Hack and /: Automatically Lock Your Computer

"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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