Limit User Concurrent connections in Windows 2003

I need to restrict my users to only be able to login on 1 machine at a time.  Does anyone know how I can go about doing this in Windows 2003 Server?  Restricting these users by limiting them to a certain machine is not an option since these users float from computer to computer. And I can't use Microsoft  LimitLogin utility since I have to modifiy the schema or any other third party application. Does anybody knows a way to do that through GPO or Vbs.
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You would have to either use a third party tool found here: or the LimitLogin using found on

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If you want them only to be able to log into one machine at a time, have a look at what tastas posted. If you wanted to make it to where a user can only log onto one specific machine:

open Active Directory Users and Computers --> Account tab --> Log On To --> enter machine name or names they are allowed to use. Not your solution, but as of yet, MS has not included this functionality.
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