It's blatantly commercial, but does have enough info. to be worth a look,
imho. Motorola wanted/needed to work out a really-good method for entering
Chinese text into their cell. phones. A stylus and pad were out of the
question. Essentially, they converted the keypad into a touchpad, I'd say.
The scheme has further applications.
<http://www.motorola.com/mot/doc/5/5980_MotDoc.pdf>

Regards,

--
Nicholas Bodley /*|*\ Waltham, Mass.
Truthiness is the quality by which a person purports to know something
emotionally or instinctively, without regard to evidence or to what the
person might conclude from intellectual examination. Credit: Stephen
Colbert; see Wikipedia.