Unlock Administrator

Unlock Administrator is a security configuration tool that allows a system administrator to specify exactly which users are allowed to unlock a Windows workstation.

A computer desktop can be locked in a number of ways including pressing the "Lock Computer" button from the "Ctrl-Alt-Del" menu or configuring Windows to automatically lock the system when the screensaver runs.
Unlock Administrator works in conjunction with Microsoft's Windows Graphical Identification and Authentication library (GINA) and uses Window's security system to authenticate users, which results in a seamless integration with Windows. In addition, Unlock Administrator does not store or manage user's passwords; any password policy mandated by Windows is inherently respected.