I think Greg's concept of  two concentric knobs and 4 large enough buttons on a console nearby wherever your hands naturally fall is a sound one. This is all predicated on having a system based on those controls and not requiring key input.

I often think about that when considering my IPAQ as a backup...
joke of the year "pen computing in mild turbulence"
Better have a hot key for every inflight function on the computer.
...Chrissi

 
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