Antivirus Definition Sentry Cost: $20 Get the full version     Trial version     Developer's Website Contacting third-party download site please wait. If your download does not start, click here, or get the full version Descriptions Antivirus Definition Sentry: Definition Sentry is a command-line utility that allows a network administrator the ability to keep users with out-of-date AV definitions from gaining access to the local area network.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Microsoft Server Resource Kit's logoff.exe tool, you can set your logon scripts to logoff users whose definitions are out-of-date.