Buck's method would only work if no one was currently in the database i.e.
prevent anyone else opening it.
Joseph's method certainly works, although can be time consuming. The
ldbviewer he mentioned is available for download. Since you are using 2000,
see
HOW TO: Check Who Logged into Database with Jet UserRoster in Access 2000 http://support.microsoft.com/default.aspx?scid=kb;en-us;198755