Locking & Unlocking your PC with USB Flash drive it is able you to simple unlock your PC screen by Putting USB Device and with shortcut key you can again lock screen.
Do you want to secure your PC I think you would like to do it because now in these season every once having personal data on their Computers so security is must important issue mostly peoples use many alternate security systems and antivirus software but only that stuff are not enough for securing your Computer PC.
Here is one more slick way to secure computer screen you can lock your computer with USB drive means here are some resources with them you can create a unique passwords that will be stored only your flash drive when you will put USB drive then your PC will be unlock otherwise no one can get stuff or data into your PC.
Screen locker for PC available for both Operating Systems Microsoft Windows and Apple Mac.
1. Lock Windows Screen with USB Flash Device
The application’s interface comprises of Enable and Disable buttons to turn locking on/off, and a Setup button to register a USB flash drive. You can also enable/disable the application by right-clicking the system tray icon (default is enabled state).
2. USE USB Flash Device for Lock and Unlock for Mac
As I given a tool before but it was for Windows but now I shared a tool that support apple mac and available on ITunes it is very simple app you can use it for lock your screen when you put your usb device your screen will be unlock automatically but when you put out nothing happen you have to lock screen manually by running app any time or you can use shortcut key for that app and lock screen immediately.