<PAGE>   1
                                                                    EXHIBIT  4.6


           Registration Rights Agreement dated as of April 13, 1998



                        REGISTRATION RIGHTS AGREEMENT

                 THIS REGISTRATION RIGHTS AGREEMENT, dated as of April 13, 1998
(this "Agreement"), is made by and between NHANCEMENT TECHNOLOGIES, INC., a
Delaware corporation, with headquarters located at 39420 Liberty Street, Suite
250, Fremont, CA 94538 (the "Company"), and each entity named on a signature
page hereto (each, an "Initial Investor").

                            W I T N E S S E T H:

                 WHEREAS, upon the terms and subject to the conditions of the
Securities Purchase Agreement, dated as of April 13, 1998, between the Initial
Investor and the Company (the "Securities Purchase Agreement"; terms not
otherwise defined herein shall have the meanings ascribed to them in the
Securities Purchase Agreement), the Company has agreed to issue and sell to
each Initial Investor shares of Series A Convertible Preferred Stock, $.01 par
value per share, of the Company, in an aggregate purchase price (the "Purchase
Price") not exceeding $3,000,000 (the "Preferred Stock," which term, as used
herein shall have the meaning ascribed to it in the Securities Purchase
Agreement); and

                 WHEREAS, the Preferred Stock are convertible into shares of
Common Stock (the "Conversion Shares") upon the terms and subject to the
conditions contained in the Certificate of Designations; and

                 WHEREAS, to induce the Initial Investor to execute and deliver
the Securities Purchase Agreement, the Company has agreed to provide certain
registration rights under the Securities Act of 1933, as amended, and the rules
and regulations thereunder, or any similar successor statute (collectively, the
"Securities Act"), with respect to the Conversion Shares;

                 NOW, THEREFORE, 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 Initial Investor hereby agree as follows:

         1.      DEFINITIONS.

         (a)     As used in this Agreement, the following terms shall have the
following meanings:
<PAGE>   2
                 (i)      "Investor" means the Initial Investor and any
permitted transferee or assignee who agrees to become bound by the provisions
of this Agreement in accordance with Section 9 hereof.

                 (ii)     "Potential Material Event" means any of the
following: (a) the possession by the Company of material information not ripe
for disclosure in a registration statement, which shall be evidenced by
determinations in good faith by the Board of Directors of the Company that
disclosure of such information in the registration statement would be
detrimental to the business and affairs of the Company; or (b) any material
engagement or activity by the Company which would, in the good faith
determination of the Board of Directors of the Company, be adversely affected
by disclosure in a registration statement at such time, which determination
shall be accompanied by a good faith determination by the Board of Directors of
the Company that the registration statement would be materially misleading
absent the inclusion of such information.

                 (iii)    "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 under
the Securities Act or any successor rule providing for offering securities on a
continuous basis ("Rule 415"), and the declaration or ordering of effectiveness
of such Registration Statement by the United States Securities and Exchange
Commission (the "SEC").

                 (iv)     "Registrable Securities" means the Conversion Shares.

                 (v)      "Registration Statement" means a registration
statement of the Company under the Securities Act.

         (b)     Capitalized terms used herein and not otherwise defined herein
shall have the respective meanings set forth in the Securities Purchase
Agreement.

         2.      REGISTRATION.

         (a)     MANDATORY REGISTRATION.  The Company shall prepare and file
with the SEC, as soon as possible after the Closing Date but no later than
twenty-one (21) days following the Initial Closing Date, either a Registration
Statement on Form S-3 or an amendment to an existing Registration Statement, in
either event registering for resale by the Investor a sufficient number of
shares of Common Stock for the Initial Investors to sell the Registrable
Securities (or such lesser number as may be required by the SEC, but in no
event less than two hundred  percent (200%) of the aggregate number of shares
into which the Initial Preferred Stock and the Additional Preferred Stock
would be convertible  at the time of filing of such Registration Statement
(assuming for such purposes that the maximum Additional Preferred Stock had
been issued at such date and that all Preferred Stock had been eligible to be
converted, and had been converted, into Conversion Shares in accordance with
their terms, whether or not such issuance,
<PAGE>   3
eligibility or conversion had in fact occurred as of such date).  The
Registration Statement (i) shall include only the Registrable Securities and
150,000 shares of Common Stock held by the Stockholder (as defined in and as
contemplated by the last paragraph of EXHIBIT 1 annexed hereto) and (ii) shall
also state that, in accordance with Rule 416 and 457 under the Securities Act,
it also covers such indeterminate number of additional shares of Common Stock
as may become issuable upon conversion of the Preferred Stock resulting from
adjustment in the Conversion Price or to prevent dilution resulting from stock
splits, or stock dividends. The Company will use its reasonable best efforts to
cause such Registration Statement to be declared effective no later than the
earlier of (x) five (5) days after notice by the SEC that it may be declared
effective or (y) sixty (60) days after the Initial Closing Date. If at any time
the number of shares of Common Stock into which the Preferred Stock may be
converted exceeds the aggregate number of shares of Common Stock then
registered, the Company shall, within ten (10) business days, either (i) amend
the Registration Statement filed by the Company pursuant to the preceding
provisions of this Section 2, if such Registration Statement has not been
declared effective by the SEC at that time, to register all shares of Common
Stock into which the Preferred Stock may currently or in the future be
converted, or (ii) if such Registration Statement has been declared effective
by the SEC at that time, file with the SEC an additional Registration Statement
on Form S-3 or other appropriate form  to register the shares of Common Stock
into which the Preferred Stock may currently or in the future be converted that
exceed the aggregate number of shares of Common Stock already registered.

         (b)     PAYMENTS BY THE COMPANY.

                 (i)      If the Registration Statement covering the
Registrable Securities is not filed in proper form with the SEC within
twenty-one (21) days after the Initial Closing Date (the "Required Filing
Date"), the Company will make payment to the Initial Investor in such amounts
and at such times as shall be determined pursuant to this Section 2(b).

                 (ii)     If the Registration Statement covering the
Registrable Securities is not effective (a) within the earlier of (1) five (5)
days after notice by the SEC that it may be declared effective  or (2) sixty
(60) days following the Initial Closing Date (the "Required Effective Date"),
or (b) after a Suspension Period (as defined below), then the Company will make
payments to the Initial Investor in such amounts and at such times as shall be
determined pursuant to this Section 2(b).

                 (ii)     The amount (the "Periodic Amount") to be paid by the
Company to the Initial Investor shall be determined as of each Computation Date
(as defined below) and such amount shall be equal to (A) two percent (2%) of
the purchase price paid by the Initial Investor (the "Purchase Price") for all
Preferred Stock  purchased pursuant to the Securities Purchase Agreement for
the period from the date following the Required Filing Date or the  Required
Effective Date, as the case may be, to the first relevant Computation Date, and
(B) three percent (3%) to each Computation Date thereafter.  By





<PAGE>   4
way of illustration and not in limitation of the foregoing, if the Registration
Statement is timely filed but is not declared effective until one hundred
thirty-five (135) days after the Closing Date, the Periodic Amount will
aggregate eight percent (8%) of the Purchase Price of the Preferred Stock (2%
for days 61-90, plus 3% for days 91-120 and 3% for days 121-135).

                 (iv)     Each Periodic Amount will be payable by the Company
in cash or other immediately available funds to the Investor monthly, without
requiring demand therefor by the Investor.

                 (v)      The parties acknowledge that the damages which may be
incurred by the Investor if the Registration Statement is not filed by the
Required Filing Date or if the Registration Statement has not been declared
effective by the Required Registration Date may be difficult to ascertain.  The
parties agree that the Periodic Amount represent a reasonable estimate on the
part of the parties, as of the date of this Agreement, of the amount of such
damages.

                 (vi)     Notwithstanding the foregoing, the amounts payable by
the Company pursuant to this provision shall not be payable to the extent any
delay in the effectiveness of the Registration Statement occurs because of an
act of, or a failure to act or to act timely by the Initial Investor or its
counsel, or in the event all of the Registrable Securities may be sold pursuant
to Rule 144 or another available exemption under the Act.

                 (vii)    "Computation Date" means (i) the date which is the
earlier of (A) thirty (30) days after the Required Filing Date and the Required
Effective Date, as the case may be, or (B) the date after the Required Filing
Date or the Required Registration Date on which the Registration Statement is
filed (with respect to payments due as contemplated by Section 2(b)(i) hereof)
or declared effective (with respect to payments due as contemplated by Section
2(b)(ii) hereof), as the case may be, and (ii) each date which is the earlier
of (A) thirty (30) days after the previous Computation Date  or (B) the date
after the previous Computation Date on which the Registration Statement is
filed (with respect to payments due as contemplated by Section 2(b)(i) hereof)
or declared effective (with respect to payments due as contemplated by Section
2(b)(ii) hereof), as the case may be.

         3.      OBLIGATIONS OF THE COMPANY.  In connection with the
registration of the Registrable Securities, the Company shall do each of the
following.

                  (a)     Prepare promptly, and file with the SEC by the
Required Filing Date, a Registration Statement with respect to not less than
the number of Registrable Securities provided in Section 2(a) above, and
thereafter use its reasonable best efforts to cause each Registration Statement
relating to Registrable Securities to become effective by the Required
Effective Date and keep the Registration Statement effective at all times
during the period (the "Registration Period") continuing until the earliest of
(i) the date that is two (2) years  after the Initial Closing Date, (ii) the
date when the Investors may sell all Registrable Securities under Rule 144
without restriction or (iii) the date the Investors no longer own any of the
Registrable Securities, which Registration Statement (including any amendments
or supplements thereto and prospectuses contained therein) shall 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;





<PAGE>   5
                 (b)  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 keep the Registration effective at all times during the
Registration Period, and, during the Registration Period, 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 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;

                 (c)   The Company shall permit a single firm of counsel
designated by the Initial Investors to review the Registration Statement and
all amendments and supplements thereto a reasonable period of time (but not
less than three (3) business days) prior to their filing with the SEC, and not
file any document in a form to which such counsel reasonably objects.

                 (d)   Notify each Holder of Registrable Securities to be sold,
their Counsel and any managing underwriters immediately (and, in the case of
(i)(A) below, not less than five (5) days prior to such filing) and (if
requested by any such Person) confirm such notice in writing no later than one
(1) Business Day following the day (i)(A) when a Prospectus or any Prospectus
supplement or post-effective amendment to the Registration Statement is
proposed to be filed; (B) whenever the SEC notifies the Company whether there
will be a "review" of such Registration Statement; (C) whenever the Company
receives (or a representative of the Company receives on its behalf) any oral
or written comments from the SEC respect of a Registration Statement (copies
or, in the case of oral comments, summaries of such comments shall be promptly
furnished by the Company to the Holders); and (D) with respect to the
Registration Statement or any post-effective amendment, when the same has
become effective; (ii) of any request by the SEC or any other Federal or state
governmental authority for amendments or supplements to the Registration
Statement or Prospectus or for additional information; (iii) of the issuance by
the SEC of any stop order suspending the effectiveness of the Registration
Statement covering any or all of the Registrable Securities or the initiation
of any Proceedings for that purpose; (iv) if at any time any of the
representations or warranties of the Company contained in any agreement
(including any underwriting agreement) contemplated hereby ceases to be true
and correct in all material respects; (v) of the receipt by the Company of any
notification with respect to the suspension of the qualification or exemption
from qualification of any of the Registrable Securities for sale in any
jurisdiction, or the initiation or threatening of any Proceeding for such
purpose; and (vi) of the occurrence of any event that to the best knowledge of
the Company makes any statement made in the Registration Statement or
Prospectus or any document incorporated or deemed to be incorporated therein by
reference untrue in any material respect or that requires any revisions to the
Registration Statement, Prospectus or other documents so that, in the case of
the Registration Statement or the Prospectus, as the case may be, it will not
contain any untrue statement of a material fact or omit to state any 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.  In
addition, the Company shall furnish the Holders with copies of all intended
written responses to the comments contemplated in





<PAGE>   6
clause (C) of this Section 3(d) not later than one (1) Business Day in advance
of the filing of such responses with the SEC so that the Holders shall have the
opportunity to comment thereon.

                 (e)  Furnish to each Investor whose Registrable Securities are
included in the Registration Statement and its legal counsel identified to the
Company, (i) promptly after the same is prepared and publicly distributed,
filed with the SEC, or received by the Company, one (1) copy of the
Registration Statement, each preliminary prospectus and prospectus, and each
amendment or supplement thereto, and (ii) such number of copies of a
prospectus, and all amendments and supplements thereto and such other
documents, as such Investor may reasonably request in order to facilitate the
disposition of the Registrable Securities owned by such Investor;

                 (f)  As promptly as practicable after becoming aware of such
event, notify each Investor 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, and use its best efforts promptly to prepare a
supplement or amendment to the Registration Statement or other appropriate
filing with the SEC to correct such untrue statement or omission, and deliver a
number of copies of such supplement or amendment to each Investor as such
Investor may reasonably request;

                 (g)  As promptly as practicable after becoming aware of such
event, notify each Investor who holds Registrable Securities being sold (or, in
the event of an underwritten offering, the managing underwriters) of the
issuance by the SEC of a Notice of Effectiveness or any notice of effectiveness
or any stop order or other suspension of the effectiveness of the Registration
Statement at the earliest possible time;

                 (h)  Notwithstanding the foregoing, if at any time or from
time to time after the date of effectiveness of the Registration Statement, the
Company notifies the Investors in writing of the existence of a Potential
Material Event, the Investors shall not offer or sell any Registrable
Securities, or engage in any other transaction involving or relating to the
Registrable Securities, from the time of the giving of notice with respect to a
Potential Material Event until such Investor receives written notice from the
Company that such Potential Material Event either has been disclosed to the
public or no longer constitutes a Potential Material Event; provided, however,
that the Company may not so suspend the right to such holders of Registrable
Securities for more than two twenty (20) day periods in the aggregate during
any 12-month period ("Suspension Period") with at least a ten (10) business day
interval between such periods, during the periods the Registration Statement is
required to be in effect;

                 (i)   Use its  reasonable efforts to secure designation of all
the Registrable Securities covered by the Registration Statement on the "Small
Capitalization Market" of the National Association of Securities Dealers
Automated Quotations System





<PAGE>   7
("NASDAQ") within the meaning of Rule 11Aa2-1 of the SEC under the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), and the quotation of the
Registrable Securities on The NASDAQ SmallCap Market; or if, despite the
Company's reasonable efforts to satisfy the preceding clause, the Company is
unsuccessful in doing so, to secure NASDAQ/OTC Bulletin Board authorization and
quotation for such Registrable Securities and, without limiting the generality
of the foregoing, to arrange for at least two market makers to register with
the National Association of Securities Dealers, Inc. ("NASD") as such with
respect to such Registrable Securities;

                 (j)  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;

                 (k)  Cooperate with the Investors who hold Registrable
Securities being offered to facilitate the timely preparation and delivery of
certificates for the Registrable Securities to be offered pursuant to the
Registration Statement and enable such certificates for the Registrable
Securities to be in such denominations or amounts as the case may be, as the
Investors may reasonably request, and, within three (3) business days after a
Registration Statement which includes Registrable Securities is ordered
effective by the SEC, the Company shall deliver, and shall cause legal counsel
selected by the Company to deliver, to the transfer agent for the Registrable
Securities (with copies to the Investors whose Registrable Securities are
included in such Registration Statement) an appropriate instruction and opinion
of such counsel; and

                 (l)  Take all other reasonable actions necessary to expedite
and facilitate disposition by the Investor of the Registrable Securities
pursuant to the Registration Statement.

         4.      OBLIGATIONS OF THE INVESTORS.  In connection with the
registration of the Registrable Securities, the Investors shall have the
following obligations:

                 (a)      It shall be a condition precedent to the obligations
of the Company to complete the registration pursuant to this Agreement with
respect to the Registrable Securities of a particular Investor that such
Investor shall 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 shall be reasonably required to
effect the registration of such Registrable Securities and shall execute such
documents in connection with such registration as the Company may reasonably
request.  At least five (5) days prior to the first anticipated filing date of
the Registration Statement, the Company shall notify each Investor of the
information the Company requires from each such Investor (the "Requested
Information") if such Investor elects to have any of such Investor's
Registrable Securities included in the Registration Statement.  If at least two
(2) business days prior to the filing date the Company has not received the
Requested Information from an Investor (a "Non-Responsive Investor"), then the
Company may file the Registration Statement without including Registrable
Securities of such Non-Responsive Investor;





<PAGE>   8
                 (b)      Each Investor, by such Investor's acceptance of the
Registrable Securities, agrees to cooperate with the Company as reasonably
requested by the Company in connection with the preparation and filing of the
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; and

                 (c)      Each Investor agrees that, upon receipt of any notice
from the Company of the happening of any event of the kind described in Section
3(e) or 3(f), above, such Investor will immediately discontinue disposition of
Registrable Securities pursuant to the Registration Statement covering such
Registrable Securities until such Investor's receipt of the copies of the
supplemented or amended prospectus contemplated by Section 3(e) or 3(f) and, if
so directed by the Company, such Investor shall deliver to the Company (at the
expense of the Company) or destroy (and deliver to the Company a certificate of
destruction) all copies in such Investor's possession, of the prospectus
covering such Registrable Securities current at the time of receipt of such
notice.

         5.      EXPENSES OF REGISTRATION.

                 (a)  All reasonable expenses (other than underwriting
discounts and commissions of the Investor) incurred in connection with
registrations, filings or qualifications pursuant to Section 3, but including,
without limitation, all registration, listing, and qualifications fees,
printers and accounting fees, the fees and disbursements of counsel for the
Company and a fee for a single counsel for the Investor not exceeding $3,500,
shall be borne by the Company.

                 (b)      Except as and to the extent specifically set forth in
EXHIBIT 1 attached hereto, neither the Company nor any of its subsidiaries has,
as of the date hereof, nor shall the Company nor any of its subsidiaries, on or
after the date of this Agreement, enter into any agreement with respect to its
securities that is inconsistent with the rights granted to the Holders in this
Agreement or otherwise conflicts with the provisions hereof.  Except as and to
the extent specifically set forth in  EXHIBIT 1 attached hereto, neither the
Company nor any of its subsidiaries has previously entered into any agreement
granting any registration rights with respect to any of its securities to any
Person.  Without limiting the generality of the foregoing, without the written
consent of the Holders of a majority of the then outstanding Registrable
Securities, the Company shall not grant to any person the right to request the
Company to register any securities of the Company under the Securities Act
unless the rights so granted are subject in all respects to the prior rights in
full of the Holders set forth herein, and are not otherwise in conflict or
inconsistent with the provisions of this Agreement.

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





<PAGE>   9
                 (a)      To the extent permitted by law, the Company will
indemnify and hold harmless each Investor who holds such Registrable
Securities, the directors, if any, of such Investor, the officers, if any, of
such Investor, each person, if any, who controls any Investor within the
meaning of the Securities Act or the Exchange Act (each, an "Indemnified
Person" or "Indemnified Party"), against any losses, claims, damages,
liabilities or expenses (joint or several) incurred (collectively, "Claims") to
which any of them may become subject under the Securities Act, the Exchange Act
or otherwise, insofar as such Claims (or actions or proceedings, whether
commenced or threatened, in respect thereof) arise out of or are based upon any
of the following statements, omissions or violations in the Registration
Statement, or any post-effective amendment thereof, or any prospectus included
therein: (i) 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, (ii) any untrue statement or alleged untrue statement of a material
fact contained in the final prospectus (as amended or supplemented, if the
Company files any amendment thereof or supplement thereto with the SEC) 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 (iii) any violation or alleged
violation by the Company of the Securities Act, the Exchange Act, any state
securities law or any rule or regulation under the Securities Act, the Exchange
Act or any state securities law (the matters in the foregoing clauses (i)
through (iii) being, collectively, "Violations").  Subject to clause (b) of
this Section 6, the Company shall reimburse the Investors, 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 such Claim.  Notwithstanding anything to the contrary contained
herein, the indemnification agreement contained in this Section 6(a) shall not
(I) apply to a Claim arising out of or based upon a Violation which occurs in
reliance upon and in conformity with information furnished in writing to the
Company by or on behalf of 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(c) hereof;  (II) be available to
the extent such Claim is based on a failure of the Investor to deliver or cause
to be delivered the prospectus made available by the Company; or (III) apply to
amounts paid in settlement of any Claim if such settlement is effected without
the prior written consent of the Company, which consent shall not be
unreasonably withheld.  Each Investor will indemnify the Company and its
officers, directors and agents against any claims arising out of or based upon
a Violation which occurs in reliance upon and in conformity with information
furnished in writing to the Company, by or on behalf of such Investor,
expressly for use in connection with the preparation of the Registration
Statement, subject to such limitations and conditions as are applicable to the
Indemnification provided by the Company to this Section 6. Such indemnity shall
remain in full force and effect regardless of any investigation made by or on
behalf of the Indemnified Person and shall survive the transfer of the
Registrable Securities by the Investors pursuant to Section 9.





<PAGE>   10
                 (b)      Promptly after receipt by an Indemnified Person or
Indemnified Party under this Section 6 of notice of the commencement of any
action (including any governmental action), such Indemnified Person or
Indemnified Party shall, if a Claim in respect thereof is to be made against
any indemnifying party under this Section 6, deliver to the indemnifying party
a written notice of the commencement thereof and the indemnifying party shall
have the right to participate in, and, to the extent the indemnifying party so
desires, jointly with any other indemnifying party similarly noticed, to assume
control of the defense thereof with counsel mutually satisfactory to the
indemnifying party and the Indemnified Person or the Indemnified Party, as the
case may be.  In case any such action is brought against any Indemnified Person
or Indemnified Party, and it notifies the indemnifying party of the
commencement thereof, the indemnifying party will be entitled to participate
in, and, to the extent that it may wish, jointly with any other indemnifying
party similarly notified, assume the defense thereof, subject to the provisions
herein stated and after notice from the indemnifying party to such Indemnified
Person or Indemnified Party of its election so to assume the defense thereof,
the indemnifying party will not be liable to such Indemnified Person or
Indemnified Party under this Section 6 for any legal or other reasonable
out-of-pocket expenses subsequently incurred by such Indemnified Person or
Indemnified Party in connection with the defense thereof other than reasonable
costs of investigation, unless the indemnifying party shall not pursue the
action of its final conclusion.  The Indemnified Person or Indemnified Party
shall have the right to employ separate counsel in any such action and to
participate in the defense thereof, but the fees and reasonable out-of-pocket
expenses of such counsel shall not be at the expense of the indemnifying party
if the indemnifying party has assumed the defense of the action with counsel
reasonably satisfactory to the Indemnified Person or Indemnified Party. The
failure to deliver written notice to the indemnifying party within a reasonable
time of the commencement of any such action shall not relieve such indemnifying
party of any liability to the Indemnified Person or Indemnified Party under
this Section 6, except to the extent that the indemnifying party is prejudiced
in its ability to defend such action.  The indemnification required by this
Section 6 shall 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.

         7.      CONTRIBUTION.  To the extent any indemnification by an
indemnifying party is prohibited or limited by law, the indemnifying party
agrees to make the maximum contribution with respect to any amounts for which
it would otherwise be liable under Section 6 to the fullest extent permitted by
law; provided, however, that (a) no contribution shall be made under
circumstances where the maker would not have been liable for indemnification
under the fault standards set forth in Section 6; (b) no seller of Registrable
Securities guilty of fraudulent misrepresentation (within the meaning of
Section 11(f) of the Securities Act) shall be entitled to contribution from any
seller of Registrable Securities who was not guilty of such fraudulent
misrepresentation; and (c) contribution by any seller of Registrable Securities
shall be limited in amount to the net amount of proceeds received by such
seller from the sale of such Registrable Securities.





<PAGE>   11
         8.      REPORTS UNDER EXCHANGE ACT.  With a view to making available
to the Investors the benefits of Rule 144 promulgated under the Securities Act
or any other 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 ("Rule 144"), the Company agrees to:

                 (a)      make and keep public information available, as those
terms are understood and defined in Rule 144;

                 (b)      file with the SEC in a timely manner all reports and
other documents required of the Company under the Securities Act and the
Exchange Act; and

                 (c)      furnish to each Investor so long as such Investor
owns Registrable Securities, promptly upon 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 so
filed by the Company and (iii) such other information as may be reasonably
requested to permit the Investors to sell such securities pursuant to Rule 144
without registration.

                 9.       ASSIGNMENT OF THE REGISTRATION RIGHTS.  The rights to
have the Company register Registrable Securities pursuant to this Agreement
shall be automatically assigned by the Investors to any transferee of the
Registrable Securities (or all or any portion of any Preferred Stock of the
Company which is convertible into such securities) 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 (i) the name and
address of such transferee or assignee and (ii) the securities with respect to
which such registration rights are being transferred or assigned, (c)
immediately following 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, and (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.  In the event of any delay in
filing or effectiveness of the Registration Statement as a result of such
assignment, the Company shall not be liable for any damages arising from such
delay, or the payments set forth in Section 2(c) hereof. Any preceding
provision of this Section 9 to the contrary notwithstanding, no assignment to a
transferee contemplated by this Section 9 shall be for an amount less than the
lower of (x) ten percent (10%) of the Initial Investor's rights hereunder or
(y) one hundred percent (100%) of the rights hereunder then held by the
Investor.

                 10.      AMENDMENT OF REGISTRATION RIGHTS.  Any provision of
this Agreement may be amended and the observance thereof may be waived (either
generally or in a particular instance and either retroactively or
prospectively), only with the written consent of the Company and Investors who
hold an eighty (80%) percent interest of the Registrable Securities.  Any
amendment or waiver effected in accordance with this Section 10 shall be
binding upon each Investor and the Company.





<PAGE>   12
                 11.      MISCELLANEOUS.

                 (a)      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 shall act upon the basis of
instructions, notice or election received from the registered owner of such
Registrable Securities.

                 (b)      Notices required or permitted to be given hereunder
shall be in writing and shall be deemed to be sufficiently given when
personally delivered (by hand, by courier, by telephone line facsimile
transmission, receipt confirmed, or other means) or sent by certified mail,
return receipt requested, properly addressed and with proper postage pre-paid
(i) if to the Company, NHANCEMENT TECHNOLOGIES, INC., 39420 Liberty Street,
Suite 250, Fremont, CA 94538, ATTN: Chief Financial Officer, Telecopier No.:
(510) 744-4003; with a copy to Tomlinson Zisko Morosoli & Maser, 200 Page Mill
Road, 2nd Floor, Palo Alto, CA 94306, ATTN: Cindy Loe, Esq., Telecopier No.:
(650) 324-1808;  (ii) if to the Initial Investor, at the address set forth
under its name in the Securities Purchase Agreement, with a copy to Samuel
Krieger, Esq., Krieger & Prager, 319 Fifth Avenue, Third Floor, New York, NY
10016, Telecopier No.: (212) 213-2077; and (iii) if to any other Investor, at
such address as such Investor shall have provided in writing to the Company, or
at such other address as each such party furnishes by notice given in
accordance with this Section 11(b), and shall be effective, when personally
delivered, upon receipt and, when so sent by registered or certified mail, four
(4) calendar days after deposit with the United States Postal Service.

                 (c)      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, shall not operate as a waiver thereof.

                 (d)      This Agreement shall be governed by and interpreted
in accordance with the laws of the State of Delaware for contracts to be wholly
performed in such state and without giving effect to the principles thereof
regarding the conflict of laws.  Each of the parties consents to the
jurisdiction of the federal courts whose districts encompass any part of the
City of New York or the state courts of the State of New York sitting in the
City of New York in connection with any dispute arising under this Agreement
and hereby waives, to the maximum extent permitted by law, any objection,
including any objection based on forum non coveniens, to the bringing of any
such proceeding in such jurisdictions.

                 (e)      If any provision of this Agreement shall be invalid
or unenforceable in any jurisdiction, such invalidity or unenforceability shall
not affect the validity or enforceability of the remainder of this Agreement or
the validity or enforceability of this Agreement in any other jurisdiction.

                 (f)      Subject to the requirements of Section 9 hereof, this
Agreement shall inure to the benefit of and be binding upon the successors and
assigns of each of the parties hereto.

                 (g)      All pronouns and any variations thereof refer to the
masculine, feminine or neuter, singular or plural, as the context may require.

                 (h)      The headings in this Agreement are for convenience of
reference only and shall not limit or otherwise affect the meaning thereof.

                 (i)      This Agreement may be executed in one or more
counterparts, each of which shall be deemed an original but all of which shall
constitute one and the same agreement.  This Agreement, once executed by a
party, may be delivered to the other party hereto by telephone line facsimile
transmission of a copy of this Agreement bearing the signature of the party so
delivering this Agreement.

                 (j)      The Company acknowledges that any failure by the
Company to perform its obligations under Section 3(a) hereof, or any delay in
such performance could result in loss to the Investors, and the Company agrees
that, in addition to any other liability the Company may have by reason of such
failure or delay, the Company shall be liable for all direct damages caused by
any such failure or delay, unless the same is the result of force majeure.
Neither party shall be liable for consequential damages.

                 (k)      This Agreement constitutes the entire agreement among
the parties hereto with respect to the subject matter hereof.  There are no
restrictions, promises, warranties or undertakings, other than those set forth
or referred to herein.  This





<PAGE>   13
Agreement supersedes all prior agreements and understandings among the parties
hereto with respect to the subject matter hereof. This Agreement may be amended
only by an instrument in writing signed by the party to be charged with
enforcement thereof.

                 [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]





<PAGE>   14


                 IN WITNESS WHEREOF, the parties have caused this Agreement to
be duly executed by their respective officers thereunto duly authorized as of
the day and year first above written.
                                                                           
                                                                           
                                                                           
                                           COMPANY:                        
                                           NHANCEMENT TECHNOLOGIES, INC.   
                                                                           
                                                                           
                                           By:    /s/ Douglas S. Zorn 
                                              ----------------------------------
                                           Name:  Douglas S. Zorn          
                                           Title: Chief Financial Officer  
                                                                           
                                                                           
                                           INITIAL INVESTOR:               
                                           The Endeavour Capital Fund S. A.
                                                                           
                                                                           
                                           By:  /s/ Shmuli Margulies     
                                              ----------------------------------
                                           Name:  Shmuli Margulies         
                                           Title: Director   

                                           INITIAL INVESTOR:           
                                                                           
                                           AMRO INTERNATIONAL S. A.        
                                                                           
                                                                           
                                                                           
                                           By:      /s/ H. U. Bachofen   
                                              ----------------------------------
                                           Name:  H. U. Bachofen           
                                           Title: President and Director