Think the only way you would be able to do this is to move to Named Cals. That way if they do give out their user name it can only be used by one person at a time, and if a second person logs in it kicks the first one off.
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The problem is I'm currently using several named cals and assigning one as a test to a username I created, but am still able to log on from two different machines each with unique IP addresses and each requesting logon details. Neither machine is getting booted off.