tracking users login and logoff

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From: Christine (Christine_at_discussions.microsoft.com)
Date: 12/17/04 

Date: Thu, 16 Dec 2004 23:59:10 -0800

Is there a quick way ie a file that is already generated by XP to track an
users logon and logoff time? If there is not a file being generated are there
suggestions on how to start tracking user logon and logoff times?