How to find out what computer a user logged in on.

From: Atlanta Thrashers Fan (no email)
Date: 04/21/05 

Date: 21 Apr 2005 14:43:01 -0500

     I need to know how to find out what computer a user logged in on.
I've looked in the Security Event Log, and I see there's a field for
it. But, there's no information in that field. It's almost always
blank.
     Also, how can I find out what computer(s) a user is currently
logged in on? I have the Windows 2000 Resource Kit, but I haven't
seen a tool in there that will tell me. Any help you can give is
greatly appreciated.