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All of the security devices I know of use tracking when the perp connects. All GPS units I know of fit in the PCMCIA slot or connect via cable allowing easy removal.
IN FACT I dont know of anything available that cant be disabled or removed in under 15 minutes of a criminal having his hands on it(if he knows it's there).
Someone may come out eventually with a Wi-Fi device that is part of the motherboard that stays on "emitting" a homing signal whenever the criminal passes a node but not soon I think. Such a device will use power and drain the computer battery much faster than normal because it will always be emitting a signal.
Some of the special built laptops made for the government have circuitry built it allowing them to track the computer, but they are so expensive that its impractical for personal use(in the area of $22,000 each!!). In fact the government has stopped using them and (usually) buys dell or IBM laptops($800-2,000 each ballpark).
IMO all you can do is use strong encryption, which is a hassle remembering a complex 8 to 16(or more) digit password, and mechanically attaching it to a big heavy object.
MAKE SURE that you backup all of your critical data to a device such as a usb memory key or a protable cd-rw, WHICH BTW is a good idea even if your computer isnt a high theft risk.
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