Uses force sensing to detect multiple simultaneous touch surface 
contacts.
Useful for eg 'chording and bi-manual applications'.

For more normal keyboard applications one could imagine a two handed 
keyboard where a user used multiple fingers at once to achieve vast 
data input rates.

Resolution of 0.1" at 50 Hz are claimed.

        http://mrl.nyu.edu/~jhan/ftirtouch/

Ref Matthew McMahon

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