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Retrieved from "http://wiki.openmoko.org/wiki/Virtual_buttons"
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I have seen a digital camera with this feature: the accelerameters can be used to detect small shocks on the case. If one taps his fingers on one corner of the device, a program can find where the tap was done and can interpret that like using a button. That way, it is possible to create virtual buttons on the device without making holes in it.

This can be useful for simple actions, like increasing/decreasing the volume, or so.