bluetooth device for proximity detection

[Robin Wood <robin () digininja org>]

Hi
Has anyone set up their machines to auto-lock when they move away from
them using a bluetooth device? Seeing as I don't always take my phone
when I leave my desk I was wondering whether there were any other
devices that could be used for this, something small that could be
left in a pocket or on a belt loop. Ideally it would be a class 3 or 2
to keep the range short.

What software is good for this for OS X and Linux?

Robin
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