Blue Lock scans for a particular Bluetooth device (e.g. the phone in your pocket) to detect when you are near your desk and locks your system if you move away.
Bluelock is an open source application that locks your Windows PC if a particular Bluetooth device is not detected. For example, if you register your Bluetooth mobile phone with the program but then move away from your desk, the program will detect your phone is out of range and automatically lock your system, requiring the password to be entered to reactivate the system. Full Delphi source code is provided.
Start Blue Lock, and after about half a minute a list of discovered Bluetooth devices will be displayed in the window on the right of the screen. Click on a device (you may have to wait a while as the GUI is frozen whilst the Bluetooth driver is scanning for devices - increase the timeout to increase the chances of discovering your device) and its ID and hardware address will be copied to the "Lock Device" field at the bottom of the screen.
The program will now loop continuously, and if that device is not detected the system will immediately lock up. The default locking mechanism is a standard Windows API call and is perfectly safe, it's just the same as if you locked the system with CTRL-ALT-DEL. There is an alternative locking mechanism which is documented below. In addition, you should also keep in mind that numerous Bluetooth devices have a long range so the application can still detect your device even when you go to the other end of the office!

The license of this software is Freeware, you can free download and free use this wireless communication software.