Lock & Unlock your system(PC) using USB:

 Lock & Unlock your system(PC) using USB: 

Do you want to lock & unlock your system with an USB pendrive? Yes, it is possible. You just need a free program named “PREDATOR USB” which will make your USB pendrive an access control device, i.e. a key for your system. When you leave your system, simply unplug your USB pendrive, your system will get locked and when you return, simply plug-in your USB pendrive, your system will get unlocked. It just a system locking method, but the main benefit is you don’t have to enter any password for this. Your USB pendrive is the password itself. When you will unplug your USB pendrive, your all program will get minimized and the screen will go dark, and when you will plug-in back, the screen will come again with your all programs.  
Download: http://predator-usb.com/predator/en/index.php