In tip 0296, we prevented a user from logging on more than once.

If you install CConnect.exe on each Windows 2000 / Windows NT 4.0 client, you can:

        Limit concurrent connections per user.                                      Log off remote computers when concurrent connections are reached.                                      List all computers that a user is logged on to.                                      List logon servers for each user.                                      Show how many users are logged on to a domain controller (DC).                                      Force a logoff when concurrent connections are reached.                                      Enable debugging of the CConnect tool.                                      Write events to the event log of a specified server concerning the status of the CConnect tool.                                      Save all lists to a file for further examination.                                      Track the last user of the computer and only limit that user from                                      logging on to the computer if the computer was shut down improperly.
Windows 2000 clients have no special requirements to run CConnect.exe. Windows NT 4.0 computers must have:
        Windows NT 4.0 Service Pack 3 or later must be installed.                                      Microsoft Data Access Components (MDAC) 2.0 must be installed.                                      Windows Scripting Host must be installed.                                      Web Based Enterprise Management (WBEM) must be installed.