The simpliest solution would be to use the password feature of Windows screen saver.

Another approach will be to use a timer on your form. Set it to 3 minutes interval and call your log on form when it fire. You will need to reset the timer after each keystroke.

HTH

>Application for hospital laboratory that requires password for entry.
>If there is no "activity" for 3 min (for example) is there a way to program "cut out" to a level or screen that would again require a password for reentry?