EXHIBIT 3.6

                 CERTIFICATE OF DESIGNATIONS, PREFERENCES AND OTHER RIGHTS
                              OF THE SERIES B PREFERRED STOCK
                                    OF XIOX CORPORATION

                             Pursuant to Section 151(g) of the
                             Delaware General Corporations Law

     It is hereby certified that:

     V. The name of the corporation is Xiox Corporation (the  "Corporation"),  a
Delaware  corporation.

     VI. Set forth hereinafter is a statement of the voting powers, preferences,
limitations, restrictions, and relative rights of shares of Series B Convertible
Preferred Stock hereinafter designated as contained in a resolution of the Board
of  Directors  of the  Corporation  (the "Board of  Directors")  pursuant to the
authority   conferred  upon  the  Board  of  Directors  by  the  Certificate  of
Incorporation   of  the   Corporation,   as   amended   (the   "Certificate   of
Incorporation"),  and in accordance with Section 151(g) of the Delaware  General
Corporations Law, which resolution was duly adopted by the Board of Directors on
December 21, 1999, and remains in full force and effect as of the date hereof:

     SERIES B PREFERRED STOCK

     Section 1. Designation.  The series of Preferred Stock hereby created shall
be designated and known as the "Series B Preferred  Stock." The number of shares
constituting such series shall be 1,020,000.

     Section 2. Liquidation Rights.

          2.1  In  the  event  of  any  voluntary  or  involuntary  liquidation,
dissolution  or winding up of the  affairs of the  Corporation,  each  holder of
shares of Series B Preferred  Stock  shall be entitled to receive,  prior and in
preference  to the  payment  of any  liquidation  amount to the  holders  of the
Corporation's  common  stock,  par value  $0.01 per share  ("Common  Stock"),  a
payment  equal to $20.00  per share (the  "Purchase  Price")  together  with any
declared but unpaid dividends thereon, before any payment is made to the holders
of common stock (the "Preference  Amount").  After the full Preference Amount on
all  outstanding  shares of the Series B  Preferred  Stock has been paid and the
full  preferential  amount  payable  with  respect  to any other  shares  having
priority over the Common Stock has been paid, any remaining  funds and assets of
the Corporation  legally  available for  distribution  to stockholders  shall be
distributed  pro rata among the  holders of the Common  Stock.  The right of the
Series B Preferred Stock  stockholders to receive the Preference Amount shall be
on a parity  with the right of the  Series A  Preferred  Stock  stockholders  to
receive the  preferential  amount  specified in the Certificate of Designations,
Preferences,  and  Other  Rights  of  the  Series  A  Preferred  Stock.  If  the
Corporation has insufficient  assets to permit payment of the Preference  Amount
in full to all Series B  Preferred  Stock  stockholders,  then the assets of the
Corporation  shall  be  distributed  ratably  to the  holders  of the  Series  A



Preferred  Stock and the Series B  Preferred  Stock and the holders of shares of
any other  series of  Preferred  Stock on a parity  with the Series B  Preferred
Stock in proportion to the Preference Amount each such holder would otherwise be
entitled to receive.

          2.2 A  merger  or  consolidation  of the  Corporation,  or sale of the
Corporation's Common Stock (including, without limitation,  pursuant to a tender
offer) in any single transaction or series of related transactions,  in any such
case in which its  stockholders  do not retain a majority of the voting power in
the  surviving  corporation,   or  a  sale  of  all  or  substantially  all  the
Corporation's  assets, shall each be deemed to be a liquidation,  dissolution or
winding up of the Corporation.

     Section 3. Conversion.

          3.1 Voluntary Conversion.  Each share of Series B Preferred Stock will
be  convertible,  at the  option of the  holder  thereof,  at the  office of the
Corporation or any transfer agent for such shares, into Common Stock. The number
of shares of Common Stock into which each share of Series B Preferred Stock will
be converted  will be equal to the Purchase  Price of such share  divided by the
Conversion Price (as hereinafter  defined) of such share. The initial Conversion
Price for each share of Series B Preferred Stock shall be an amount equal to the
Purchase  Price  of such  share.  The  Conversion  Price  shall  be  subject  to
adjustment as provided in Section 3.3.

          3.2  Mechanics of  Conversion.  No  fractional  shares of Common Stock
shall be issued  upon  conversion  of Series B Preferred  Stock.  In lieu of any
fractional  shares  to  which  the  holder  would  otherwise  be  entitled,  the
Corporation  shall pay cash equal to such  fraction  multiplied by the then fair
market value of one share of Common  Stock,  as  reasonably  determined  in good
faith by the Board of Directors.  Before any holder of Series B Preferred  Stock
shall be entitled to receive  certificates for the shares of Common Stock issued
upon conversion, such holder shall surrender the certificate or certificates for
the shares of Series B Preferred Stock being  converted,  duly endorsed,  at the
principal  office of the  Corporation  and shall  state  therein its name or the
name,  or  names,  of its  nominees  in  which  it  wishes  the  certificate  or
certificates for shares of Common Stock to be issued.  The Corporation shall, as
soon as practicable thereafter,  issue and deliver at such office to such holder
of  Series  B  Preferred  Stock  or to such  holder's  nominee  or  nominees,  a
certificate  or  certificates  for the number of shares of Common Stock to which
such holder or such holder's  nominee  shall be entitled as aforesaid,  together
with cash in lieu of any  fraction  of a share of Common  Stock.  Subject to the
foregoing,  such  conversion  shall be deemed to have been made  immediately and
upon surrender of the certificate  representing the shares of Series B Preferred
Stock to be converted in the case of a voluntary  conversion pursuant to Section
3.1.  The  Person or Persons  entitled  to  receive  the shares of Common  Stock
issuable upon conversion  shall be treated for all purposes as the record holder
or holders of such shares of Common Stock on such date.

          3.3  Adjustments to Conversion  Price.  The Conversion  Price shall be
subject to adjustment from time to time as follows:



               (a) If the Corporation  shall issue shares of Common Stock to the
holders of Common Stock as a dividend or stock  split,  or in the event that the
Corporation  reduces  the  number of  outstanding  shares  of Common  Stock in a
reverse stock split or stock  combination,  then the  Conversion  Price shall be
adjusted  such that the  holders  of shares of Series B  Preferred  Stock  shall
receive,  upon conversion of the Series B Preferred Stock, that number of shares
of Common Stock that such holder would have owned following such dividend, stock
split,  reverse stock split or stock combination if such conversion had occurred
immediately  prior to the record  date for such  stock  split,  stock  dividend,
reverse stock split or stock  combination  of the Common Stock,  as the case may
be. If the  Corporation  shall issue  shares of Series B Preferred  Stock to the
holders of Series B Preferred  Stock as a stock  dividend or stock split,  or in
the event  that the  Corporation  reduces  the number of  outstanding  shares of
Series B Preferred Stock in a reverse stock split or stock combination, then the
Conversion  Price shall be  adjusted  such that the holder of shares of Series B
Preferred Stock shall receive,  upon conversion of the Series B Preferred Stock,
the number of shares of Common  Stock that such holder  would have owned if such
conversion  had  occurred  immediately  prior to the record  date for such stock
split, stock dividend,  reverse stock split or stock combination of the Series B
Preferred Stock, as the case may be. In the event of a reclassification or other
similar  transaction  as a result of which shares of Common Stock are  converted
into another  security,  then the Conversion Price shall be determined such that
the holders of shares of Series B Preferred Stock shall receive, upon conversion
of such Series B Preferred Stock, the number of such securities that such holder
would have owned  following  such  conversion  of the Common  Stock into another
security if such conversion had occurred immediately prior to the record date of
such reclassification or other similar transaction.  No adjustments with respect
to dividends  (other than stock  dividends) shall be made upon conversion of any
share of Series B Preferred Stock; provided,  however, that if a share of Series
B  Preferred  Stock  shall be  converted  subsequent  to the record date for the
payment of a dividend  (other than a stock  dividend) or other  distribution  on
shares  of  Series  B  Preferred  Stock  but  prior  to such  payment,  then the
registered  holder of such share at the close of  business  on such  record date
shall be entitled to receive the dividend (other than a stock dividend) or other
distribution  payable on such share on such date  notwithstanding the conversion
thereof or the  Corporation's  default in payment of the dividend  (other than a
stock dividend) due on such date.

               (b) Upon the issuance by the Corporation of Equity Securities (as
defined in Section  3.3(b)(ii)(A)  below) at a consideration per share less than
the Conversion Price of the Series B Preferred Stock in effect immediately prior
to the time of such issue or sale, other than an issuance of stock or securities
pursuant to Section  3.3(a) above or the issuance of shares of Common Stock upon
conversion of any shares of Series B Preferred  Stock,  then forthwith upon such
issue or sale, such Conversion Price shall be reduced to a price  (calculated to
the nearest hundredth of a cent) determined by dividing:

                    (i) an amount  equal to the sum of (x) the  number of shares
of Common Stock  outstanding  immediately prior to such issue or sale multiplied
by the Conversion Price in effect immediately prior to such adjustment,  (y) the
number of shares of Common Stock  issuable  upon  conversion  or exchange of any
obligations or securities of the Corporation  outstanding  immediately  prior to
such adjustment  multiplied by the Conversion Price in effect  immediately prior



to such  adjustment,  and (z) an amount  equal to the  aggregate  "consideration
actually received" by the Corporation upon such issue or sale; by

                    (ii)  the  sum of the  number  of  shares  of  Common  Stock
outstanding  immediately  after  such  issue or sale and the number of shares of
Common Stock  issuable upon  conversion or exchange of any such  obligations  or
securities of the Corporation outstanding immediately after such issue or sale.

                    For purposes of this Section 3.3(b),  the follow  provisions
shall be applicable:

                         (A)  The  term  "Equity  Securities"  as  used  in this
Section 3.3(b) shall mean any shares of Common Stock, or any obligation,  or any
share  of  stock  or  other  security  of the  Corporation  convertible  into or
exchangeable  for Common Stock,  except for shares of Common Stock or options to
purchase  Common Stock issued or granted to officers,  directors or employees of
the  Corporation and its  subsidiaries  either pursuant to any stock purchase or
stock  option  plan  or  other  incentive  stock  arrangement  approved  by  the
Corporation's Board of Directors.

                         (B) The case of an issue or sale for cash of  shares of
Common Stock, the "consideration  actually received" by the Corporation therefor
shall be deemed to be the amount of cash received,  before  deducting  therefrom
any commissions or expenses paid by the Corporation.

                         (C)  In  case  of the  issuance  (otherwise  than  upon
conversion  or exchange of  obligations  or securities  of the  Corporation)  of
additional  shares of  Common  Stock for a  consideration  other  than cash or a
consideration  partly other than cash,  the amount of  consideration  other than
cash received by the Corporation for such shares shall be deemed to be the value
of such consideration as determined in good faith by the Board of Directors.

                         (D) In case of the issuance by the  Corporation  in any
manner of any rights to subscribe for or to purchase  shares of Common Stock, or
any options for the purchase of shares of Common Stock or stock convertible into
Common Stock, all shares of Common Stock or stock  convertible into Common Stock
to which the  holders of such rights or options  shall be entitled to  subscribe
for or purchase pursuant to such rights or options shall be deemed "outstanding"
as of the date of the offering of such rights or the  granting of such  options,
as the case may be, and the minimum aggregate consideration named in such rights
or options for the shares of Common Stock or stock convertible into Common Stock
covered thereby, plus the consideration, if any, received by the Corporation for
such  rights  or  options,  shall be deemed  to be the  "consideration  actually
received" by the  Corporation  (as of the date of the offering of such rights or
the  granting  of such  options,  as the case may be) for the  issuance  of such
shares

                         (E)  In  case  of  the  issuance  or  issuances  by the
Corporation  in any  manner  of any  obligations  or of  any  securities  of the
Corporation that shall be convertible into or exchangeable for Common Stock, all
shares  of  Common  Stock  issuable  upon the  conversion  or  exchange  of such
obligations or securities shall be deemed issued as of the date such obligations
or  securities  are  issued,  and  the  amount  of the  "consideration  actually



received" by the Corporation for such additional shares of Common Stock shall be
deemed  to be the  total of (x) the  amount  of  consideration  received  by the
Corporation  upon the issuance of such  obligations or securities,  plus (y) the
minimum aggregate consideration,  if any, other than such obligations or shares,
receivable  by the  Corporation  upon such  conversion  or  exchange,  except in
adjustment of dividends.

                         (F) The amount of the "consideration actually received"
by the  Corporation  upon  issuance  of any  rights or  options  referred  to in
subsection (D) above or upon the issuance of any  obligations or securities that
are convertible or  exchangeable  as described in subsection (E) above,  and the
amount of the  consideration,  if any, other than such obligations or securities
so convertible or exchangeable, receivable by the Corporation upon the exercise,
conversion or exchange  thereof shall be determined in the same manner  provided
in subsections (B) and (C) above with respect to the  consideration  received by
the  Corporation  in case of the issuance of additional  shares of Common Stock;
provided,  however,  that if such  obligations  or securities so  convertible or
exchangeable  are issued in payment or  satisfaction  of any  dividend  upon any
stock  of  the  Corporation   other  than  Common  Stock,   the  amount  of  the
"consideration  actually received" by the Corporation upon the original issuance
of such obligations or securities so convertible or exchangeable shall be deemed
to be the value of such obligations or securities as of the date of the adoption
of the  resolution  declaring  such  dividend  as  determined  by the  Board  of
Directors  at or as of that  date.  On the  expiration  of any rights or options
referred to in subsection  (D), or the termination of any right of conversion or
exchange referred to in subsection (E), or any change in the number of shares of
Common  Stock  deliverable  upon  exercise  of such  options  or  rights or upon
conversion  or exchange of such  convertible  or  exchangeable  securities,  the
Conversion Price then in effect shall forthwith be readjusted to such Conversion
Price as would  have  obtained  had the  adjustments  made upon the basis of the
delivery of only the number of shares of Common Stock  actually  delivered or to
be delivered  upon the exercise of such rights or options or upon the conversion
or exchange of such securities.

                         (G)  In the  event  the  Corporation  shall  declare  a
distribution  payable in securities of other persons,  evidences of indebtedness
issued by the  Corporation  or other  persons,  assets or  options or rights not
referred to in this Section 3.3(b),  then, in each such case, the holders of the
Series B Preferred Stock shall be entitled to the distributions  provided for in
Section 4 below,  and no adjustment to the Conversion Price provided for in this
Section 3.3(b) shall be applicable.

          3.4 Common Stock  Reserved.  The  Corporation  shall  reserve and keep
available out of its authorized but unissued  Common Stock such number of shares
of Common Stock as shall,  at all times,  be  sufficient  for  conversion of all
outstanding Series B Preferred Stock.

     Section 4. Dividend Rights.

          4.1 Generally.  The holders of shares of Series B Preferred Stock will
be entitled to receive, if, when and as declared by the Board of Directors,  out
of any funds legally available therefor,  noncumulative dividends at the rate of
6% of the Purchase Price per share per annum  (appropriately  adjusted for stock



splits and combinations) for each share of Series B Preferred Stock then held by
them.  Such  dividends  may be payable  quarterly  or  otherwise as the Board of
Directors may from time to time  determine.  The right of the Series B Preferred
Stock stockholders shall be on a parity with the right of the Series A Preferred
Stock  stockholders  to receive the dividends  specified in the  Certificate  of
Designations,  Preferences  and other  Rights of the Series A  Preferred  Stock.
Dividends  may be declared  and paid upon  shares of Common  Stock in any fiscal
year of the  Corporation,  only if dividends shall have been paid to or declared
and set apart upon all shares of Series A  Preferred  Stock,  Series B Preferred
Stock,  and all shares of any other series of  Preferred  Stock on a parity with
the Series B Preferred Stock, at its annual rate for each quarter of such fiscal
year of the  Corporation,  including  the quarter in which such  dividends  upon
shares of Common Stock are declared.  No right shall accrue to holders of Series
B Preferred  Stock by reason of the fact that  dividends  on said shares are not
declared in any prior year, nor shall any undeclared or unpaid dividends bear or
accrue interest.

          4.2 Participation  with Common. If any dividend or other  distribution
payable in property  other than cash is declared on the Common Stock  (excluding
any dividend or other  distribution for which adjustment to the Conversion Price
is provided  by Section  3.3),  each  holder of Series B Preferred  Stock on the
record date for such  dividend or  distribution  shall be entitled to receive on
the date of payment or distribution of such dividend or other  distribution  the
same  property  that such holder would have received if on such record date such
holder was the holder of record of the number  (including  for  purposes of this
Section 4 any  fraction)  of shares of Common  Stock  into  which the  shares of
Series B Preferred Stock then held by such holder are convertible.

     Section 5. Voting Rights.

          5.1 Generally. Each holder of shares of Series B Preferred Stock shall
be entitled to the number of votes equal to the number of shares of Common Stock
into which such shares of Series B Preferred  Stock  could be  converted  on the
record date for the vote or consent of stockholders and shall have voting rights
and powers  equal to the voting  rights  and  powers of the  Common  Stock.  The
holders of shares of Series B Preferred Stock shall be entitled to notice of any
stockholders'  meeting in  accordance  with the Bylaws of the  Corporation  and,
except as provided in Section 5.2 below,  shall vote with  holders of the Common
Stock upon any matter submitted to a vote of stockholders,  except those matters
required by law to be submitted to a class vote.

          5.2 Series Vote. So long as any shares of Series B Preferred Stock are
outstanding,  the Corporation shall not, without first obtaining the approval by
vote or written  consent,  in the manner  provided  by law,  of the holders of a
majority of the total number of shares of Series B Preferred Stock  outstanding,
voting  separately  as a single  class:  (1) alter or change any of the  powers,
preferences,  privileges or rights of the Series B Preferred  Stock;  (2) create
any new  class or  series of shares  having  preferences  prior to the  Series B
Preferred Stock in any manner, including, without limitation, as to dividends or
liquidation;  (3) take any action that reclassifies any outstanding  shares into
shares having  preferences  prior to the Series B Preferred Stock in any manner,
including,  without limitation, as to dividends or liquidation;  or (4) alter or



change the Company's  Certificate  of  Incorporation  in a manner that adversely
affected the rights of the Series B Preferred Stock.

     Section 6. Redemption.

          6.1 Redemption Upon Certain Events.  Subject to any legal restrictions
on the Corporation's  redemption of shares,  beginning on the date of completion
of the earlier of the following  events (a) the consummation of the closing of a
public  offering  of  the  Corporation's  Common  Stock,  registered  under  the
Securities Act of 1933, as amended,  with gross  proceeds to the  Corporation in
excess  of $15  million  or (b) the  date on  which  the  closing  price  of the
Corporation's  Common Stock on the Nasdaq SmallCap Market exceeds $40/share each
day for a period of 15 consecutive  trading days, the  Corporation  may elect to
redeem all of the Series B  Preferred  Stock then  outstanding.  The  redemption
price for each share of Series B Preferred Stock shall be the Purchase Price for
such  share  plus all  declared  but  unpaid  dividends  thereon  to the date of
redemption, as adjusted for stock splits, stock dividends, recapitalizations and
the like.  Notwithstanding anything in the foregoing to the contrary, the holder
of any share of Series B Preferred  Stock may elect to convert  such share prior
to the date of redemption in accordance with Section 3 hereof.

          6.2 Notice. The Corporation shall give notice of any redemption of the
Series B  Preferred  Stock  pursuant  to  Section  6.1 by mailing a copy of such
notice not less than twenty (20) business days prior to the  redemption  date to
the holders of record of the Series B Preferred Stock (the "Redemption Notice").
The  Corporation  shall mail such notice to the  holders'  respective  addresses
appearing  on the  books of the  Corporation  or to the  addresses  given by the
holders to the Corporation for the purpose of such notice.

          6.3 Effect of Redemption. From and after the redemption,  unless there
has been a default in payment of the redemption price, all dividends, if any, on
the Series B Preferred  Stock redeemed shall cease to accrue,  all rights of the
holders of such shares (except the right to receive the redemption price without
interest upon surrender of their  certificate or certificates)  shall cease with
respect to such shares,  and such shares shall not  thereafter be transferred on
the books of this  Corporation  or be deemed to be  outstanding  for any purpose
whatsoever.  If the funds of the Corporation legally available for redemption of
shares on the  redemption  date are  insufficient  to redeem the total number of
shares of Series B Preferred Stock to be redeemed on such date, then those funds
that are legally  available shall be used to redeem the maximum  possible number
of the shares  ratably among the holders of the shares to be redeemed.  Series B
Preferred  Stock not redeemed shall remain  outstanding  and entitled to all the
rights and preferences provided herein.

     Section 7. Reservation of Rights. Pursuant to the authority vested in it by
the Certificate of Incorporation,  the Board of Directors  reserves the right to
designate  from time to time one or more  additional  series of Preferred  Stock
with powers, designations, preferences, and rights on a parity with or junior to
the Series B Preferred Stock.

     Section 8.  Notices.  In addition to any other notices to which the holders
of Series B Preferred  Stock may be  entitled  pursuant  to the  Certificate  of
Incorporation,  the Bylaws of the Corporation,  law, contract or otherwise,  the



Corporation  shall cause to be sent to each  holder all  written  communications
sent generally to the holders of Common Stock. The Corporation  shall cause such
communications  to be sent to holders of Series B Preferred  Stock  concurrently
with,  and in the same  manner as, the  sending  of such  communications  to the
holders of Common Stock.

            [The remainder of this page is intentionally left blank.]


     Signed on this 27th day of December, 1999.

                                       XIOX CORPORATION

                                       By:
                                           -------------------------------------
                                           William H. Welling
                                           Chief Executive Officer and President

ATTEST:

- --------------------------------
Melanie D. Johnson
Chief Financial Officer