Kerber - Version 1.1 Prevent unauthorized users from accessing your computer. Program disable system keys like Alt-Ctrl-Del or Alt-Tab or Ctrl-Esc or Win95 key (even disable the various function keys that modify the boot process, such as F5 and F8) until user don't type right password. Start with Windows or later, if your leave your computer for some time. Also if you setup BIOS password and change boot-up sequence in BIOS from A,C or C,A etc. to C only, nobody but you not be able to access to your system.