Editor: It' Magic. Really
Airlock allows your Mac to lock itself, plain and simple. Using your iPhone, Bluetooth® wireless technology, and a smidgen of Pixie dust, Airlock determines whether you're near your computer. When you leave the room - poof! - your Mac locks itself. “And when I come back?” You guessed it: your Mac unlocks. You can also customize Airlock to perform specific actions as you come and go - have your computer talk to you, log-in or out of iChat, walk the dog, and such.
Plan B. It's all good
While much of Airlock is certifiably magic, if your iPhone is dead or just isn't around, Airlock won't know what to do. But don't fret! Airlock can be configured to accept your user account password to unlock your Mac, just like in ye olden days.
No frills. 0g saturated fat.
Now you're asking: but how can all this cutting-edge technology possibly be easy to use? Airlock tucks away all the hairy details and leaves you with a clean and simple interface that's just as easy to use as the rest of your Mac. Airlock is configured through the System Preferences, and once set Up, runs completely in the background, hidden from sight.