If you need a log off feature for your network, check out Screen Pass. Screen Pass is a screen locking system for Windows® that extends the capability of the standard workstation lock and gives network administrators complete control over idle workstations. For example, it can be configured to make a user log off automatically when there has been no activity for a certain period of time or a defined time of the day. Screen pass can also be configured to require a user´s re-authentication after a set period of inactivity.
Screen Pass automatic logout action can also be set to logout, restart, shutdown, or powerdown. With this feature network administrators can control each workstation more efficiently and also save energy. To check all Screen Pass auto logoff features just click the link in this post.