Download Blue Lock
A product from the house of Wuul, this freeware utility is supported in Windows 2000/XP systems. This tool, basically, allows users to secure their system and lock out their computers once their Bluetooth phone or device is not within the specified range. It is built on open source Delphi programs and can use either the in-built Windows locking mechanism or even use a customized locking mechanism. Either ways, the tool automatically unlocks the computer as soon as the device comes back within the specific range. This tool is also small in size at 558.27K and can be easily installed and used.