Who's on that P.C.?!!!

Giganews Newsgroups
Subject: Who's on that P.C.?!!!
Posted by:  vidro (vid…@discussions.microsoft.com)
Date: Mon, 20 Mar 2006

Most good documentation should show this but is there any utility or method
of seeing who is logged on to a certain computer during the day.
My scenario;
A user gets a message while entering data that "database is locked by
computer XYZ"

From a remote system I would like to see who is signed into computer XYZ.