Document:

<PAGE>

                                                                     Exhibit 4.3

                                  GUARANTEE OF
                     THE PNC FINANCIAL SERVICES GROUP, INC.

         FOR VALUE RECEIVED, THE PNC FINANCIAL SERVICES GROUP, INC. (formerly
known as PNC Bank Corp.), a corporation duly organized and existing under the
laws of the Commonwealth of Pennsylvania (herein called the "Guarantor"), hereby
unconditionally guarantees to the holder of the Security upon which this
Guarantee is endorsed the due and punctual payment of the principal and interest
on said Security, when and as the same shall become due and payable, whether by
declaration thereof or otherwise, according to the terms thereof and of the
Indenture referred to therein. In case of default by PNC Funding Corp (herein
called the "Company") in the payment of any such principal or interest, the
Guarantor agrees duly and punctually to pay the same.

         The Guarantor hereby agrees that its obligations hereunder shall be
absolute and unconditional, irrespective of, and shall be unaffected by, any
invalidity, irregularity or unenforceability of said Security or said Indenture,
any failure to enforce the provisions of said Security or said Indenture, or any
waiver, modification or indulgence granted to the Company with respect thereto,
by the holder of said Security or the Trustee under said Indenture or any other
circumstances which may otherwise constitute a legal or equitable discharge of a
surety or guarantor. The Guarantor hereby waives diligence, presentment, demand
of payment, filing of claims with a court in the event of a merger or bankruptcy
of the Company, any right to require a proceeding first against the Company,
protest or notice with respect to said Security or the indebtedness evidenced
thereby and all demands whatsoever, and covenants that this Guarantee will not
be discharged except by payment in full of the principal of and premium, if any,
and interest on said Security.

         The obligations of the Guarantor evidenced by this Guarantee, to the
extent and in the manner set forth in said Indenture, shall rank pari passu in
right of payment with each other and with the Guarantor's unsecured obligations
to holders of Senior Guarantor Indebtedness (as defined in said Indenture), and
are senior in right of payment to the Existing Guarantor Subordinated
Indebtedness (as defined in said Indenture), and each holder of Securities, by
the acceptance hereof, agrees to and shall be bound by such provisions of said
Indenture. The obligations of the Guarantor evidenced by this Guarantee shall
also rank pari passu in right of payment with the Guarantor's guarantees of the
Company's 6.95% Notes Due 2002, Floating Rate Senior Notes Due 2003, Floating
Rate Senior Notes Due 2004, 7.00% Notes Due 2004 and 5.75% Senior Notes Due
2006.

         The Guarantor shall be subrogated to all rights of the holder of said
Security against the Company in respect of any amounts paid by the Guarantor
pursuant to the provisions of this Guarantee; provided, however, that the
Guarantor shall not be entitled to enforce, or to receive any payments arising
out of or based upon, such right of subrogation until the principal of and
premium, if any, and interest then due on all Securities issued under said
Indenture shall have been paid in full.

<PAGE>

         This Guarantee shall not be valid or become obligatory for any purpose
until the certificate of authentication on the Security on which this Guarantee
is endorsed shall have been signed manually by the Trustee under the Indenture
referred to in said Security.

         All terms used in this Guarantee which are defined in the Indenture,
dated as of December 1, 1991, among the Company, the Guarantor and the
Manufacturers Hanover Trust Company, as Trustee (the term "Trustee" includes any
successor trustee under the Indenture), as amended by a Supplemental Indenture
dated as of February 15, 1993, by and among the Company, the Guarantor and
Chemical Bank (successor by merger to Manufacturers Hanover Trust Company and
now known as The Chase Manhattan Bank) ("Trustee"), and as further amended by a
Second Supplemental Indenture dated as of February 15, 2000, by and among the
Company, the Guarantor and the Trustee shall have the meanings assigned to them
in the Indenture.

                                -- END OF PAGE -
                      [signatures appear on following page]

                                      -2-
<PAGE>

         IN WITNESS WHEREOF, THE PNC FINANCIAL SERVICES GROUP, INC. has caused
this Guarantee to be duly executed by manual or facsimile signature under its
corporate seal or a facsimile thereof.

Dated:  October 30, 2001

                                      THE PNC FINANCIAL SERVICES GROUP, INC.

                                      By
                                         --------------------------------------
                                         Name:  Robert L. Haunschild
                                         Title: Senior Vice President and
                                                Chief Financial Officer

Attest:

--------------------------------
Name:  Thomas R. Moore
Title: Corporate Secretary

[SEAL]

                                      -3-<PAGE>
                                                                     EXHIBIT 4.1

<Table>
<S>                        <C>                                                                 <C>
  NUMBER                                                      [LOGO]                                             SHARES
                                                    THE ADVISORY BOARD COMPANY
                                       INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE

COMMON STOCK                                                                                            CUSIP 00762W 10 7
                                                                                               SEE REVERSE FOR CERTAIN DEFINITIONS
</Table>

THIS CERTIFIES THAT

IS THE OWNER OF

              FULLY PAID AND NONASSESSABLE SHARES OF COMMON STOCK,
                         PAR VALUE $0.01 PER SHARE, OF

-------------------------- THE ADVISORY BOARD COMPANY -------------------------

transferable on the books of the Corporation by the holder hereof or by duly
authorized attorney upon surrender of this Certificate properly endorsed. This
Certificate is not valid until countersigned by the Transfer Agent and
registered by the Registrar.

        Witness the facsimile seal of said Corporation and the facsimile
signatures of its duly authorized officers.

                           _                         _
                          | THE ADVISORY BOARD COMPANY|
                          |         CORPORATE         |
                          |            SEAL           |
                          |            2001           |
                          |          DELAWARE         |
                          |_                         _|

Dated:

[SIG]                                   [SIG]
CHIEF FINANCIAL OFFICER                 CHIEF EXECUTIVE OFFICER

                                               COUNTERSIGNED AND REGISTERED
                                                   FIRST UNION NATIONAL BANK
                                                                  TRANSFER AGENT
                                                                  AND REGISTRAR

                                               By

                                                            AUTHORIZED SIGNATURE

<PAGE>
                                                                     EXHIBIT 4.1

        The following abbreviations, when used in the inscription on the face
of this certificate, shall be construed as though they were written out in full
according to applicable laws or regulations:

<Table>
<S>                                                                     <C>
TEN COM   -- as tenants in common                                           UNIF GIFT MIN ACT--.............Custodian..............
TEN ENT   -- as tenants by the entireties                                                         (Cust)                (Minor)
JT TEN    -- as joint tenants with right                                                          under Uniform Gifts to Minors
             of survivorship and not as                                                           Act..............................
             tenants in common                                                                                  (State)

                                                                           UNIF GIFT TRF ACT--......Custodian (until age..........)
                                                                                                 (Cust)
                                                                                                 ...........under Uniform Transfers
                                                                                                   (Minor)
                                                                                                 to Minors Act.....................
                                                                                                                    (State)
</TABLE>

    Additional abbreviations may also be used though not in the above list.

For Value received,........................hereby, sell, assign and transfer
unto

PLEASE INSERT SOCIAL SECURITY OR OTHER
  IDENTIFYING NUMBER OF ASSIGNEE
--------------------------------------

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

 ............................................................................
     PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS INCLUDING POSTAL ZIP CODE OF
                                    ASSIGNEE

 ................................................................................

 ................................................................................

 .........................................................................Shares

of the Capital Stock represented by the within Certificate, and do hereby

irrevocably constitute and appoint..........................................

 ...................................................................... Attorney

to transfer the said stock on the books of the within named Corporation with

full power of substitution in the premises.

Dated...................

                                          X.....................................

                                          X.....................................
                                   NOTICE: THE SIGNATURE(S) TO THIS ASSIGNMENT
                                           MUST CORRESPOND WITH THE NAME(S) AS
                                           WRITTEN UPON THE FACE OF THE
                                           CERTIFICATE IN EVERY PARTICULAR
                                           WITHOUT ALTERATION ON ENLARGEMENT OR
                                           ANY CHANGE WHATEVER.

SIGNATURE(S) GUARANTEED:

BY_____________________________________________________________
THE SIGNATURE(S) MUST BE GUARANTEED BY AN ELIGIBLE GUARANTOR
INSTITUTION (BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS
AND CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED SIGNATURE
GUARANTEE MEDALLION PROGRAM), PURSUANT TO S.E.C. RULE 17Ad-15.

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00030-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00030-of-00352.parquet"}]]