Warp wrote:
>   How about a simpler technology which is available today (and has been for
> quite many years): Eye tracking.

You can combine these. Decades ago I saw a technique where the screen had a 
number of letters each of which were either highlighted in turn, or which 
were flashing at different rates.  Which ever one you were looking at would 
make EEG signals in your visual cortex that could be correlated to the 
letters.  So you just look at the blinking letters and it spells out what 
you gaze at.

It was pretty cool.

-- 
Darren New, San Diego CA, USA (PST)
  "How did he die?"   "He got shot in the hand."
     "That was fatal?"
          "He was holding a live grenade at the time."

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