Document:

EXHIBIT 4.12

                          REGISTRATION RIGHTS AGREEMENT

         REGISTRATION RIGHTS AGREEMENT, dated as of February __, 2000 (this
"AGREEMENT"), is made by and among ADATOM.COM, INC., a Delaware corporation,
with headquarters located at 920 Hillview Court, Milpitas, CA 95035 (the
"COMPANY"), and the investor named on the signature page hereto (the
"SUBSCRIBER").

                                    RECITALS

         A. The Company is offering up to 2,000,000 Common Shares (subject to
the Company's right to increase the offering in its sole discretion by an
additional 400,000 Common Shares) to investors at $2.00 per share in a private
placement offering that commenced on February 11, 2000 and shall terminate on
the earlier of the date on which all such Common Shares have been sold and March
3, 2000, subject to earlier termination or extension in the sole discretion of
the Company. Under a Securities Purchase Agreement dated February __, 2000,
between the Subscriber and the Company, the Company has agreed, upon the terms
and subject to the conditions of the Purchase Agreement, to issue and sell to
the Subscriber shares of the Company's Common Stock (the "COMMON SHARES").
Subscribers for additional Common Shares offered in this offering also shall
execute and deliver a securities purchase agreement on terms and conditions and
in the form of the securities purchase agreement executed and delivered by the
Subscriber (each such securities purchase agreement, including that executed and
delivered by the Subscriber, a "Purchase Agreement"). THE COMPANY HAS THE RIGHT
TO REJECT ANY SUBSCRIPTION FOR SECURITIES, IN WHOLE OR IN PART FOR ANY REASON
AND AT ANY TIME PRIOR TO A CLOSING, NOTWITHSTANDING RECEIPT BY THE SUBSCRIBER OR
ANY OTHER INVESTOR OF NOTICE OF ACCEPTANCE OF A SUBSCRIPTION.

         B. In order to induce the Subscriber to execute and deliver a Purchase
Agreement, the Company has agreed to provide certain registration rights under
the Securities Act and applicable state securities laws with respect to the
Common Shares.

         In consideration of the premises and the mutual covenants contained
herein and other good and valuable consideration, the receipt and sufficiency of
which are hereby acknowledged, the Company and the Subscriber hereby agree as
follows:

                                    ARTICLE I

                                   DEFINITIONS

         Capitalized terms used and not otherwise defined herein have the
respective meanings given them set forth in the Purchase Agreement. In addition,
as used in this Agreement, the following terms have the following meanings:

         1.1 "COMMON SHARES" means the shares of Common Stock sold pursuant to a
Purchase Agreement.

         1.2 :INITIAL INVESTORS" shall mean the subscribers who are parties to a
Purchase Agreement and a related registration rights agreement in the form of
this Agreement, whose subscriptions are accepted at a Closing.

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         1.3 "INVESTORS" means the Initial Investors and any of their
transferees or assignees that agree to become bound by the provisions of this
Agreement in accordance with Article IX hereof.

         1.4 "REGISTRABLE SECURITIES" means the Common Shares sold pursuant to
the Purchase Agreement and any shares of capital stock issued or issuable from
time to time (with any adjustments) in exchange for or otherwise with respect to
the Common Shares.

         1.5 "REGISTRATION PERIOD" means the period between the date of this
Agreement and the earlier of (i) the date on which all of the Registrable
Securities have been sold and no further Registrable Securities may be issued in
the future, (ii) the date on which all the Registrable Securities (in the
opinion of the Investors' counsel) may be immediately sold without registration
and without restriction (including without limitation as to volume by each
holder thereof) as to the number of Registrable Securities to be sold, pursuant
to Rule 144 or otherwise, or (iii) the second anniversary of the date of this
Agreement.

         1.6 "REGISTRATION STATEMENT" means a Registration Statement of the
Company filed under the Securities Act

         1.7 The terms "REGISTER," "REGISTERED," and "REGISTRATION" refer to a
registration effected by preparing and filing a Registration Statement or
statements in compliance with the Securities Act and pursuant to Rule 415 and
the declaration or ordering of effectiveness of such Registration Statement by
the SEC.

         1.8 "RULE 415" means Rule 415 under the Securities Act, or any
successor Rule providing for offering securities on a continuous basis, and
applicable rules and regulations thereunder.

                                   ARTICLE II

                                  REGISTRATION

         2.1 MANDATORY REGISTRATION. The Company will use best efforts to file
with the SEC a Registration Statement on Form S-3 registering the Registrable
Securities and no other securities for resale within 60 days after the Initial
Closing Date of the purchase of the Common Shares under the Purchase Agreement.
If Form S-3 is not available at that time, then the Company will file a
Registration Statement on such form as is then available to effect a
registration of the Registrable Securities, subject to the consent of the
Initial Investors, which consent will not be unreasonably withheld.

         2.2 EFFECTIVENESS OF THE REGISTRATION STATEMENT. The Company will use
its best efforts to cause the Registration Statement to be declared effective by
the SEC within 90 days after filing or if the SEC reviews the Registration
Statement within 120 days after filing. The Company's best efforts will include,
but is not limited to, promptly responding to all comments received from the
staff of the SEC. If the Company receives notification from the SEC that the
Registration Statement will receive no action or review from the SEC, then the
Company will cause the Registration Statement to become effective within five
business days after such SEC notification. Once the Registration Statement is
declared effective by the SEC, the Company will cause the Registration Statement
to remain effective throughout the Registration Period, except as permitted
under Section 3.

         2.3 PIGGYBACK REGISTRATIONS. (a) If, at any time prior to the
expiration of the Registration Period, a Registration Statement is not effective
with respect to all of the Registrable Securities and the Company decides to
register any of its securities for its own account or for the account of others,
then the Company will promptly give the Investors written notice thereof and
will use its best efforts to include in such registration all or any part of the
Registrable Securities requested by such Investors to be

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included therein (excluding any Registrable Securities previously included in a
Registration Statement). This requirement does not apply to Company
registrations on Form S-4 or S-8 or their equivalents relating to equity
securities to be issued solely in connection with an acquisition of any entity
or business or equity securities issuable in connection with stock option or
other employee benefit plans. Each Investor must give its request for
registration under this paragraph to the Company in writing within 15 days after
receipt from the Company of notice of such pending registration. If the
registration for which the Company gives notice is a public offering involving
an underwriting, the Company will so advise the Investors as part of the
above-described written notice. In that event, if the managing underwriter(s) of
the public offering impose a limitation on the number of shares of Common Stock
that may be included in the Registration Statement because, in such
underwriter(s)' judgment, such limitation would be necessary to effect an
orderly public distribution, then the Company will be obligated to include only
such limited portion, if any, of the Registrable Securities with respect to
which such Investors have requested inclusion hereunder. Any exclusion of
Registrable Securities will be made pro rata among all holders of the Company's
securities seeking to include shares of Common Stock in proportion to the number
of shares of Common Stock sought to be included by those holders. However, the
Company will not exclude any Registrable Securities unless the Company has first
excluded all outstanding securities the holders of which are not entitled by
right to inclusion of securities in such Registration Statement or are not
entitled pro rata inclusion with the Registrable Securities.

                  (b) No right to registration of Registrable Securities under
this Section 2.3 limits in any way the registration required under Section 2.1
above. The obligations of the Company under this Section 2.3 expire upon the
earlier of (i) the effectiveness of the Registration Statement filed pursuant to
Section 2.1 above, (ii) after the Company has afforded the opportunity for the
Investors to exercise registration rights under this Section 2.3 for two
registrations (provided, however, that any Investor that has had any Registrable
Securities excluded from any Registration Statement in accordance with this
Section 2.3 may include in any additional Registration Statement filed by the
Company the Registrable Securities so excluded), (iii) when all of the
Registrable Securities held by any Investor may be sold by such Investor under
Rule 144 without being subject to any volume restrictions, or (iv) the second
anniversary of the date of this Agreement.

         2.4 ELIGIBILITY TO USE FORM S-3. The Company represents and warrants
that it currently meets the requirements for the use of Form S-3 for
registration of the sale by the Investors of the Registrable Securities. The
Company will use its best efforts to file all reports required to be filed by
the Company with the SEC in a timely manner so as to preserve its eligibility
for the use of Form S-3.

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                                   ARTICLE III
                      ADDITIONAL OBLIGATIONS OF THE COMPANY

         3.1 CONTINUED EFFECTIVENESS OF REGISTRATION STATEMENT. Subject to the
limitations set forth in Section 3.6, the Company will use its best efforts to
keep the Registration Statement covering the Registrable Securities effective
under Rule 415 at all times during the Registration Period.

         3.2 ACCURACY OF REGISTRATION STATEMENT. Any Registration Statement
(including any amendments or supplements thereto and prospectuses contained
therein) filed by the Company covering Registrable Securities will not contain
any untrue statement of a material fact or omit to state a material fact
required to be stated therein, or necessary to make the statements therein, in
light of the circumstances in which they were made, not misleading. The Company
will prepare and file with the SEC such amendments (including post-effective
amendments) and supplements to the Registration Statement and the prospectus
used in connection with the Registration Statement as may be necessary to permit
sales pursuant to the Registration Statement at all times during the
Registration Period, and, during such period, will comply with the provisions of
the Securities Act with respect to the disposition of all Registrable Securities
of the Company covered by the Registration Statement until the termination of
the Registration Period, or if earlier, until such time as all of such
Registrable Securities have been disposed of in accordance with the intended
methods of disposition by the seller or sellers thereof as set forth in the
Registration Statement.

         3.3 FURNISHING DOCUMENTATION. The Company will furnish to each Investor
whose Registrable Securities are included in a Registration Statement, and to
its legal counsel, (a) promptly after each document is prepared and publicly
distributed, filed with the SEC or received by the Company, one copy of any
Registration Statement filed pursuant to this Agreement and any amendments
thereto, each preliminary prospectus and final prospectus and each amendment or
supplement thereto; and, in the case of a Registration Statement filed under
Section 2.1 above, each letter written by or on behalf of the Company to the SEC
and each item of correspondence from the SEC or the staff of the SEC, in each
case relating to such Registration Statement (other than any portion of any item
thereof which contains information for which the Company has sought confidential
treatment); and (b) a number of copies of a prospectus, including a preliminary
prospectus, and all amendments and supplements thereto, and such other documents
as the Investor may reasonably request in order to facilitate the disposition of
the Registrable Securities owned by the Investor. The Company will immediately
notify by facsimile each Investor whose Registrable Securities are included in
any Registration Statement of the effectiveness of the Registration Statement
and any post-effective amendment.

         3.4 ADDITIONAL OBLIGATIONS. The Company will use its best efforts to
(a) register and qualify the Registrable Securities covered by a Registration
Statement under such other securities or blue sky laws of such jurisdictions as
each Investor who holds (or has the right to hold) Registrable Securities being
offered reasonably requests, (b) prepare and file in those jurisdictions any
amendments (including post-effective amendments) and supplements to such
registrations and qualifications as may be necessary to maintain their
effectiveness during the Registration Period, (c) take any other actions
necessary to maintain such registrations and qualifications in effect at all
times during the Registration Period, and (d) take any other actions reasonably
necessary or advisable to qualify the Registrable Securities for sale in such
jurisdictions. Notwithstanding the foregoing, the Company is not required, in
connection such obligations, to (i) qualify to do business in any jurisdiction
where it would not otherwise be required to qualify but for this

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Section 3.4, (ii) subject itself to general taxation in any such jurisdiction,
(iii) file a general consent to service of process in any such jurisdiction,
(iv) provide any undertakings that cause material expense or burden to the
Company, or (v) make any change in its charter or bylaws, which in each case the
Board of Directors of the Company determines to be contrary to the best
interests of the Company and its stockholders.

         3.5 UNDERWRITTEN OFFERINGS. If the Investors who hold a majority in
interest of the Registrable Securities being offered in an offering pursuant to
a Registration Statement or any amendment or supplement thereto under this
Agreement select underwriters reasonably acceptable to the Company for such
offering, the Company will enter into and perform its obligations under an
underwriting agreement in usual and customary form including, without
limitation, customary indemnification and contribution obligations, with the
managing underwriter of such offering.

         3.6 SUSPENSION OF REGISTRATION. (a) The Company will notify (by
telephone and also by facsimile and reputable overnight courier) each Investor
who holds Registrable Securities being sold pursuant to a Registration Statement
of the happening of any event of which the Company has knowledge as a result of
which the prospectus included in the Registration Statement as then in effect
includes an untrue statement of a material fact or omits to state a material
fact required to be stated therein or necessary to make the statements therein,
in light of the circumstances under which they were made, not misleading. The
Company will make such notification as promptly as practicable after the Company
becomes aware of the event (but in no event, without the prior written consent
of the Investor, will the Company disclose to any Investor any of the facts or
circumstances regarding the event), will promptly (but in no event more than ten
business days) prepare a supplement or amendment to the Registration Statement
to correct such untrue statement or omission, and will deliver a number of
copies of such supplement or amendment to each Investor as such Investor may
reasonably request.

                  (b) Notwithstanding the obligations under Section 3.6(a), if
in the good faith judgment of the Company, following consultation with legal
counsel, resales of Registrable Securities made pursuant to the Registration
Statement (i) would be detrimental to the Company and its stockholders due to
the existence of a material development or potential material development
involving the Company which the Company would be obligated to disclose in the
Registration Statement, which disclosure would be premature or otherwise
inadvisable at such time or would have a Material Adverse Effect upon the
Company and its stockholders, or (ii) would adversely affect or require
premature disclosure of the filing of a Company-initiated registration of any
class of its equity securities, the Company will have the right to suspend the
use of the Registration Statement for a period of not more than sixty days,
PROVIDED, HOWEVER, that the Company may so defer or suspend the use of the
Registration Statement no more than one time in any twelve-month period, and
PROVIDED, FURTHER, that, after deferring or suspending the use of the
Registration Statement, the Company may not again defer or suspend the use of
the Registration Statement until a period of thirty days has elapsed after
resumption of the use of the Registration Statement.

                  (c) Subject to the Company's rights under this Section 3, the
Company will use its best efforts to prevent the issuance of any stop order or
other suspension of effectiveness of a Registration Statement and, if such an
order is issued, will use its best efforts to obtain the withdrawal of such
order at the earliest possible time and to notify each Investor that holds
Registrable Securities being sold (or, in the event of an underwritten offering,
the managing underwriters) of the issuance of such order and the resolution
thereof.

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                  (d) Notwithstanding anything to the contrary contained herein
or in the Purchase Agreement, if the use of the Registration Statement is
suspended by the Company, the Company will promptly give notice of the
suspension to all Investors whose securities are covered by the Registration
Statement, and will promptly notify each such Investor as soon as the use of the
Registration Statement may be resumed. Notwithstanding anything to the contrary
contained herein or in the Purchase Agreement, the Company will cause the
Transfer Agent to deliver unlegended shares of Common Stock to a transferee of
an Investor in accordance with the terms of the Purchase Agreement in connection
with any sale of Registrable Securities with respect to which such Investor has
entered into a contract for sale prior to receipt of notice of such suspension
and for which such Investor has not yet settled

         3.7 INFORMATION. The Company will make generally available to its
security holders as soon as practicable, but not later than 90 days after the
close of the period covered thereby, an earnings statement (in a form complying
with the provisions of Rule 158 under the Securities Act) covering a 12-month
period beginning not later than the first day of the Company's fiscal quarter
next following the effective date of the Registration Statement.

         3.8 LISTING. The Company will (i) cause all of the Registrable
Securities covered by each Registration Statement to be listed on each national
securities exchange on which securities of the same class or series issued by
the Company are then listed, if any, if the listing of such Registrable
Securities is then permitted under the rules of such exchange, or (ii) to the
extent the securities of the same class or series are not then listed on a
national securities exchange, secure the designation and quotation of all of the
Registrable Securities covered by each Registration Statement on Nasdaq.

         3.9 TRANSFER AGENT; REGISTRAR. The Company will provide a transfer
agent and registrar, which may be a single entity, for the Registrable
Securities not later than the effective date of the Registration Statement.

         3.10 SHARE CERTIFICATES. The Company will cooperate with the Investors
who hold Registrable Securities being sold and with the managing underwriter(s),
if any, to facilitate the timely preparation and delivery of certificates (not
bearing any restrictive legends) representing Registrable Securities to be
offered pursuant to a Registration Statement and will enable such certificates
to be in such denominations or amounts as the case may be, and registered in
such names as the Investors or the managing underwriter(s), if any, may
reasonably request, all in accordance with Article V of the Purchase Agreement.

         3.11 PLAN OF DISTRIBUTION. At the request of the Investors holding a
majority in interest of the Registrable Securities registered pursuant to a
Registration Statement, the Company will promptly prepare and file with the SEC
such amendments (including post-effective amendments) and supplements to the
Registration Statement, and the prospectus used in connection with the
Registration Statement, as may be necessary in order to change the plan of
distribution set forth in such Registration Statement.

         3.12 SECURITIES LAWS COMPLIANCE. The Company will comply with all
applicable laws related to any Registration Statement relating to the sale of
Registrable Securities and to offering and sale of securities and with all
applicable rules and regulations of governmental authorities in connection
therewith (including, without limitation, the Securities Act, the Exchange Act
and the rules and regulations promulgated by the SEC).

         3.13 FURTHER ASSURANCES. The Company will take all other reasonable
actions as any Investor or the underwriters, if any, may reasonably request to
expedite and facilitate disposition by such Investor of the Registrable
Securities pursuant to the Registration Statement.

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                                   ARTICLE IV
                          OBLIGATIONS OF THE INVESTORS

         4.1 INVESTOR INFORMATION. As a condition to the obligations of the
Company to complete any registration pursuant to this Agreement with respect to
the Registrable Securities of each Investor, such Investor will furnish to the
Company such information regarding itself, the Registrable Securities held by it
and the intended method of disposition of the Registrable Securities held by it
as is reasonably required by the Company to effect the registration of the
Registrable Securities. At least 10 business days prior to the first anticipated
filing date of a Registration Statement for any registration under this
Agreement, the Company will notify each Investor of the information the Company
requires from that Investor if the Investor elects to have any of its
Registrable Securities included in the Registration Statement. If, within three
business days prior to the filing date, the Company has not received the
requested information from an Investor, then the Company may file the
Registration Statement without including Registrable Securities of that
Investor.

         4.2 FURTHER ASSURANCES. Each Investor will cooperate with the Company,
as reasonably requested by the Company, in connection with the preparation and
filing of any Registration Statement hereunder, unless such Investor has
notified the Company in writing of such Investor's election to exclude all of
such Investor's Registrable Securities from the Registration Statement.

         4.3 SUSPENSION OF SALES. Upon receipt of any notice from the Company of
the happening of any event of the kind described in Section 3.6, each Investor
will immediately discontinue disposition of Registrable Securities pursuant to
the Registration Statement covering such Registrable Securities until it
receives copies of the supplemented or amended prospectus contemplated by
Section 3.6. If so directed by the Company, each Investor will deliver to the
Company (at the expense of the Company) or destroy (and deliver to the Company a
certificate of destruction) all copies in the Investor's possession (other than
a limited number of file copies) of the prospectus covering such Registrable
Securities that is current at the time of receipt of such notice.

         4.4 UNDERWRITTEN OFFERINGS. (a) If Investors holding a majority in
interest of the Registrable Securities being registered determine to engage the
services of an underwriter, each Investor will enter into and perform such
Investor's obligations under an underwriting agreement, in usual and customary
form, including, without limitation, customary indemnification and contribution
obligations, with the managing underwriter of such offering, and will take such
other actions as are reasonably required in order to expedite or facilitate the
disposition of the Registrable Securities, unless such Investor has notified the
Company in writing of such Investor's election to exclude all of its Registrable
Securities from such Registration Statement.

                  (b) Without limiting any Investor's rights under Section 2.1
hereof, no Investor may participate in any underwritten distribution hereunder
unless such Investor (a) agrees to sell such Investor's Registrable Securities
on the basis provided in any underwriting arrangements approved by the Investors
entitled hereunder to approve such arrangements, (b) completes and executes all
questionnaires, powers of attorney, indemnities, underwriting agreements and
other documents reasonably required under the terms of such underwriting
arrangements, and (c) agrees to pay its pro rata share of all underwriting
discounts and commissions and other fees and expenses of investment bankers and
any manager or managers of such underwriting, and legal expenses of the
underwriter, applicable with respect to its Registrable Securities, in each case
to the extent not payable by the Company under the terms of this Agreement.

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                                    ARTICLE V
                            EXPENSES OF REGISTRATION

         The Company will bear all reasonable expenses, other than underwriting
discounts and commissions, transfer taxes, if any, and legal fees and
disbursements of legal counsel to the Investors, incurred in connection with
registrations, filings or qualifications pursuant to Articles II and III of this
Agreement, including, without limitation, all registration, listing and
qualifications fees, printers and accounting fees, the fees and disbursements of
counsel for the Company.

                                   ARTICLE VI

                                 INDEMNIFICATION

         In the event that any Registrable Securities are included in a
Registration Statement under this Agreement:

         6.1 To the extent permitted by law, the Company will indemnify and hold
harmless each Investor that holds such Registrable Securities, any underwriter
(as defined in the Securities Act) for the Investors, any directors or officers
of such Investor or such underwriter and any person who controls such Investor
or such underwriter within the meaning of the Securities Act or the Exchange Act
(each, an "INDEMNIFIED PERSON") against any losses, claims, damages, expenses or
liabilities (joint or several) (collectively, and together with actions,
proceedings or inquiries by any regulatory or self-regulatory organization,
whether commenced or threatened in respect thereof, "CLAIMS") to which any of
them become subject under the Securities Act, the Exchange Act or otherwise,
insofar as such Claims arise out of or are based upon any of the following
statements, omissions or violations in a Registration Statement filed pursuant
to this Agreement, any post-effective amendment thereof or any prospectus
included therein: (a) any untrue statement or alleged untrue statement of a
material fact contained in the Registration Statement or any post-effective
amendment thereof or the omission or alleged omission to state therein a
material fact required to be stated therein or necessary to make the statements
therein not misleading, (b) any untrue statement or alleged untrue statement of
a material fact contained in the prospectus (as it may be amended or
supplemented) or the omission or alleged omission to state therein any material
fact necessary to make the statements made therein, in light of the
circumstances under which the statements therein were made, not misleading, or
(c) any violation or alleged violation by the Company of the Securities Act, the
Exchange Act or any other law, including without limitation any state securities
law or any rule or regulation thereunder (the matters in the foregoing clauses
(a) through (c) being, collectively, "VIOLATIONS"). Subject to the restrictions
set forth in Section 6.3 with respect to the number of legal counsel, the
Company will reimburse the Investors and each such underwriter or controlling
person and each such other Indemnified Person, promptly as such expenses are
incurred and are due and payable, for any legal fees or other reasonable
expenses incurred by them in connection with investigating or defending any
Claim. Notwithstanding anything to the contrary contained herein, the
indemnification agreement contained in this Section 6.1 (i) does not apply to a
Claim arising out of or based upon a Violation that occurs in reliance upon and
in conformity with information furnished in writing to the Company by any
Indemnified Person expressly for use in connection with the preparation of the
Registration Statement or any such amendment thereof or supplement thereto, if
such prospectus was timely made available by the Company pursuant to Section 3.3
hereof; and (ii) does not apply to amounts paid in settlement of any Claim if
such settlement is made without the prior written consent of the Company, which
consent will not be unreasonably withheld. This indemnity obligation will remain
in full force and effect regardless of any investigation made by or on behalf of
the Indemnified Persons and will survive

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the transfer of the Registrable Securities by the Investors under Article IX of
this Agreement.

         6.2 In connection with any Registration Statement in which an Investor
is participating, each such Investor will indemnify and hold harmless, to the
same extent and in the same manner set forth in Section 6.1 above, the Company,
each of its directors, each of its officers who signs the Registration
Statement, each person, if any, who controls the Company within the meaning of
the Securities Act or the Exchange Act, and any other stockholder selling
securities pursuant to the Registration Statement or any of its directors or
officers or any person who controls such stockholder within the meaning of the
Securities Act or the Exchange Act (each an "INDEMNIFIED PERSON") against any
Claim to which any of them may become subject under the Securities Act, the
Exchange Act or otherwise, insofar as such Claim arises out of or is based upon
any Violation, in each case to the extent (and only to the extent) that such
Violation occurs in reliance upon and in conformity with written information
furnished to the Company by such Investor expressly for use in connection with
such Registration Statement. Subject to the restrictions set forth in Section
6.3, such Investor will promptly reimburse any legal or other expenses (promptly
as such expenses are incurred and due and payable) reasonably incurred by them
in connection with investigating or defending any such Claim. However, the
indemnity agreement contained in this Section 6.2 does not apply to amounts paid
in settlement of any Claim if such settlement is effected without the prior
written consent of such Investor, which consent will not be unreasonably
withheld, and no Investor will be liable under this Agreement (including this
Section 6.2 and for the amount of any Claim that exceeds the net proceeds
actually received by such Investor as a result of the sale of Registrable
Securities pursuant to such Registration Statement. This indemnity will remain
in full force and effect regardless of any investigation made by or on behalf of
an Indemnified Party and will survive the transfer of the Registrable Securities
by the Investors under Article IX of this Agreement.

         6.3 Promptly after receipt by an Indemnified Person under this Article
VI of notice of the commencement of any action (including any governmental
action), such Indemnified Person will, if a Claim in respect thereof is to be
made against any indemnifying party under this Article VI, deliver to the
indemnifying party a written notice of the commencement thereof. The
indemnifying party may participate in, and, to the extent the indemnifying party
so desires, jointly with any other indemnifying party similarly given notice,
assume control of the defense thereof with counsel mutually satisfactory to the
indemnifying parties and the Indemnified Person. In that case, the indemnifying
party will diligently pursue such defense. If, in the reasonable opinion of
counsel retained by the indemnifying party, the representation by such counsel
of the Indemnified Person and the indemnifying party would be inappropriate due
to actual or potential conflicts of interest between the Indemnified Person and
any other party represented by such counsel in such proceeding or the actual or
potential defendants in, or targets of, any such action including the
Indemnified Person, and any such Indemnified Person reasonably determines that
there may be legal defenses available to such Indemnified Person that are
different from or in addition to those available to the indemnifying party, then
the Indemnified Person is entitled to assume such defense and may retain its own
counsel, with the fees and expenses to be paid by the indemnifying party. The
Company will pay for only one separate legal counsel for the Investors
collectively, and such legal counsel will be selected by the Investors holding a
majority in interest of the Registrable Securities. The failure to deliver
written notice to the indemnifying party within a reasonable time of the
commencement of any such action does not relieve an indemnifying party of any
liability to an Indemnified Person under this Article VI, except to the extent
that the indemnifying party is prejudiced in its

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ability to defend such action. The indemnification required by this Article VI
will be made by periodic payments of the amount thereof during the course of
the investigation or defense, as such expense, loss, damage or liability is
incurred and is due and payable.

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                                   ARTICLE VII

                                  CONTRIBUTION

          To the extent that any indemnification provided for herein is
prohibited or limited by law, the indemnifying party will make the maximum
contribution with respect to any amounts for which it would otherwise be liable
under Article VI to the fullest extent permitted by law. However, (a) no
contribution will be made under circumstances where the maker would not have
been liable for indemnification under the fault standards set forth in Article
VI, (b) no seller of Registrable Securities guilty of fraudulent
misrepresentation (within the meaning of Section 11(f) of the Securities Act)
will be entitled to contribution from any seller of Registrable Securities who
was not guilty of such fraudulent misrepresentation, and (c) contribution
(together with any indemnification or other obligations under this Agreement) by
any seller of Registrable Securities will be limited in amount to the net amount
of proceeds received by such seller from the sale of such Registrable
Securities.

                                  ARTICLE VIII
                             EXCHANGE ACT REPORTING

         In order to make available to the Investors the benefits of Rule 144 or
any similar rule or regulation of the SEC that may at any time permit the
Investors to sell securities of the Company to the public without registration,
the Company will:

                  (a) File with the SEC in a timely manner, and make and keep
available, all reports and other documents required of the Company under the
Securities Act and the Exchange Act so long as the Company remains subject to
such requirements (it being understood that nothing herein limits the Company's
obligations under Section 4.3 of the Purchase Agreement) and the filing and
availability of such reports and other documents is required for the applicable
provisions of Rule 144; and

                  (b) Furnish to each Investor, so long as such Investor holds
Registrable Securities, promptly upon the Investor's request, (i) a written
statement by the Company that it has complied with the reporting requirements of
Rule 144, the Securities Act and the Exchange Act, (ii) a copy of the most
recent annual or quarterly report of the Company and such other reports and
documents filed by the Company with the SEC and (iii) such other information as
may be reasonably requested to permit the Investors to sell such securities
pursuant to Rule 144 without registration.

                                   ARTICLE IX
                        ASSIGNMENT OF REGISTRATION RIGHTS

         The rights of the Investors hereunder, including the right to have the
Company register Registrable Securities pursuant to this Agreement, will be
automatically assigned by the Investors to transferees or assignees of all or
any portion of the Registrable Securities, but only if (a) the Investor agrees
in writing with the transferee or assignee to assign such rights, and a copy of
such agreement is furnished to the Company within a reasonable time after such
assignment, (b) the Company is, within a reasonable time after such transfer or
assignment, furnished with written notice of the name and address of such
transferee or assignee and the securities with respect to which such
registration rights are being transferred or assigned, (c) after such transfer
or assignment, the further disposition of such securities by the transferee or
assignee is restricted under the Securities Act and applicable state securities
laws, (d) at or before the time the Company received the written notice
contemplated by clause (b) of this sentence, the transferee or assignee agrees
in writing with the Company to be bound by all of the provisions contained
herein, (e) such transfer is made in accordance with the applicable requirements
of the Purchase Agreement, and (f) the transferee is an "accredited investor" as
that term is defined in Rule 501 of Regulation D.

                                      E-31

<PAGE>

                                    ARTICLE X
                        AMENDMENT OF REGISTRATION RIGHTS

         This Agreement may be amended and the obligations hereunder may be
waived (either generally or in a particular instance, and either retroactively
or prospectively) only with the written consent of the Company and of the
Investors who then hold a majority in interest of the Registrable Securities
(but not including any Investor who is not affected by such amendment or
waiver). Any amendment or waiver effected in accordance with this Article X is
binding upon each Investor and the Company. Notwithstanding the foregoing, no
amendment or waiver will retroactively affect any Investor without its consent,
or will prospectively adversely affect any Investor who no longer owns any
Registrable Securities without its consent. Neither Article VI nor Article VII
hereof may be amended or waived in a manner adverse to an Investor without its
consent.

                                   ARTICLE XI

                                  MISCELLANEOUS

         11.1 CONFLICTING INSTRUCTIONS. A person or entity is deemed to be a
holder of Registrable Securities whenever such person or entity owns of record
such Registrable Securities. If the Company receives conflicting instructions,
notices or elections from two or more persons or entities with respect to the
same Registrable Securities, the Company will act upon the basis of
instructions, notice or election received from the registered owner of such
Registrable Securities

         11.2 NOTICES. Any notices required or permitted to be given under the
terms of this Agreement will be given as set forth in the Purchase Agreement.

         11.3 WAIVER. Failure of any party to exercise any right or remedy under
this Agreement or otherwise, or delay by a party in exercising such right or
remedy, does not operate as a waiver thereof.

         11.4 GOVERNING LAW. This Agreement will be governed by and interpreted
in accordance with the laws of the State of New York without regard to the
principles of conflict of laws. The parties hereto hereby submit to the
exclusive jurisdiction of the United States federal and state courts located in
the State of New York with respect to any dispute arising under this Agreement,
the agreements entered into in connection herewith or the transactions
contemplated hereby or thereby.

         11.5 SEVERABILITY. If any provision of this Agreement is invalid or
unenforceable under any applicable statute or rule of law, then such provision
will be deemed modified in order to conform with such statute or rule of law.
Any provision hereof that may prove invalid or unenforceable under any law will
not affect the validity or enforceability of any other provision hereof.

         11.6 ENTIRE AGREEMENT. This Agreement and the Purchase Agreement
(including all schedules and exhibits thereto) constitute the entire agreement
among the parties hereto with respect to the subject matter hereof and thereof.
There are no restrictions, promises, warranties or undertakings, other than
those set forth or referred to herein or therein. This Agreement supersedes all
prior agreements and understandings among the parties hereto with respect to the
subject matter hereof.

         11.7 SUCCESSORS AND ASSIGNS. Subject to the requirements of Article IX
hereof, this Agreement inures to the benefit of and is binding upon the
successors and assigns of each of the parties hereto. Notwithstanding anything
to the contrary herein, including, without limitation, Article IX, the rights of
an Investor hereunder are assignable to and exercisable by a bona fide pledgee
of the Registrable Securities in connection with an Investor's margin or
brokerage accounts.

         11.8 USE OF PRONOUNS. All pronouns refer to the masculine, feminine or
neuter, singular or plural, as the context may require

                                      E-32

<PAGE>

         11.9 HEADINGS. The headings of this Agreement are for convenience of
reference only, are not part of this Agreement and do not affect its
interpretation.

         11.10 COUNTERPARTS. This Agreement may be executed in two or more
counterparts, each of which is deemed an original but all of which constitute
one and the same agreement. This Agreement, once executed by a party, may be
delivered to the other party hereto by facsimile transmission, and facsimile
signatures are binding on the parties hereto.

         11.11 FURTHER ASSURANCES. Each party will do and perform, or cause to
be done and performed, all such further acts and things, and will execute and
deliver all other agreements, certificates, instruments and documents, as
another party may reasonably request in order to carry out the intent and
accomplish the purposes of this Agreement and the consummation of the
transactions contemplated hereby.

         11.12 CONSENTS. All consents and other determinations to be made by the
Investors pursuant to this Agreement will be made by the Initial Investors or
the Investors holding a majority in interest of the Registrable Securities.

         11.13 NO STRICT CONSTRUCTION. The language used in this Agreement is
deemed to be the language chosen by the parties to express their mutual intent,
and no rules of strict construction will be applied against any party.

         IN WITNESS WHEREOF, the undersigned Subscriber and the Company have
caused this Agreement to be duly executed as of the date first above written.

COMPANY:

ADATOM.COM, INC.

---------------------------------
By:
Name:
Title:   Chief Executive Officer

                       SIGNATURES CONTINUED ON NEXT PAGE]

                                      E-33

<PAGE>

SUBSCRIBER:

[Name of Entity]

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

Address:

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

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

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

[Name of Person]

---------------------------------
Name:

Address:

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

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

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

                                      E-34Exhibit 4.13

                          REGISTRATION RIGHTS AGREEMENT

                                  by and among

                       HEALTHCORE MEDICAL SOLUTIONS, INC.

                                       and

                         NEAL J. POLAN, individually and
                         as custodian for BARRETT POLAN

                                October 12, 1999

                          REGISTRATION RIGHTS AGREEMENT

                  THIS AGREEMENT, dated as of October 12, 1999, is entered into
by and among HealthCore Medical Solutions, Inc., a corporation organized under
the laws of Delaware (the "COMPANY") and Neal J. Polan, individually and as
custodian for Barrett Polan and residing at 20 Cameron Drive, Greenwich,
Connecticut 06831 (collectively, the "SHAREHOLDER").

                                             WITNESSETH:

                  WHEREAS, on the date hereof, the Company is consummating a
merger with Adatom, Inc., a California corporation; and

                  WHEREAS, as a condition to the closing of the merger, the
Company has agreed to grant to the Shareholder the registration rights provided
for herein.

                  NOW, THEREFORE, in consideration of the premises, mutual
covenants and agreements herein contained and for other good and valuable
consideration, the receipt and adequacy of which are hereby acknowledged, the
parties hereto hereby agree as follows:

ARTICLE I.        CERTAIN DEFINITIONS.

                  For the purposes of this Agreement, the following terms shall
have the respective meanings set forth below:

                  "Advice" is as defined in Section 2.05.

                  "Agreement" means this Agreement, as from time to time
assigned, supplemented, amended or modified in accordance with the terms hereof.

                  "Company" is as defined in the preamble.

                  "Demand Registration" is as defined in Section 2.01.

                  "Demand Request" is as defined in Section 2.01.

                  "Exchange Act" means the United States Securities Exchange Act
of 1934, as amended, or any similar federal law then in force.

                                      E-35

<PAGE>

                  "Indemnified Person" is as defined in Section 2.09(a).

                  "Material Adverse Effect" is as defined in Section 2.03(a).

                  "NASD" is as defined in Section 2.04(p).

                  "Polan Shares" means (i) the 165,000 shares of Class A Common
Stock $.01 par value, of the Company issued to Shareholder on September 10,
1999; (ii) the shares issued or issuable upon exercise of the warrant to
purchase 142,000 shares of Class A Common Stock $.01 par value of the Company,
which warrant is currently exercisable in full at an exercise price of $1.00 per
share and was issued to Shareholder in September 1997 and expires on September
2007; (iii) the 28,400 shares of Class A Common Stock, $.01 par value, of the
Company issuable upon exchange of a separate warrant to purchase 142,000 shares
of Class A Common Stock $-.01 par value, of the Company, at $1.00 per share,
which warrant IS NOT currently exercisable and was issued to Shareholder in
September, 1997; (iv) 25,200 shares of Class B Common Stock, $.01 par value,
owned by Shareholder, which shares are being released from escrow pursuant to an
escrow termination agreement dated July 1, 1999 between the Company and
Shareholder; and (v) 7,200 shares of Class B Common Stock, $.01 par value, owned
by Shareholder as custodian for Barrett Polan, which shares also are being
released from escrow pursuant to such escrow termination agreement (together
with any Shares or other securities into which such shares or other securities
may be changed, converted or exchanged).

                  "Proposed Registration" is as defined in Section 2.02(a).

                  "SEC" means the United States Securities and Exchange
Commission.

                  "Securities Act" means the United States Securities Act of
1933, as amended, or any similar federal law then in force.

                  "Shareholder" is as defined in the preamble.

                  "Shares" means common stock of the Company, par value $.01 per
share issued or issuable upon exercise of convertible securities, warrants or
options.

                  "Suspension Notice" is as defined in Section 2.05.

ARTICLE II.       REGISTRATION RIGHTS.

                  SECTION 2.01      DEMAND REGISTRATION.

                  (a) At any time after February 9, 2000, provided the Company
shall not prior to such date have caused a registration statement to have been
declared effective by the SEC pursuant to Section 2.02 covering all of the Polan
Shares, the Shareholder may require the Company (pursuant to a written notice to
the Company) to effect the registration under the Securities Act of Polan Shares
of the Company other than pursuant to a registration statement on Form S-1 (a
"DEMAND REGISTRATION"). Such request (a "DEMAND REQUEST") by the Shareholder
shall (i) specify the class and number of Polan Shares which the Shareholder
intends to sell or dispose of, and (ii) state the intended method or methods by
which the Shareholder intends to sell or dispose of such Polan Shares. In
connection with any underwritten public offering, the underwriter thereof shall
be selected by the Shareholder, subject to the consent of the Company, which
shall not be unreasonably withheld, Upon receipt of a Demand Request, the
Company shall (as requested) cause to be filed, within thirty (30) calendar days
of the date of delivery to the Company of the request, a registration statement
covering such Polan Shares which the Company has been so requested to register,
providing for the registration under the Securities Act of such Polan Shares to
the extent necessary to permit the disposition of such Polan Shares to be
registered in accordance with the intended method of distribution specified in
such request. The Shareholder shall have the right to exercise only one such
Demand Registration; provided, however, if the Shareholder shall not be entitled
to include all of its Polan Shares in a Demand Registration, the Shareholder may
be entitled to make an additional Demand Request, notwithstanding the
registration of certain of the Polan Shares pursuant to the then pending Demand
Registration.

                                      E-36

<PAGE>

                  (b) Notwithstanding the foregoing, the Company shall not be
required to effect any registration statement pursuant to this Section 2.01 (i)
within 90 days after the effective date of any other registration statement of
the Company's securities or (ii) during the pendency of any Demand Blackout
Period.

                  (c) If any of the Company's investment banker or any
underwriter determines in good faith that the registration statement and
distribution of the Polan Shares (or the use of the registration statement or
related prospectus) would materially interfere with any pending financing,
merger, acquisition or corporate reorganization involving the Company (or would
require premature disclosure thereof), and promptly gives the Shareholder
written notice of such determination following its Demand Request, the Company
shall be entitled to postpone the filing of the registration statement otherwise
required to be prepared and filed by the Company pursuant to Section 2.01 for a
reasonable period of time, not to exceed 90 days (a "Demand Blackout Period").
The Company shall promptly notify the Shareholder of the expiration or earlier
termination of any Demand Blackout Period, and upon such expiration or
termination the Company shall immediately file the registration statement
pursuant to Section 2.01. The rights under this Section 2.01 shall be separate
and distinct from any other rights the Shareholder may have under Section 2.02.

                  SECTION 2.02      PIGGYBACK RIGHTS.

                  (a) Each time that the Company proposes for any reason to
register any of its securities under the Securities Act (a "PROPOSED
REGISTRATION"), other than pursuant to a registration statement on Form S-4 or
similar or successor form, the Company shall promptly give written notice of
such Proposed Registration to the Shareholder (which notice shall be given not
less than thirty (30) calendar days prior to the effective date of the Company's
registration statement) and the Shareholder shall have the right to request
inclusion of any of the Polan Shares in the Proposed Registration, unless, in
the case of a Proposed Registration on Form S-8, the Polan Shares are ineligible
for registration on Form S-8. No registration pursuant to this Section 2.02
shall relieve the Company of its obligation to register Polan Shares pursuant to
Section 2.01.

                  (b) The Shareholder shall have twenty-five (25) calendar days
from the receipt of such notice to deliver to the Company a written request
specifying the number of Polan Shares the Shareholder intends to sell and the
Shareholder's intended method of disposition. The Shareholder shall have the
right to withdraw its request for inclusion of all or a portion of such Polan
Shares in any registration statement pursuant to this Section 2.02 by giving
written notice to the Company of such withdrawal. Subject to Section 2.03 below,
the Company shall include in such registration statement all such Polan Shares
so requested to be included therein; PROVIDED, HOWEVER, that the Company may at
any time withdraw or cease proceeding with any such piggyback registration if it
shall at the same time withdraw or cease proceeding with the registration of all
other equity securities originally proposed to be registered.

                  (c) In the event that the Proposed Registration by the Company
is, in whole or in part, an underwritten public offering of securities of the
Company, any request under Section 2.02(b) hereof must specify that the Polan
Shares be included in the underwriting on the same terms and conditions as the
shares otherwise being sold through underwriters under such registration.

                  SECTION 2.03      PRIORITY ON REGISTRATIONS.

                  (a) If the managing underwriter advises the Company that the
inclusion of such Polan Shares in a proposed Registration pursuant to Section
2.02 would materially and adversely affect the price or success of the offering
(a "MATERIAL ADVERSE EFFECT"), the Company will be obligated to include in such
registration statement, as to the Shareholder (subject to the priority rules set
forth below), that portion of the Polan Shares the Shareholder has requested to
be registered equal to the ratio which the Shareholder's requested Polan Shares
bears to the total number of shares requested to be included in such
registration statement by all other persons (other than the Company, if such
registration has been initiated by the Company for securities to be offered by
the Company) who have requested that their shares be included in such
registration statement, provided, however, if in the judgment of the managing
underwriter no such reduction would eliminate such Material Adverse Effect, then
the Company shall have the right to exclude all such Polan Shares from such
registration statement provided no other securities are included and offered for
the account of any other person in such registration statement. It is
acknowledged by the Shareholder that pursuant to the foregoing provision, the
securities to be included in such registration shall be allocated, (1) first, to
the Company if

                                      E-37
<PAGE>

it initiated the Proposed Registration or to such other third party who is
exercising demand registration rights, and (2) second, to the Shareholder and to
all other persons requesting securities to be included therein (in accordance
with the above-described ratio). If as a result of the provisions of this
Section 2.03(a) the Shareholder shall not be entitled to include all of its
Polan Shares in a registration that the Shareholder has requested to be so
included, the Shareholder may withdraw the Shareholder's request to include
Polan Shares in such registration statement.

                  (b) The Shareholder may not participate in any registration
statement hereunder unless the Shareholder completes, executes and delivers all
questionnaires, powers of attorney, indemnities, underwriting agreements, and
other documents reasonably required under the terms of such underwriting
arrangements, including an opinion of its counsel, as are required of any other
shareholders registering shares who are not affiliates of the Company, and shall
furnish such information regarding the Polan Shares and the intended method of
distribution of the Polan Shares as shall be reasonably required to effect such
registration.

                  SECTION 2.04 REGISTRATION PROCEDURES. Whenever the Shareholder
has requested that any Polan Shares be registered pursuant to the provisions of
this Article II, the Company will use its commercially reasonable efforts to
effect the registration and the sale of such Polan Shares in accordance with the
intended method of disposition thereof as set forth in the written request, and
pursuant thereto the Company shall:

                  (a) prepare and file with the SEC a registration statement
with respect to such securities on the appropriate forms, and use commercially
reasonable efforts to cause such registration statement(s) to become and remain
effective in accordance with Section 2.04(b) hereof and in accordance with all
laws, rules and regulations applicable thereto;

                  (b) prepare and file with the SEC such amendments and
supplements to such registration statements and the prospectus used in
connection therewith as may be necessary to keep such registration statement
effective until the earlier of (i) the sale of all Polan Shares covered thereby
or (ii) the expiration of twelve months from the effective date of the
registration statement, and to comply with the provisions of the Securities Act
with respect to the sale or other disposition of all Polan Shares covered by
such registration statement;

                  (c) furnish to the Shareholder pursuant to Section 2.01 or
Section 2.02 such number of copies of any summary prospectus or other
prospectus, including a preliminary prospectus, in conformity with the
requirements of the Securities Act, and such other documents as the Shareholder
may reasonably request in order to facilitate the public sale or other
disposition of such Polan Shares;

                  (d) use commercially reasonable efforts to register or qualify
the Shares covered by such registration statement under the securities or blue
sky laws of such jurisdictions as the Shareholder shall reasonably request;
PROVIDED, HOWEVER, that the Company shall not be required to consent to general
service of process for all purposes in any jurisdiction where it is not then
subject to process, qualify to do business as a foreign company where it would
not be otherwise required to qualify or submit to liability for state or local
taxes where it is not otherwise liable for such taxes;

                  (e) at any time when a prospectus relating thereto covered by
such registration statement is required to be delivered under the Securities Act
within the appropriate period mentioned in Section 2.04(b) hereof, promptly
notify the Shareholder and each underwriter and (if requested by the
Shareholder) confirm such notice in writing (i) when a prospectus or any
prospectus supplement or post-effective amendment has been filed and, with
respect to a registration statement or any post-effective amendment, when the
same has become effective, (ii) of the issuance by any state securities or other
regulatory authority of any order suspending the qualification or exemption from
qualification of any of the Polan Shares under state securities or blue sky laws
or the initiation of any proceedings for that purpose, and (iii) of the
happening of any event as a result of which the prospectus included in such
registration, as then in effect, includes an untrue statement of a material fact
or omits to state a material fact required to be stated therein or necessary to
make the statements therein not misleading in light of the circumstances then
existing and, at the request of the Shareholder, prepare, file and furnish to
the Shareholder a reasonable number of copies of a supplement to or an amendment
of such prospectus as may be necessary so that, as thereafter delivered to the
purchasers of such shares, such prospectus shall not include an untrue statement
of a

                                      E-38
<PAGE>

material fact or omit to state a material fact required to be stated therein or
necessary to make the statements therein not misleading in the light of the
circumstances then existing;

                  (f) if the Company has delivered preliminary or final
prospectuses to the Shareholder and after having done so the prospectus is
amended to comply with the requirements of the Securities Act, the Company shall
promptly notify the Shareholder and, if requested, the Shareholder shall
immediately cease making offers of Polan Shares and return all prospectuses to
the Company. The Company shall promptly provide the Shareholder with revised
prospectuses and, following receipt of the revised prospectuses, the Shareholder
shall be free to resume making offers of the Polan Shares;

                  (g) if any proposed registration effected pursuant to Section
2.01 or Section 2.02 involves an underwritten public offering cause all Shares
to be listed for trading on the principal national securities exchange (if any)
where the Company's common stock is listed for trading;

                  (h) before filing a registration statement or amendment
thereto, furnish to each Shareholder and its counsel and other representatives
and the underwriters, if any, copies of each such registration statement or
amendment proposed to be filed, which documents shall be made available on a
timely basis for review and comment by the Shareholder, the underwriters (if
any) and their respective representatives;

                  (i) cooperate with the Shareholder and the managing
underwriter to facilitate the timely preparation and delivery of certificates
(which shall not bear any restrictive legends unless required under applicable
law) representing securities sold under any registration statement (if any), and
enable such securities to be in such denominations and registered in such names
as the managing underwriter or such sellers may request and keep available and
make available to the Company's transfer agent prior to the effectiveness of
such registration statement a supply of such certificates;

                  (j) in the event that the Shareholder may be considered to be
a "control person," promptly make available for inspection by the Shareholder,
any underwriter participating in any disposition pursuant to any registration
statement, and any attorney, accountant or other agent or representative
retained by any the Shareholder or underwriter (collectively, the "Inspectors"),
all financial and other records, pertinent corporate documents and properties of
the Company (collectively, the "Records"), as shall be reasonably necessary to
enable them to exercise their due diligence responsibility, and cause the
Company's officers, directors and employees to supply all information reasonably
requested by any such Inspector in connection with such registration statement;
PROVIDED, that, unless the disclosure of such Records is necessary to avoid or
correct a misstatement or omission in the registration statement or the release
of such Records is ordered pursuant to a subpoena or other order from a court of
competent jurisdiction, the Company shall not be required to provide any
information under this subparagraph (n) if (i) the Company believes, after
consultation with counsel for the Company, that to do so would cause the Company
to forfeit an attorney-client privilege that was applicable to such information
or (ii) if either (A) the Company has requested and been granted from the SEC
confidential treatment of such information contained in any filing with the SEC
of documents provided supplementally or otherwise or (B) the Company reasonably
determines in good faith that such Records are confidential and so notifies the
Inspectors in writing unless prior to furnishing any such information with
respect to (i) or (ii) the Shareholder requesting such information agrees to
enter into a confidentiality agreement in customary form and subject to
customary exceptions; and PROVIDED, FURTHER, that the Shareholder agrees that it
will, upon learning that disclosure of such Records is sought in a court of
competent jurisdiction, give notice to the Company and allow the Company at its
expense, to undertake appropriate action and to prevent disclosure of the
Records deemed confidential;

                  (k) provide, if required, a CUSIP number for the Shares
included in any registration statement not later than the effective date of such
registration statement;

                  (l) cooperate with the Shareholder and each underwriter
participating in the disposition of such Shares and their respective counsel in
connection with any filings required to be made with the National Association of
Securities Dealers, Inc. ("NASD");

                                      E-39
<PAGE>

                  (m) during the period when the prospectus is required to be
delivered under the Securities Act, promptly file all documents required to be
filed with the SEC pursuant to Sections 13(a), 13(c) or 14 of the Exchange Act;

                  (n) notify the Shareholder promptly of any request by the SEC
for the amending or supplementing of such registration statement or prospectus
or for additional information;

                  (o) prepare and file with the SEC promptly any amendments or
supplements to such registration statement or prospectus which, in the opinion
of counsel for the Company is required in connection with the distribution of
the Shares;

                  (p) advise the Shareholder, promptly after it shall have
received notice or obtain knowledge thereof, of the issuance of any stop order
by the SEC suspending the effectiveness of such registration statement or the
initiation or threatening of any proceeding for such purpose and promptly use
its best efforts to prevent the issuance of any stop order or to obtain its
withdrawal at the earliest possible moment if such stop order should be issued;
and

                  (q) in the case of a Demand Request pursuant to Section 2.01
if the Shareholder so requests, to request acceleration of effectiveness of the
registration statement from the SEC, PROVIDED at the time of such request the
Company does not, in good faith, believe it is necessary to amend further the
registration statement in order to comply with the provisions of Section 2.04.
If the Company wishes to further amend the registration statement prior to
requesting acceleration, it shall have such time as is reasonable given the
nature of the amendment to so amend prior to requesting acceleration.

                  SECTION 2.05 SUSPENSION OF DISPOSITIONS. The Shareholder
agrees that upon receipt of any notice (a "SUSPENSION NOTICE") from the Company
of the happening of any event of the kind described in Section 2.04(e)(iii), the
Shareholder will forthwith discontinue disposition of Polan Shares that have
been registered under this Article 2 until the Shareholder's receipt of the
copies of the supplemented or amended prospectus, or until it is advised in
writing (the "ADVICE") by the Company that the use of the prospectus may be
resumed, and has received copies of any additional or supplemental filings which
are incorporated by reference in the prospectus, and, if so directed by the
Company, the Shareholder will deliver to the Company all copies, other than
permanent file copies then in the Shareholder's possession, of the prospectus
covering such Shares current at the time of receipt of such Suspension Notice.
In the event the Company shall give any such Suspension Notice, the time period
regarding the effectiveness of registration statements set forth in Section
2.04(b) hereof shall be extended by the number of days during the period from
and including the date of the giving of the Suspension Notice to and including
the date when each seller of Shares covered by such registration statement shall
have received the copies of the supplemented or amended prospectus or the
Advice. The Company shall use its commercially reasonable efforts and take such
actions as are reasonably necessary to render the Advice as promptly as
practicable.

                  SECTION 2.06 COOPERATION UPON A REGISTRATION. The Shareholder
and the Company agree that, in connection with any exercise of registration
rights pursuant to this Article 2, the Shareholder will authorize, and will
authorize and direct the Company to take, such actions as are necessary or
appropriate to effectuate such registration. In addition, the Shareholder agrees
to cooperate fully with the Company and the underwriters of any underwritten
public offering in the preparation of all documentation necessary or desirable
to effectuate any registration of any Polan Shares under the Securities Act
pursuant to this Article 2, or registration or qualification of any Polan Shares
pursuant to Section 2.04(d) hereof. In addition, the Shareholder shall notify
the Company, at any time when a prospectus is required to be delivered under
applicable law, of the happening of any event as a result of which the
prospectus included in the applicable registration statement, as then in effect,
in each case with respect to the information provided by the Shareholder,
includes an untrue statement of a material fact or omits to state a material
fact required to be stated therein or necessary to make the statements therein
not misleading in light of the circumstances then existing. The Shareholder
shall thereafter take the actions required by Section 2.05.

                  SECTION 2.07 EXPENSES. The Company shall pay all expenses
incurred by the Company in complying with Sections 2.01, 2.02 and 2.04 hereof,
including, without limitation, all registration and filing fees (including all
expenses incident to filing with the NASD), fees and expenses of complying with
the securities or blue sky

                                      E-40

<PAGE>

laws of all such jurisdictions in which the Shares are proposed to be offered
and sold (including reasonable fees and disbursements of counsel in connection
with blue sky qualification of Shares), rating agency fees, printing expenses,
messenger and delivery expenses, the Company's internal expenses (including
without limitation all salaries and expenses of its officers and employees
performing legal or accounting duties), fees and expenses incurred in connection
with any listing of the Shares, fees and expenses of counsel for the Company and
its independent certified public accountants (including the expenses of any
special audit or cold comfort letters required by or incident to such
performance), securities act liability insurance (if the Company elects to
obtain such insurance) and fees and disbursements of underwriters (to the extent
the Company is liable therefor under the terms of any underwriting agreement),
whether or not any registration statement becomes effective; PROVIDED, HOWEVER,
that all underwriting discounts and selling commissions applicable to the Shares
covered by registrations effected pursuant to Section 2.01 or Section 2.02
hereof shall be borne by the Shareholder, in proportion to the number of Shares
sold by the Shareholder, and except as expressly provided in this Section 2.07,
in no event shall the Company pay any fees or expenses of or attributable to the
Shareholder or any counsel, accountants or other persons retained or employed by
the Shareholder.

                  SECTION 2.08      INDEMNIFICATION.

                  (a) In the event of any registration of any Shares under the
Securities Act pursuant to this Article 2 or registration or qualification of
any Shares pursuant to Section 2.04(d) hereof, the Company shall indemnify and
hold harmless the Shareholder, each director, officer, employee, trustee, and
partner of the Shareholder and each other person, if any, who controls any of
the foregoing persons, within the meaning of the Securities Act (each, an
"INDEMNIFIED PERSON"), against any losses, claims, damages, liabilities or
expenses, joint or several, to which any of the foregoing persons may become
subject under the Securities Act or otherwise, insofar as such losses, claims,
damages or liabilities (or actions in respect thereof) arise out of, are related
to, result from or are based upon an untrue statement or alleged untrue
statement of a material fact contained in any registration statement under which
such Shares were registered under the Securities Act, any preliminary prospectus
or final prospectus contained therein, or any amendment or supplement thereto,
or any document incident to registration or qualification of any Shares pursuant
to Section 2.04(d) hereof, or arise out of, are related to, result from or are
based upon the omission or alleged omission to state therein a material fact
required to be stated therein or necessary to make the statements therein not
misleading or, with respect to any prospectus, necessary to make the statements
therein, in light of the circumstances under which they were made, not
misleading, or any violation by the Company of the state securities or blue sky
laws applicable to the Company and relating to action or inaction required of
the Company in connection with such registration or qualification under such
state securities or blue sky laws. The Company shall reimburse on demand each
Indemnified Person for any legal or any other costs and expenses reasonably
incurred by any of them in connection with investigating, preparing for,
defending or settling any such loss, claim, damage, liability or action by any
governmental agency or body; PROVIDED, HOWEVER, that the Company shall not be
liable in any such case to the extent that any such loss, claim, damage,
liability or expense arises out of or is based upon an untrue statement or
alleged untrue statement or omission or alleged omission made in said
registration statement, preliminary or final prospectus or amendment or
supplement thereto or any document incident to registration or qualification of
any Shares pursuant to Section 2.04(d) hereof, in reliance upon and in
conformity with written information furnished to the Company by the Shareholder,
underwriter, broker, other person or controlling person specifically for use in
the preparation thereof or arises out of or is based upon the Indemnified
Person's failure to deliver a copy of the registration statement or prospectus
or any amendments or supplements thereto after the Company has furnished such
Indemnified Person with a sufficient number of copies of the same.

                  (b) Before Shares shall be included in any registration
pursuant to this Article II, the Shareholder will furnish to the Company in
writing such information and affidavits as the Company reasonably requests for
use in connection with any such registration statement and prospectus, and the
Shareholder shall have agreed to indemnify and hold harmless (in the same manner
and to the same extent as set forth in paragraph (a) above) the Company, each
member of the Board of Directors of the Company, each officer of the Company who
signs such registration statement, every other participating shareholder and any
person who controls the Company within the meaning of the Securities Act, with
respect to any untrue statement or omission from such registration statement,
any preliminary prospectus or final prospectus contained therein, or any
amendment or supplement thereto, if such untrue statement or omission was made
in reliance upon and in conformity with such written information furnished to
the

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<PAGE>

Company by the Shareholder or such underwriter for use in the preparation of
such registration statement, preliminary prospectus, final prospectus or
amendment or supplement; PROVIDED, HOWEVER, that the maximum amount of liability
in respect of such indemnification shall be limited to an amount equal to the
net proceeds actually received by the Shareholder from the sale of Shares
effected pursuant to such registration.

                  (c) Promptly after receipt by an Indemnified Person of notice
of the commencement of any action involving a claim referred to in Section
2.08(a) or (b) hereof, such Indemnified Person will, if a claim in respect
thereof is to be made against the indemnifying party under this Section 2.08,
give written notice to the latter of the commencement of such action (provided
that the failure to give such notice shall not limit the rights of such
Indemnified Person to the extent that such failure or delay in notifying the
indemnifying party does not prevent the indemnifying party from presenting a
proper defense against the claim). In case any such action is brought against an
Indemnified Person, the indemnifying party will be entitled to participate in
and to assume the defense thereof, jointly with any other indemnifying party
similarly notified to the extent that it may wish, with counsel reasonably
satisfactory to such Indemnified Person, and, after notice to such Indemnified
Person from the indemnifying party of its election to assume the defense
thereof; PROVIDED, HOWEVER, that, if any Indemnified Person shall have
reasonably concluded that there may be one or more legal defenses available to
such Indemnified Person which are different from, in conflict with or additional
to those available to the indemnifying party, or that such claim or litigation
involves or could have an effect upon matters beyond the scope of the indemnity
agreement provided in this Section 2.08, or if the indemnifying party fails to
take diligent action to defend such claim within twenty (20) calendar days
following notice thereof from the Indemnified Person, the indemnifying party
shall not have the right to assume the defense of such action on behalf of such
Indemnified Person, and such indemnifying party shall reimburse such Indemnified
Person and any person controlling such Indemnified Person for the fees and
expenses of counsel retained by the Indemnified Person which are reasonably
related to the matters covered by the indemnity agreement provided in this
Section 2.08. If the indemnifying party does assume its own defense as permitted
hereunder, from such time the Indemnified Person shall bear the expenses of its
own separate counsel. If such defense is not assumed by the indemnifying party
as permitted hereunder, the indemnifying party will not be subject to any
liability for any settlement made by the Indemnified Person without its written
consent, which consent shall not be unreasonably withheld. If such defense is
assumed by the indemnifying party pursuant to the provisions hereof, such
indemnifying party shall not make any settlement of the applicable claim
indemnified against hereunder without the written consent of the Indemnified
Person or persons, which consent shall not be unreasonably withheld. An
indemnifying party who is not entitled to, or elects not to, assume the defense
of a claim will not be obligated to pay the fees and expenses of more than one
counsel for all parties indemnified by such indemnifying party with respect to
such claim, unless in the reasonable judgment of any Indemnified Person, a
conflict of interest may exist between such Indemnified Person and any other
such Indemnified Person with respect to such claim, in which event the
indemnifying party shall be obligated to pay the reasonable fees and
disbursements of such additional counsel or counsels.

                  (d) In order to provide for just and equitable contribution to
joint liability under the Securities Act in any case in which an Indemnified
Person makes a claim for indemnification pursuant to this Section 2.08, but it
is judicially determined that such indemnification may not be enforced in such
case notwithstanding the fact that this Section 2.08 provides for
indemnification in such case, then the Company and the Shareholder will
contribute to the aggregate losses, claims, damages or liabilities to which they
may be subject as is appropriate to reflect, as between the Company and the
Shareholder, on the one hand, and the underwriter on the other hand, the
relative fault of the Company and the Shareholder in connection with the
statements or omissions which resulted in such losses, claims, damages or
liabilities, it being understood that the parties acknowledge that the
overriding equitable consideration to be given effect in connection with this
provision is the ability of one party or the other to correct the statement or
omission which resulted in such losses, claims, damages or liabilities, and that
it would not be just and equitable if contribution pursuant hereto were to be
determined by pro rata allocation or by any other method of allocation which
does not take into consideration the foregoing equitable considerations.
Notwithstanding the foregoing, (i) the Shareholder will not be required to
contribute any amount in excess of the net proceeds to it of all Shares sold by
it pursuant to such registration statement, and (ii) no person guilty of
fraudulent misrepresentation, within the meaning of Section 11(f) of the
Securities Act, shall be entitled to contribution from any person who is not
guilty of such fraudulent misrepresentation. If indemnification is available
under this Section 2.08, the indemnifying parties shall indemnify each
Indemnified Person to the full extent provided in Section 2.08(a) and Section
2.08(b) without regard to the relative

                                      E-42

<PAGE>

fault of said indemnifying party or Indemnified Person or any other equitable
consideration provided for in this Section 2.08(d).

                  (e) Notwithstanding any of the foregoing, if in connection
with an underwritten public offering of any Shares, the Company, the Shareholder
and the underwriters enter into an underwriting or purchase agreement relating
to such offering which contains provisions covering indemnification among the
parties, the indemnification provided thereunder shall be in lieu of the
indemnification provided to the Shareholders hereunder.

                  (f) The indemnification and contribution required by this
Section 2.09 shall be made by periodic payment of the amount thereof during the
course of the investigation or defense, as and when bills are received or
expense, loss, damage or liability is incurred; PROVIDED, that the party
receiving such indemnification or contribution provides a bond or other form of
security reasonably acceptable to the indemnifying or contributing party and
PROVIDED, FURTHER, if a court of competent jurisdiction finally determines that
any Indemnified Person which has received payments hereunder does not have an
indemnification right under this Section 2.08 for any reason, then such
Indemnified Person shall within five (5) calendar days of such final
determination, refund all amounts received hereunder to the Company or the
Shareholder, as the case may be.

                  (g) The indemnification and contribution provided for
hereunder will remain in full force and effect regardless of any investigation
made by or on behalf of any Indemnified Person and will survive the transfer of
Shares.

ARTICLE III.      MISCELLANEOUS.

                  SECTION 3.01 NOTICES. Any and all notices, consents, offers,
acceptances, or any other communication provided for herein shall be sufficient
if given in writing and deemed received when delivered by first class,
registered or certified mail, postage prepaid or overnight courier or hand
delivery, or when sent by facsimile transmission (confirmed by facsimile machine
report and with a confirmation letter sent by first class mail, postage prepaid)
which shall be addressed, or sent to the address or telecopier number of the
party set forth below its signature hereto or, in each case, such other address
or telecopier number, as the case may be, as such party may from time to time
designate in writing to the other parties.

                  SECTION 3.02 AMENDMENT AND WAIVER. No change or modification
of, or waiver of compliance with, this Agreement shall be valid unless the same
shall be in writing and signed by all of the parties hereto.

                  SECTION 3.03 TERMINATION. This Agreement will terminate at the
earlier of the date on which all the Polan Shares have been sold by the
Shareholder (or a permitted assignee hereunder) or the second anniversary of the
date hereof.

                  SECTION 3.04 NO WAIVER. No failure or delay on the part of the
Company or the Shareholder in exercising any right, between the Company and the
Shareholder shall operate as a waiver thereof nor shall any single or partial
exercise of any right, power or privilege hereunder preclude the simultaneous or
later exercise of any other right, power or privilege. The rights and remedies
herein expressly provided are cumulative and not exclusive of any rights or
remedies which the Company or the Shareholder would otherwise have. No notice to
or demand on the Company or the Shareholder, as the case may be, in any case
shall entitle the Company or the Shareholder, as the case may be, to any other
or further notice or demand in similar or other circumstances or constitute a
waiver of the rights of the Company or the Shareholder to take any other or
further action in any circumstances without notice or demand.

                  SECTION 3.05 SPECIFIC PERFORMANCE. Each party to this
Agreement acknowledges that the other parties will suffer irreparable injury in
the event of any breach of any provision of this Agreement and that therefore
the remedy at law for any breach or threatened breach of any such provision of
this Agreement will be inadequate. Accordingly, upon a breach or threatened
breach of any such provision of this Agreement by any party hereto, the other
parties shall, in addition and without prejudice to any of the rights and
remedies they may have, be entitled as a matter of right, without proof of
actual damages, to seek specific performance of such provisions of this
Agreement and to

                                      E-43
<PAGE>

such other injunctive or equitable relief to enforce, or prevent any violations
(whether anticipatory, continuing or future) of, such provisions of this
Agreement.

                  SECTION 3.06 COUNTERPARTS AND HEADINGS. This Agreement may be
executed in two or more counterparts, each of which shall be deemed to be an
original, but all of which together shall constitute one and the same
instrument. All headings and any cover page are inserted for convenience or
reference only and shall not affect its meaning or interpretation.

                  SECTION 3.07 NOUNS AND PRONOUNS. Whenever the context may
require, any pronouns used herein shall include the corresponding masculine,
feminine or neuter forms, and the singular form of nouns and pronouns shall
include the plural and vice-versa.

                  SECTION 3.08 EXPENSES. Except as provided in Section 2.08
hereto, each of the parties to this Agreement shall bear its own expenses,
including, without limitation, the fees and disbursements of its respective
counsel, in connection with the negotiation and execution of this Agreement and
the consummation of the transactions contemplated hereby.

                  SECTION 3.09 GOVERNING LAW. This Agreement will be governed
by, and construed and enforced in accordance with, the laws of the State of New
York, U.S.A., without regard to its conflict of law rules.

                  SECTION 3.10 SUCCESSORS AND ASSIGNS. This Agreement shall be
binding upon and shall inure to the benefit of the Company and its successors,
and the Shareholder and its successors and assigns; PROVIDED that the rights and
obligations of the Shareholder hereunder shall inure to the benefit of and be
binding upon any transferee of the Shareholder only if such transferee (i) is a
spouse or child or a trust established for the benefit of the Shareholder's
spouse, child or children, or a limited liability company or limited
partnership, the members or partners of which are members of the Shareholder's
immediate family, and (ii) agrees in writing to be bound by the provisions of
this Agreement.

                  SECTION 3.11 SEVERABILITY. In the event that any provision of
this Agreement becomes or is declared by a court of competent jurisdiction to be
illegal, invalid or unenforceable, the remaining provisions hereof shall
nevertheless continue in full force and effect as though the illegal, invalid or
unenforceable provisions were not a part hereof, and the parties shall exert
their best efforts to amend this Agreement to include a provision which is
legal, valid and enforceable, or to take such other action, which in either case
carries out the original intent of the parties.

                  SECTION 3.12 COMPLETE AGREEMENT. This Agreement contains the
entire agreement among the parties with respect to the subject matter hereof and
supersedes all prior and contemporaneous arrangements or understandings, whether
written or oral, between or among any of the parties hereto, with respect to the
subject matter hereof.

                  SECTION 3.13 FURTHER ASSURANCES. Each of the parties to this
Agreement agrees to execute such other documents and take such other action as
may be reasonably necessary to implement and carry out the intent of this
agreement.

                  IN WITNESS WHEREOF, the parties hereto have signed this
Agreement as of the day and year first above written.

                                             HEALTHCORE MEDICAL SOLUTIONS, INC.

                                             By:
                                                -------------------------------
                                             Name:  David L. Mullikin
                                             Title:  President
                                             Notice Address:
                                             11904 Blue Ridge Boulevard
                                             Grandview, Missouri  64030
                                             Attention:  Chairman
                                             Telecopier:

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<PAGE>

                                                     with a copy to:

                                             Richard S. Barton
                                             Adatom, Inc.
                                             920 Hillview Court
                                             Milpitas, CA 95035

                                             NEAL J. POLAN,
                                             individually and as custodian
                                             for Barrett Polan

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

                                             ----------------------
                                             Notice Address:

                                             20 Cameron Drive
                                             Greenwich, CT  06831

AGREED AND ACCEPTED
ADATOM, INC.

By:
           ------------------------------------------
     Name: Richard S. Barton
           Title: Chief Executive Officer

                                      E-45

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