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I have a macbook pro. I would like to have my screen lock when I (my phone) moves away from the laptop. I'm sure third party solutions exist, but if I'd like to code something from scratch, what libraries or hooks should I be looking at?

+1  A: 

http://web.mac.com/jhollington/technocrat/The_Technocrat/Entries/2007/3/18_Bluetooth_Proximity_Detection_on_OS_X.html has a pretty good step-by-step on how to do a lot of this, although it's using an existing app. That app is open source though, so maybe this will help too? http://code.google.com/p/reduxcomputing-proximity/

durin42
Great. Thanks !