Why not just limit the permitted logon hours for users with automatic logoff? This feature has been present in Windows since at least the NT4 domain model. See HOW TO: Limit User Logon Time in a Domain in Windows 2000, HOW TO: Limit User Logon Time in a Domain in Windows Server 2003, and How to limit a user's login hours on Windows NT
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There are two types of vessels, submarines and targets.
