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After reading messages posted by Mark Levinson and Fred Jacobson, I
couldn't resist posting this little tidbit of information... Forgive me
if this is not relevant to the ongoing conversation.
I am currently taking a graduate level human computer interaction class,
and recently read an article about "the mole - a foot operated PC pointer
positioning device". I'll summarize the concept:
The user's right foot is connected to an X-Y positioning mechanism that
drives cursor movement. The right foot pedal also controls the Y fine
movement by the degree of tilt applied to the pedal. The user's left foot
is stationary and controls two switches(left and right mouse button) and a
cursor repositioning clutch (lifting the mouse off the pad).
If anyone would like to learn more, this study was published in the
Human Factors and Ergonomics Society 37th Annual
Meeting Proceedings, 1993. The authors are Anderson, Sobiloff, and White.