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"Samsung looks to have found a solution to the small problem of adding some dedicated input buttons to a device that fills up its face with a touchscreen although, as you can see above, it's still on the drawing board. Samsung's answer, according to a recent patent application, is to use a sliding ruler that hovers over the screen and provides a touch pad for the most often used functions. That also has the added benefit of being able to divide the screen into two separate areas, which could apparently be adjusted at will depending on the application. Of course, there's no indication as to when such a device might become a reality but, as Unwired View points out, it's certainly possible we could be seeing one sooner rather than later.[Via Unwired View]"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2007/11/05/samsung-patent-application-reveals-touchscreen-ruler-interface/>