I found the following at
don't know if it's what you require.<br>
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Mickey.<br>
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Q. How can I stop a user logging on more than once?<br>
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A. There is no way in NT to stop a user logging on more than once, however it is possible to restrict a workstation so that only a certain user can login, and with this method each user would be tied to one workstation and thus could only logon once. <br>
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Logon to the Workstation as the Domain Administrator <br>
Start User Manager (Start - Administrative Tools - User Manager) <br>
Double click the Users group and select the Domain\Everyone and click remove <br>
Next click add and select the specific domain user and click Add <br>
Close User Manager <br>
Logoff and only that specific user will be able to logon (be careful that Administrators still include Domain\Administrators or you will not be able to logon) <br>
This solution is far from ideal, and it may be plausible to write a login script that checked if a user was currently logged on and if so, logoff straight away (using the logout command line tool).<br>
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