EXHIBIT 2
         to SCHEDULE 13D


                         GENERAL ATLANTIC PARTNERS, LLC
                                3 Pickwick Plaza
                               Greenwich, CT 06830

                                                January 3, 2001


                                POWER OF ATTORNEY
                                -----------------

                  The undersigned, General Atlantic Partners, LLC, a Delaware
limited liability company, with its principal office at 3 Pickwick Plaza,
Greenwich, Connecticut, United States of America (the "Limited Liability
Company"), by its Executive Managing Member, Steven A. Denning, a U.S. citizen,
of full legal age, hereby constitutes and appoints Thomas J. Murphy, a U.S.
citizen, of full legal age, its true and lawful attorney-in-fact and agent, in
any and all capacities, to execute and deliver any and all documents and
instruments and to make any governmental filings on behalf of the Limited
Liability Company as fully to all intents and purposes as a Managing Member of
the Limited Liability Company might or could do in person, hereby ratifying and
confirming all that said attorney-in-fact may lawfully do or cause to be done.
This power of attorney shall expire on December 31, 2001.

                                   GENERAL ATLANTIC PARTNERS, LLC


                                   By:  /s/ Steven A. Denning
                                        ---------------------------------------
                                        Steven A. Denning
                                        Executive Managing Member


STATE OF CONNECTICUT    )
                        : ss.
COUNTY OF FAIRFIELD     )

                  On the 3rd day of January 2001, before me personally came
Steven A. Denning, to me known, and known to me to be the individual described
in, and who executed the foregoing document, and he acknowledged to me that he
executed the same.

/s/ Sheila Hughes
-----------------------------
Notary Public