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Great idea, but I don't want another fob. If it could be made to work with a phone then this would be perfect.

http://www.knocktounlock.com/ comes to mind.

Edit: Sorry, it appears Knock can't actually lock your Mac. Airlock promises that functionality though - so that might be of interest to you.

Thanks for contributing with that link :)

To be honest, i don't know the answer to that question either. But I'm guessing there's a good reason why they decided to provide the solution in this form.

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