From e-Motional.com Software:
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. By default, Windows only allows the current user to unlock the computer. An administrator can unlock the computer; however, the current session will be closed along with all the applications started by that user. As a result, any unsaved work is lost. Users often must resort to powering a system down to regain access. Unlock Administrator circumvents this problem by offering system administrators the flexibility of specifying which users can fully unlock a computer, as well as which users can unlock the computer forcing the current session to close.