Exhibit 4.4
                                   EXHIBIT B

                              SPECIMEN OF DEBENTURE

                           [FORM OF FACE OF SECURITY]

     THIS  SECURITY AND ANY COMMON STOCK  ISSUED ON  CONVERSION  HEREOF HAVE NOT
BEEN  REGISTERED  UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE  "SECURITIES
ACT"), OR ANY STATE SECURITIES  LAWS.  NEITHER THIS SECURITY NOR ANY INTEREST OR
PARTICIPATION  HEREIN MAY BE REOFFERED,  SOLD, ASSIGNED,  TRANSFERRED,  PLEDGED,
ENCUMBERED  OR  OTHERWISE  DISPOSED  OF IN THE ABSENCE OF SUCH  REGISTRATION  OR
UNLESS SUCH  TRANSACTION  IS EXEMPT  FROM,  OR NOT SUBJECT TO, THE  REGISTRATION
REQUIREMENTS  OF  THE  SECURITIES  ACT.  THE  HOLDER  OF  THIS  SECURITY  BY ITS
ACCEPTANCE  HEREOF AGREES TO OFFER,  SELL OR OTHERWISE  TRANSFER SUCH  SECURITY,
PRIOR TO THE DATE WHICH IS THREE YEARS AFTER (OR SUCH SHORTER  PERIOD UNDER RULE
144(k) UNDER THE SECURITIES ACT OR ANY SUCCESSOR RULE) THE LATER OF THE ORIGINAL
ISSUE DATE HEREOF AND THE LAST DATE ON WHICH VANSTAR CORPORATION (THE "COMPANY")
OR ANY  AFFILIATE  OF THE  COMPANY  WAS  THE  OWNER  OF  THIS  SECURITY  (OR ANY
PREDECESSOR OF THIS SECURITY) (THE "RESALE  RESTRICTION  TERMINATION DATE") ONLY
(A) TO THE COMPANY,  (B) PURSUANT TO AN EFFECTIVE  REGISTRATION  STATEMENT UNDER
THE  SECURITIES  ACT, (C) FOR SO LONG AS THE  SECURITIES ARE ELIGIBLE FOR RESALE
PURSUANT TO RULE 144A UNDER THE  SECURITIES  ACT ("RULE  144A"),  TO A PERSON IT
REASONABLY BELIEVES IS A "QUALIFIED INSTITUTIONAL BUYER" AS DEFINED IN RULE 144A
THAT  PURCHASES  FOR  ITS  OWN  ACCOUNT  OR  FOR  THE  ACCOUNT  OF  A  QUALIFIED
INSTITUTIONAL  BUYER TO WHOM NOTICE IS GIVEN THAT THE  TRANSFER IS BEING MADE IN
RELIANCE ON RULE 144A, (D) PURSUANT TO OFFERS AND SALES TO NON-U.S. PERSONS THAT
OCCUR  OUTSIDE THE UNITED  STATES  WITHIN THE MEANING OF  REGULATION S UNDER THE
SECURITIES ACT, (E) TO AN INSTITUTIONAL "ACCREDITED INVESTOR" WITHIN THE MEANING
OF  SUBPARAGRAPH  (a)(1),  (2), (3) OR (7) OF RULE 501 UNDER THE  SECURITIES ACT
THAT IS ACQUIRING  THE SECURITY FOR ITS OWN ACCOUNT,  OR FOR THE ACCOUNT OF SUCH
AN INSTITUTIONAL  "ACCREDITED  INVESTOR," FOR INVESTMENT PURPOSES AND NOT WITH A
VIEW TO, OR FOR OFFER OR SALE IN CONNECTION  WITH, ANY DISTRIBUTION IN VIOLATION
OF THE SECURITIES ACT, OR (F) PURSUANT TO ANOTHER  AVAILABLE  EXEMPTION FROM THE
REGISTRATION  REQUIREMENTS OF THE SECURITIES  ACT,  SUBJECT TO THE COMPANY'S AND
THE TRANSFER AGENTS RIGHT PRIOR TO ANY SUCH OFFER, SALE OR TRANSFER (i) PURSUANT
TO CLAUSES  (D),  (E) OR (F) TO REQUIRE  THE  DELIVERY OF AN OPINION OF COUNSEL,
CERTIFICATION AND/OR OTHER INFORMATION SATISFACTORY TO EACH OF THEM, AND (ii) IN
EACH OF THE FOREGOING  CASES,  TO REQUIRE THAT A CERTIFICATE  OF TRANSFER IN THE
FORM  APPEARING ON THIS SECURITY IS COMPLETED AND DELIVERED BY THE TRANSFEROR TO
THE  TRANSFER  AGENT.  THIS LEGEND WILL BE REMOVED  UPON THE REQUEST OF A HOLDER
AFTER THE RESALE RESTRICTION TERMINATION DATE.

                                     -1-





                               VANSTAR CORPORATION

                         6 3/4% Convertible Subordinated
                               Debenture due 2016

     No.________ $_________________ CUSIP No. VANSTAR CORPORATION, a corporation
duly  organized  and  existing  under the laws of the State of Delaware  (herein
called the "Company",  which terms include any successor  corporation  under the
Indenture hereinafter referred to) for value received, hereby promises to pay to
__________________________________________, or registered assigns, the principal
sum [indicated on Schedule A hereof]* [of ____________________________  Dollars]
($ ) on October 1, 2016.

Interest Payment Dates:       January 1, April 1, July 1 and October 1,
                              commencing January 1, 1997

Regular Record Dates:         the close of business on the Business Day
                              immediately preceding each Interest Payment Date,
                              except as otherwise provided in clause 4 set forth
                              on the reverse side of this Security

     Reference  is hereby made to the further  provisions  of this  Security set
forth on the reverse  hereof,  which further  provisions  shall for all purposes
have the same effect as if set forth at this place.

     Unless the  certificate of  authentication  hereon has been executed by the
Trustee  referred to on the reverse  hereof by manual  signature,  this Security
shall  not be  entitled  to any  benefit  under  the  Indenture  or be  valid or
obligatory for any purpose.



- -------------------
  * Applicable to Global Securities only.

 ** Applicable to certificated Securities only.


                                     -2-






     IN WITNESS  WHEREOF,  the Company has caused this  instrument  to be signed
manually or by facsimile by its duly authorized  officers and a facsimile of its
corporate seal to be affixed hereto or imprinted hereon.

Dated:


                              VANSTAR CORPORATION


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


[Seal]



Attest:


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


                     TRUSTEE'S CERTIFICATE OF AUTHENTICATION
    This is one of the Securities referred to in the within-mentioned Indenture.


Dated:                             WILMINGTON TRUST COMPANY,
                                   as Trustee


                              By:
                                 --------------------------------------------
                                   Authorized Signatory




                                     -3-





                         [FORM OF REVERSE OF SECURITY]

                               VANSTAR CORPORATION



                         6 3/4% Convertible Subordinated
                               Debenture due 2016*

          (i)  INTEREST.   Vanstar  Corporation,  a  Delaware  corporation  (the
"Company"),  is the issuer of this 6 3/4% Convertible Subordinated Debenture due
2016 (the "Security")  limited in aggregate principal amount to $180,412,350 (or
$207,474,200  if the  over-allotment  option  is  exercised),  issued  under the
Indenture  hereinafter  referred to. The Company promises to pay interest on the
Securities in cash from October 2, 1996 or from the most recent interest payment
date to which interest has been paid or duly provided for, quarterly (subject to
deferral for up to 20 consecutive  quarters as described in Section 3 hereof) in
arrears on  January  1,  April 1, July 1, and  October 1 of each year (each such
date, an "Interest Payment Date"),  commencing January 1, 1997, at the rate of 6
3/4% per annum  (subject to  increase  as  provided  in Section 12 hereto)  PLUS
Additional Interest,  Compound Interest and Liquidated Damages if any, until the
principal hereof shall have become due and payable.

     The amount of interest payable for any period will be computed on the basis
of a 360-day year of twelve 30-day  months.  Except as provided in the following
sentence,  the amount of  interest  payable for any period  shorter  than a full
quarterly period for which interest is computed will be computed on the basis of
the actual number of days elapsed.  In the event that any date on which interest
is payable on the Securities is not a Business Day, then payment of the interest
payable on such date will be made on the next succeeding day which is a Business
Day (without any interest or other payment in respect of any such delay), except
that, if such Business Day is in the next succeeding calendar year, such payment
shall be made on the immediately  preceding  Business Day, in each case with the
same force and effect as if made on such date.

          (ii) ADDITIONAL  INTEREST.  The Company shall pay to Vanstar Financing
Trust (and its  permitted  successors  or assigns  under the  Declaration)  (the
"Trust") such amounts as shall be required so that the net amounts  received and
retained  by the Trust  after  paying any taxes,  duties,  assessments  or other
governmental  charges of whatever nature (other than withholding  taxes) imposed
on the Trust by the United  States or any other  taxing  authority  ("Additional
Interest")  will be not less than the amounts the Trust would have  received had
no such taxes, duties, assessment or governmental charges been imposed.

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

     * All terms used in this Security  which are defined in the Indenture or in
the Declaration  attached as Annex A thereto shall have the meanings assigned to
them in the Indenture or the Declaration, as the case may be.

                                     -4-






          (iii) OPTION TO EXTEND INTEREST PAYMENT PERIOD. The Company shall have
the  right  at any time  during  the term of the  Securities  to defer  interest
payments  from  time  to time by  extending  the  interest  payment  period  for
successive  periods (each,  an "Extension  Period") not exceeding 20 consecutive
quarters for each such period;  PROVIDED,  no Extension Period may extend beyond
the maturity date of the Securities.  At the end of each Extension  Period,  the
Company shall be  responsible  for the payment of, and the Company shall pay all
interest then accrued and unpaid (including  Additional  Interest and Liquidated
Damages)  together  with  interest  thereon  compounded  quarterly  at the  rate
specified  for  the  Securities  to  the  extent  permitted  by  applicable  law
("Compounded Interest"); PROVIDED, that during any Extension Period, the Company
shall not, and shall not allow any of its Subsidiaries (other than, with respect
to clause (i) below only, its wholly owned  Subsidiaries) to, (i) declare or pay
dividends  on,  make  distributions  with  respect  to, or redeem,  purchase  or
acquire, or make a liquidation payment with respect to, any of its capital stock
(except for (1) dividends or  distributions  in shares of Common Stock on Common
Stock or on the  Preferred  Stock,  (2) purchases or  acquisitions  of shares of
Common Stock made in connection with any employee benefit plan of the Company or
its  subsidiaries  in the ordinary  course of business or pursuant to employment
agreements with officers or employees of the Company or its subsidiaries entered
into in the ordinary course of business,  provided that such  repurchases by the
Company  made from  officers or  employees  of the  Company or its  subsidiaries
pursuant to employment  agreements shall be made at a price not to exceed market
value on the date of any such  repurchase and shall not exceed $1 million in the
aggregate for all such employees and officers,  (3)  conversions or exchanges of
shares of Common  Stock of any one class into shares of Common  Stock of another
class or (4)  purchases  of  fractional  interests  in shares  of the  Company's
capital stock  pursuant to the  conversion or exchange  provisions of any of the
Company's  securities  being  converted or exchanged),  (ii) make any payment of
interest,  principal or premium, if any, on or repay,  repurchase or redeem, any
debt securities issued by the Company that rank junior to or PARI PASSU with the
Securities and (iii) make any guarantee  payments with respect to the foregoing.
Prior to the termination of any such Extension  Period,  the Company may further
extend such Extension Period; PROVIDED, that such Extension Period together with
all  previous  and  further  extensions  thereof  may not exceed 20  consecutive
quarters  and may not extend  beyond the  maturity of the  Securities.  Upon the
termination of any Extension Period and the payment of all amounts then due, the
Company may commence a new Extension Period,  subject to the above requirements.
No interest during an Extension Period, except at the end thereof,  shall be due
and payable.

     If the Property  Trustee is the sole holder of the  Securities  at the time
the Company  selects an Extension  Period,  the Company shall give notice to the
Regular Trustees,  the Property Trustee and the Trustee of its selection of such
Extension  Period at least one Business Day prior to the earlier of (i) the date
the  distributions  on the  Preferred  Securities  are  payable  or  (ii) if the
Preferred Securities are listed on the New York Stock Exchange, Inc. ("NYSE") or
other stock exchange or quotation system, the date the Trust is required to give
notice  to the  NYSE or  other  applicable  self-regulatory  organization  or to
holders  of the  Preferred  Securities  on the  record  date  or the  date  such
distributions  are  payable,  but in any event not less than ten  Business  Days
prior to such record date.


                                     -5-





     If the  Property  Trustee is not the sole holder of the  Securities  at the
time the Company selects an Extension Period, the Company shall give the Holders
and the Trustee  notice of its  selection  of an  Extension  Period at least ten
Business Days prior to the earlier of (i) the next succeeding  Interest  Payment
Date or (ii) if the Preferred  Securities  are listed on the NYSE or other stock
exchange or quotation system, the date the Company is required to give notice to
NYSE or other  applicable  self-regulatory  organization  or to  holders  of the
Securities on the record or payment date of such related interest  payment,  but
in any event not less than two Business Days prior to such record date.

     The  quarter in which any notice is given  pursuant to the second and third
paragraphs  of  this  Section  3  shall  be  counted  as one of the 20  quarters
permitted in the maximum Extension Period permitted under the first paragraph of
this Section 3.

          (iv) METHOD OF PAYMENT.  The interest so payable,  and punctually paid
or duly  provided  for, on any Interest  Payment  Date will,  as provided in the
Indenture,  be paid to the  Person in whose name this  Security  (or one or more
Predecessor  Securities)  is  registered at the close of business on the regular
record date for such interest installment,  which shall be the close of business
on the Business Day immediately  preceding each Interest Payment Date; provided,
however,  that,  for so long as the  Securities  are  held by the  Trust  or the
Property  Trustee of the Trust, if any Preferred  Securities (or if the Trust is
liquidated  in  connection  with  Special  Event,  any  Securities)  are held in
certificated  form,  the Record Date for each Interest  Payment Date shall be 15
days  prior to such  Interest  Payment  Date (in each case,  a  "Regular  Record
Date").  Any such  interest not so  punctually  paid or duly  provided for shall
forthwith  cease to be payable to the Holder on such Regular Record Date and may
either  be paid to the  Person  in  whose  name  this  Security  (or one or more
Predecessor  Securities)  is  registered  at the close of  business on a Special
Record  Date  for the  payment  of such  Defaulted  Interest  to be fixed by the
Trustee,  notice of which shall be given to Holders of Securities  not less than
10 days prior to such Special  Record Date,  or be paid at any time in any other
lawful manner not inconsistent with the requirements of any securities  exchange
on which the Securities  may be listed,  and upon such notice as may be required
by such exchange, all as more fully provided in said Indenture.

     Payment of the  principal of and interest on this  Security will be made at
the office or agency of the Company maintained for that purpose in New York, New
York, in such coin or currency of the United States of America as at the time of
payment is legal  tender for  payment of public  and  private  debts;  PROVIDED,
however, that, at the option of the Company,  payment of interest may be made by
check mailed to the address of the Person entitled thereto as such address shall
appear in the Security Register.

          (v) PAYING AGENT, SECURITY REGISTRAR AND CONVERSION AGENT. The Trustee
will act as Paying Agent,  Security  Registrar and Conversion Agent. The Company
may change any Paying  Agent,  Security  Registrar,  co-registrar  or,  with the
consent of the Trust,  Conversion Agent without prior notice. The Company or any
of its Affiliates may act in any such capacity.

                                     -6-






          (vi) INDENTURE.  The Company issued the Securities under an indenture,
dated  as of  October  2,  1996  (the  "Indenture"),  between  the  Company  and
Wilmington  Trust Company,  as Trustee (herein called the "Trustee",  which term
includes any successor trustee under the Indenture),  to which Indenture and all
indentures  supplemental thereto reference is hereby made for a statement of the
respective rights,  limitations of rights,  duties and immunities  thereunder of
the  Trustee,  the  Company  and the  Holders,  and of the terms  upon which the
Securities  are, and are to be,  authenticated  and delivered.  The terms of the
Securities  include  those  stated in the  Indenture  and those made part of the
Indenture  by  the  Trust   Indenture   Act  of  1939  (15  U.S.  Code  Sections
77aaa-77bbbb) ("TIA") as in effect on the date of the Indenture.  The Securities
are  subject  to,  and  qualified  by,  all such  terms,  certain  of which  are
summarized  hereon,  and Holders are referred to the Indenture and the TIA for a
statement of such terms. The Securities are unsecured general obligations of the
Company limited to $180,412,350 in aggregate  principal  amount (or $207,474,200
if the overallotment option is exercised).  No reference herein to the Indenture
and no provision of this Security or of the Indenture  shall alter or impair the
obligation  of the  Company,  which is absolute  and  unconditional,  to pay the
principal of and interest on this Security at the times,  place and rate, and in
the coin or currency,  herein prescribed or to convert this Security as provided
in the Indenture.

          (vii) OPTIONAL REDEMPTION.  The Securities are redeemable, in whole or
in part, at the Company's,  option at any time and from time to time on or after
October 5,  1999,  upon not less than 30 nor more than 60 days'  notice,  at the
following optional redemption prices (expressed as a percentage of the principal
amount of the  Securities)  if redeemed  during the  12-month  period  beginning
October 1 of the year shown below (October 5, in the case of 1999):

                                           Percentage of
                Year                   Principal Year Amount
                ----                   ---------------------
     2000. . . . . . . . . . . . . . . . . . 104.050%
     2001. . . . . . . . . . . . . . . . . . 103.375
     2002. . . . . . . . . . . . . . . . . . 102.700
     2003. . . . . . . . . . . . . . . . . . 102.025
     2004. . . . . . . . . . . . . . . . . . 101.350
     2005. . . . . . . . . . . . . . . . . . 100.675
     2006  and thereafter. . . . . . . . . . 100.000

plus, in each case, accrued and unpaid interest,  including Additional Interest,
Compounded  Interest and Liquidated  Damages, if any, to the Redemption Date. On
or after the Redemption  Date,  interest will cease to accrue on the Securities,
or portion thereof, called for redemption.

          (viii) OPTIONAL  REDEMPTION UPON TAX EVENT. The Securities are subject
to redemption in whole (but not in part), at any time within 90 days thereafter,
if a Tax Event (as defined in the Declaration) shall occur and be continuing, at
the applicable  redemption price set forth above (or, for the period  commencing
on the date of issuance of the Securities through October 4, 1997 and the twelve
month  periods  commencing  October 5, 1997 and October 5, 1998,  the product of
106.750%, 106.075% and 105.400%, respectively, times $50), in each case


                                     -7-






plus accrued but unpaid  interest,  including  Additional  Interest,  Compounded
Interest and Liquidated  Damages, if any, to the Redemption Date. Any redemption
pursuant  to this  Section 8 will be made upon not less than 30 nor more than 60
days' notice.

          (ix)  NOTICE OF  REDEMPTION.  Notice of  redemption  will be mailed at
least 30 days but not  more  than 60 days  before  the  Redemption  Date to each
Holder of the Securities to be redeemed at his address of record. The Securities
in  denominations  larger  than $50 may be redeemed in part but only in integral
multiples  of  $50.  In the  event  of a  redemption  of  less  than  all of the
Securities,  the  Securities  will be chosen for  redemption  by the  Trustee in
accordance with the Indenture. On and after the Redemption Date, interest ceases
to accrue on the Securities or portions of them called for  redemption.  If this
Security is redeemed  subsequent  to a Regular  Record Date with  respect to any
Interest  Payment Date specified above and on or prior to such Interest  Payment
Date,  then any accrued  interest  will be paid to the person in whose name this
Security is registered at the close of business on such record date.

          (x) REDEMPTION. The Securities will mature on October 1, 2016, and may
be redeemed, in whole or in part, at any time after October 5, 1999 as set forth
above or at any time in certain circumstances upon the occurrence of a Tax Event
as set forth above. Upon the repayment of the Securities, whether at maturity or
upon   redemption,   the  proceeds   from  such   repayment  or  payment   shall
simultaneously  be  applied  to redeem  Trust  Securities  having  an  aggregate
liquidation  amount  equal  to the  Securities  so  repaid  or  redeemed  at the
applicable  redemption  price  together  with  accrued and unpaid  distributions
through the date of redemption;  PROVIDED,  that holders of the Trust Securities
shall be given not less than 30 nor more than 60 days notice of such redemption.
Upon the  repayment  of the  Securities  at maturity  or upon any  acceleration,
earlier  redemption  or  otherwise,  the proceeds  from such  repayment  will be
applied to redeem the Preferred Securities,  in whole, upon not less than 30 nor
more than 60 days'  notice.  There are no sinking fund  payments with respect to
the Securities.

          (xi) CONVERSION. The Holder of any Security has the right, exercisable
at any time prior to the close of business  (New York time) on the  Business Day
immediately preceding the date of repayment of such Security whether at maturity
or upon  redemption  (either at the option of the  Company or  pursuant to a Tax
Event),  to convert the principal amount thereof (or any portion thereof that is
an integral  multiple of $50) into the number of shares of Common Stock obtained
by dividing  $50 per  Security by the  applicable  conversion  price  (initially
$28.75 per share of Common Stock for each Security)  (equivalent to a conversion
rate of 1.739  shares per share of Common  Stock of the Company  per  Security),
subject to adjustment under certain circumstances as set forth in the Indenture.

          To  convert  a  Security,  a  Holder  must  (1)  complete  and  sign a
conversion notice  substantially in the form attached hereto,  (2) surrender the
Security to a Conversion Agent, (3) furnish appropriate endorsements or transfer
documents if required by the Security  Registrar or Conversion Agent and (4) pay
any transfer or similar tax, if required.  Upon  conversion,  no  adjustment  or
payment will be made for interest or dividends,  but if any Holder  surrenders a
Security for  conversion  after the close of business on the Regular Record Date
for the payment of

                                     -8-





an  installment  of  interest  and prior to the  opening of business on the next
Interest  Payment Date,  then,  notwithstanding  such  conversion,  the interest
payable on such Interest  Payment Date will be paid to the registered  Holder of
such Security on such Regular Record Date. In such event,  such  Security,  when
surrendered  for  conversion,  need not be  accompanied  by payment of an amount
equal to the interest  payable on such  Interest  Payment Date on the portion so
converted.  The number of shares  issuable  upon  conversion  of a  Security  is
determined  by dividing the  principal  amount of the Security  converted by the
conversion price in effect on the Conversion Date. No fractional  shares will be
issued upon  conversion  but a cash  adjustment  will be made for any fractional
interest.  The Outstanding  principal amount of any Security shall be reduced by
the portion of the  principal  amount  thereof  converted  into shares of Common
Stock.

          (xii) REGISTRATION  RIGHTS.  The holders of the Preferred  Securities,
the  Securities,  the  Guarantee  and the shares of Common  Stock of the Company
issuable  upon  conversion of the  Securities  (collectively,  the  "REGISTRABLE
SECURITIES")  are entitled to the benefits of a Registration  Rights  Agreement,
dated as of  October  2,  1996,  among the  Company,  the Trust and the  Initial
Purchasers (the "Registration  Rights Agreement").  Pursuant to the Registration
Rights  Agreement,  the  Company  has agreed for the  benefit of the  holders of
Registrable  Securities that (i) it will, at its cost,  within 75 days after the
date of  issuance  of the  Registrable  Securities,  file a  shelf  registration
statement (the "Shelf Registration  Statement") with the Commission with respect
to  resales  of the  Registrable  Securities,  (ii) it will  use its  reasonable
efforts to cause, such Shelf Registration  Statement to be declared effective by
the  Commission  within 135 days after the date of issuance  of the  Registrable
Securities  and (iii) the Company  will use its  reasonable  efforts to maintain
such Shelf Registration  Statement  continuously  effective under the Securities
Act until the third anniversary of the  effectiveness of the Shelf  Registration
Statement  or  such  earlier  date as is  provided  in the  Registration  Rights
Agreement.  Reference  is  made  to  the  Registration  Rights  Agreement  for a
description   of,  among  other  things,   the   circumstances   under  which  a
"Registration  Default" may be declared if such Shelf Registration  Statement is
not filed or is not declared  effective  within a specified  period of time, and
additional  interest  "Liquidated  Damages"  may  accrue  and by  payable on the
Securities as a result of such a Registration Default.

          (xiii) REGISTRATION, TRANSFER, EXCHANGE AND DENOMINATIONS. As provided
in the  Indenture  and subject to certain  limitations  therein  set forth,  the
transfer  of  this  Security  is  registrable  in the  Security  Register,  upon
surrender of this Security for  registration of transfer at the office or agency
of the Company in New York, New York or Wilmington,  Delaware, duly endorsed by,
or accompanied by a written  instrument of transfer in form  satisfactory to the
Company and the Security  Registrar  duly  executed by, the Holder hereof or his
attorney duly  authorized in writing,  and thereupon one or more new Securities,
of authorized denominations and for the same aggregate principal amount, will be
issued to the designated transferee or transferees.

          The Securities are issuable only in registered form without coupons in
denominations of $50 and integral multiples thereof.  No service charge shall be
made for any such  registration  of  transfer or  exchange,  but the Company may
require  payment  of a sum  sufficient  to cover  any tax or other  governmental
charge payable in connection therewith. Prior



                                     -9-





to due presentment of this Security for  registration of transfer,  the Company,
the  Trustee and any agent of the Company or the Trustee may treat the Person in
whose name this  Security is  registered  as the owner hereof for all  purposes,
whether or not this  Security be overdue,  and neither the Company,  the Trustee
nor any such agent shall be affected by notice to the contrary.  In the event of
redemption  or  conversion  of this  Security  in part only,  a new  Security or
Securities for the  unredeemed or  unconverted  portion hereof will be issued in
the name of the Holder hereof upon the cancellation hereof.

          (xiv) PERSONS DEEMED  OWNERS.  Except as provided in Section 4 hereof,
the  registered  Holder  of a  Security  may be  treated  as its  owner  for all
purposes.

          (xv)  UNCLAIMED  MONEY.  If money  for the  payment  of  principal  or
interest remains unclaimed for two years, the Trustee and the Paying Agent shall
pay the money back to the Company at its written request. After that, holders of
Securities  entitled to the money must look to the Company for payment unless an
abandoned  property  law  designates  another  Person and all  liability  of the
Trustee and such Paying Agent with respect to such money shall cease.

          (xvi) DEFAULTS AND REMEDIES.  The Securities  shall have the Events of
Default  as set  forth in  Section  501 of the  Indenture.  Subject  to  certain
limitations in the  Indenture,  if an Event of Default occurs and is continuing,
the  Trustee  by  notice  to the  Company,  or the  holders  of at least  25% in
aggregate  principal amount of the then Outstanding  Securities by notice to the
Company and the Trustee,  may declare all the  Securities  to be due and payable
immediately.

     The  holders of a  majority  in  principal  amount of the  Securities  then
Outstanding by written notice to the Trustee may rescind an acceleration and its
consequences  if the rescission is prior to a judgment or decree for the payment
of the money due has been  obtained by the Trustee as provided in the  Indenture
and if all  existing  Events  of  Default  have  been  cured  or  waived  except
nonpayment of principal  and/or  interest that has become due solely  because of
the acceleration. Holders may not enforce the Indenture or the Securities except
as  provided  in the  Indenture.  Subject to certain  limitations,  holders of a
majority in principal amount of the then Outstanding Securities issued under the
Indenture  may direct the  Trustee in its  exercise  of any trust or power.  The
Company must furnish annually compliance  certificates to the Trustee. The above
description  of Events of Default and remedies is qualified by reference to, and
subject in its entirety by, the more complete  description  thereof contained in
the Indenture.

          (xvii)  AMENDMENTS,  SUPPLEMENTS AND WAIVERS.  The Indenture  permits,
with certain  exceptions  as therein  provided,  the  amendment  thereof and the
modification  of the rights and obligations of the Company and the rights of the
Holders of the Securities under the Indenture at any time by the Company and the
Trustee  with the consent of the Holders of a majority  in  aggregate  principal
amount of the  Securities at the time  Outstanding.  The Indenture also contains
provisions   permitting  the  Holders  of  specified  percentages  in  aggregate
principal  amount of the  Securities at the time  Outstanding,  on behalf of the
Holders of all the Securities,  to waive  compliance by the Company with certain
provisions of the  Indenture  and certain past defaults  under the Indenture and
their consequences. Any such consent or waiver by the Holder



                                     -10-





of this Security  shall be conclusive  and binding upon such Holder and upon all
future Holders of this Security and of any Security issued upon the registration
of transfer  hereof or in  exchange  herefor or in lieu  hereof,  whether or not
notation of such consent or waiver is made upon this Security.

          (xviii)  TRUSTEE  DEALINGS  WITH  THE  COMPANY.  The  Trustee,  in its
individual  or any  other  capacity  may  become  the  owner or  pledgee  of the
Securities and may otherwise deal with the Company or an Affiliate with the same
rights it would have, as if it were not Trustee,  subject to certain limitations
provided  for in the  Indenture  and in the TIA.  Any Agent may do the same with
like rights.

          (xix) NO RECOURSE  AGAINST OTHERS.  A director,  officer,  employee or
stockholder,  as such,  of the  Company  shall  not have any  liability  for any
obligations  of the Company  under the  Securities  or the  Indenture or for any
claim  based  on,  in  respect  of or by  reason  of such  obligations  or their
creation.  Each Holder of the  Securities  by  accepting  a Security  waives and
releases  all  such   liability.   The  waiver  and  release  are  part  of  the
consideration for the issue of the Securities.

          (xx) GOVERNING LAW. THE INDENTURE AND THE SECURITIES SHALL BE GOVERNED
BY AND  CONSTRUED IN  ACCORDANCE  WITH THE LAWS OF THE STATE OF NEW YORK WITHOUT
REGARD TO CONFLICT OF LAW PROVISIONS THEREOF.

          (xxi)  AUTHENTICATION.   The  Securities  shall  not  be  valid  until
authenticated by the manual signature of an authorized  signatory of the Trustee
or an authenticating agent.

          The Company will furnish to any Holder of the Securities  upon written
request and without charge a copy of the Indenture. Request may be made to:

          Vanstar Corporation
          5964 West Las Positas Boulevard
          Pleasanton, California 94588-9012
          Attention of: Chief Financial Officer
          Facsimile: (510) 734-0760



                                     -11-






                                 ASSIGNMENT FORM


     To assign this Security, fill in the form below:

     (I) or (we) assign and transfer this Security to

- -----------------------------------------------------------------------------
               (Insert assignee's social security or tax I.D. no.)
- -----------------------------------------------------------------------------
- -----------------------------------------------------------------------------
              (Print or type assignee's name, address and zip code)
and irrevocably appoint ___________________________________________________ 
agent to transfer this Security on the books of the Company.  The agent may 
substitute another to act for him.

                                   Your Signature:  ---------------------------
                                   (Sign exactly as your name appears on the
                                   other side of this Security)
                                   Date:
                                        -------------------------------------
                                   Signature Guarantee:*
                                                        ---------------------
[Include the following if the Security bears a Restricted Securities Legend --

In  connection  with any  transfer of any of the  Securities  evidenced  by this
certificate,  the undersigned confirms that such Securities are being: CHECK ONE
BOX BELOW

     (1)  / /      exchanged for the undersigned's own account without transfer;
                   or

     (2)  / /      transferred pursuant to and in compliance with Rule 144A
                   under the Securities Act of 1933; or
- -------------------
     *    Signature must be guaranteed by a commercial bank, trust company or
          member firm of the NYSE.








     (3)  / /      transferred pursuant to and in compliance with Regulation S
                   under the Securities Act of 1933; or

     (4)  / /      transferred pursuant to another available exemption from the
                   registration requirements of the Securities Act of 1933; or
     (5)  / /      transferred pursuant to an effective Shelf Registration
                   Statement.

Unless one of the boxes is checked,  the Trustee  will refuse to register any of
the  Securities  evidenced by this  certificate  in the name of any person other
than the registered Holder thereof; PROVIDED, HOWEVER, that if box (3) or (4) is
checked, the Trustee may require,  prior to registering any such transfer of the
Securities  such legal  opinions,  certifications  and other  information as the
Company has  reasonably  requested to confirm  that such  transfer is being made
pursuant  to an  exemption  from,  or  in a  transaction  not  subject  to,  the
registration  requirements  of the Securities Act of 1933, such as the exemption
provided by Rule 144 under such Act.

                                   ------------------------------------------
                                   Signature
Signature Guarantee:*

- -----------------------------      ------------------------------------------] 
Signature must be guaranteed       Signature

 
- -----------------------------------------------------------------------------
             [TO BE COMPLETED BY PURCHASER IF (2) ABOVE IS CHECKED.

     The undersigned represents and warrants that it is purchasing this Security
for its own  account  or an account  with  respect  to which it  exercises  sole
investment  discretion  and  that  it  and  any  such  account  is a  "qualified
institutional buyer" within the meaning of Rule 144A under the Securities Act of
1933,  and is aware that the sale to it is being made in  reliance  on Rule 144A
and acknowledges that it has received such information  regarding the Company as
the  undersigned  has requested  pursuant to Rule 144A or has  determined not to
request such  information  and that it is aware that the  transferor  is relying
upon the undersigned's foregoing representations in order to claim the exemption
from  registration  provided  by  Rule  144A.   

Dated:--------------------------       ---------------------------------------  

NOTICE:  To be executed by an executive officer.]  -------------------  * 
Signature  must be  guaranteed by a commercial bank, trust company or member 
firm of the NYSE.


                                     -2-




                      [TO BE ATTACHED TO GLOBAL SECURITIES]

                                   SCHEDULE A

     The initial  principal amount of this Global Security shall be $__________.
The  following  increases or decreases  in the  principal  amount of this Global
Security have been made:

 
                                                                                          
                        Amount of increase in
                         Principal Amount of
                         this Global Security                             Principal Amount of          Signature of
                            including upon       Amount of decrease in   this Global Security      authorized officer of
                          exercise of over-      Principal Amount of         following such        Trustee or Securities
   Date Made               allotment option      this Global Security     decrease or increase      Custodian
 
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                                     -3-






                               ELECTION TO CONVERT

To:  Vanstar Corporation

     The  undersigned  owner of this Security hereby  irrevocably  exercises the
option to convert this Security,  or the portion below  designated,  into Common
Stock of  Vanstar  Corporation  in  accordance  with the terms of the  Indenture
referred  to in  this  Security,  and  directs  that  the  shares  issuable  and
deliverable upon  conversion,  together with any check in payment for fractional
shares,  be issued in the name of and  delivered  to the  undersigned,  unless a
different name has been indicated in the assignment  below.  If shares are to be
issued in the name of a person other than the undersigned,  the undersigned will
pay all transfer taxes payable with respect thereto.

     Any holder,  upon the exercise of its conversion  rights in accordance with
the terms of the Indenture and the Security,  agrees to be bound by the terms of
the  Registration  Rights  Agreement  relating to the Common Stock issuable upon
conversion of the Securities.

Date:
      ---------------------

          in whole ___           Portions of Security to be in part
          in part  ___           converted ($50 or integral multiples
                                 thereof):

                              $
                               ----------------------------------------------
 
                               ----------------------------------------------
                               Signature (for conversion only)
                              Please Print or Typewrite Name and Address,
                              Including Zip Code, and Social Security or Other
                              Identifying Number
 
                               ----------------------------------------------
 
                               ----------------------------------------------
 
                               ----------------------------------------------
 
                               Signature Guarantee:*
                                                    -------------------------



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

     * Signature  must be  guaranteed  by a commercial  bank,  trust  company or
member firm of the New York Stock Exchange.