Automatically start virtual keyboard or virtual mouse when one is not detected

[Bryan Quigley]

I have this idea: http://brainstorm.ubuntu.com/idea/5231/
*Automatically start virtual keyboard or virtual mouse when one is not
detected *

   - No Keyboard, but mouse: start on-screen keyboard
   - No Mouse, but keyboard: enable numlock keys as mouse, alert user of how
   to turn on and off

I *think* it is bite-size enough that I could try implementing it.  I would
like suggestions on:

   - Where to put this logic
   - How to best get the info that no mouse/keyboard is plugged in

So far I have come up with "at gnome startup", and grep the Xorg.0.log, but
was wondering if there was a better way (and more supporting of KDE, XFCE,
login screens, etc)
Thanks,
Bryan Quigley
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