Frequently Asked Questions
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Q: Why do I not have the option to Lock Computer after pressing CTRL+ALT+DELETE?

A:

The computer must be a member of a domain for this feature to be present. If the computer is a member of a domain, the Windows Security dialog box opens. If the computer is not a member of a domain, the Windows Task Manager dialog box opens.

Windows XP Home Edition cannot join a domain, the Lock Computer option is not available to computers with that operating system.