As far as I know, there is no difference between them on a standard
keyboard. The circuitry is designed to make them identical to the operating
system, thus the same signal is generated if you held down one or both.

Not true, the Mac OS (Classic and X) and Windows can tell the difference between the left and right keys (shift, control, alt/option and command)

http://developer.apple.com/technotes/tn2002/tn2056.html
(search for "right shift key")


http://gnufoo.org/ucontrol/
  From his FAQ:

"Is it possible to distinguish between the right and left Option and Command keys? Yes, it is possible (anything's possible) but, in short, the answer is no. The calls that uControl intercepts are at too high a level for it to distinguish between right and left keys. It might be possible to drag uControl down into a lower subsystem, but I don't envision myself doing it. Alex Harper, though, he's one you should watch."


-Sean

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