Definition Sentry is a command-line utility that allows a network administrator the ability to keep users with out-of-date AV definitions from gaining access to the local area network. This is a handy tool for those with strict security policies. In conjunction with the Microsoft Server Resource Kit's logoff.exe tool, you can set your logon scripts to logoff users whose definitions are out-of-date. You will need to obtain logoff.exe from Microsoft separately..

Definition Sentry Main Features:

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Easy to use in batch files and logon scripts

Small executable size