Lock n Safe - Version 4.4.0 This small application works by restricting keyboard input and consequently preventing the user from switching tasks. The Ctrl-Esc, Alt-Tab, Alt-Ctrl-Del and hot keys commands are disabled while the password window is displayed. The keyboard will only work to enter your password. The mouse is locked in the password window once locked. Anyone trying to access the computer while Lock n Safe is loaded will not be able to bypass the password window.