“Essentially, BlueProximity works on the notion that most of us
carry around a Bluetooth device with us?our cell phone. Because
Bluetooth works only over a limited range, with a bit of tuning,
you can make some assumptions about how close a device is to your
computer based on the strength of its signal.BlueProximity works via these assumptions to decide when to lock
or unlock your screen. When you leave your computer, the Bluetooth
signal gets weaker until it crosses a threshold, and your desktop
is locked. When you return to your computer, the signal gets
stronger until it crosses a different threshold, and the computer
automatically unlocks.
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