXERCISE NOTICE

         [To be signed only upon exercise of Warrant]

To:      A21, INC.

         The  undersigned  Holder of the  attached  Warrant  hereby  irrevocably
elects   to   exercise   the   Warrant   for,   and  to   purchase   thereunder,
__________________  shares of Common Stock of A21, INC.,  issuable upon exercise
of said Warrant and hereby surrenders said Warrant.

         The Holder  herewith  delivers to A21,  INC.,  a check in the amount of
$_______________ representing the Exercise Price for such shares.

         The undersigned herewith requests that the certificates for such shares
be issued in the name of, and  delivered to the  undersigned,  whose  address is
________________________________.

If electronic book entry transfer, complete the following:

         Account Number:
                           -----------------------------------

         Transaction Code Number:
                                   ------------------

Dated: ___________________

                                     Holder:

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

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

                                      By:
                                             -----------------------------------
                                              Name:
                                              Title:

NOTICE

         The  signature  above must  correspond  to the name as written upon the
face  of  the  within  Warrant  in  every  particular,   without  alteration  or
enlargement or any change whatsoever.

<PAGE><PAGE>
                                                                     EXHIBIT 4.2

                                 PROMISSORY NOTE
                                 ---------------

$                                                  DATE:  DECEMBER  31,  2002
-----------                                              -------------------

FOR  VALUE  RECEIVED a21, Inc. ("a21" or the undersigned) promises to pay to the
order  of  _____________________, or at such other place in the United States of
America  as  the  holder hereof may designate in writing to the undersigned, the
sum  of _________________DOLLARS plus interest from the date hereof, at the rate
                         -------
of  twelve  percent (12.0%) per annum.  Principal and interest shall be due June
30,  2003,  in  its entirety unless the loan is extended as per mutual agreement
between  the  parties.

The holder hereof may, without notice and without releasing any liability of any
party  hereto, grant extensions or renewals hereof from time to time and for any
term  or  terms,  add  or  release any security in whole or in part.  The holder
hereof  shall  not be liable for or prejudiced by failure to collect or for lack
of  diligence  in bringing suit on this note or any renewal or extension hereof.

The  undersigned  and  any and all other parties hereto waive protest, notice to
protect  and  notice  of  dishonor, and agree that in the event of a default, if
this  note  is  placed in the hands of an attorney for collection, they will pay
all  reasonable attorneys' fees, together with any and all court costs incurred.
The  laws  of  the  State  of  New  York  shall  govern.

               ______________________________
               By:  Haim  Ariav,  President
               a21,  Inc.

                                      -1-

<PAGE>

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00052-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00052-of-00352.parquet"}]]