OT -> bit twiddling on a parallel port?

So, I got an interesting question the other day. I know a guy who wants to
programatically set the voltages on individual pins on a parallel port. (IE,
have a command for "set pin 5 to 2 volts" or "set pin 7 to 1 volt".
He wants to do this in windows, but I'm having no luck figuring this out on
any platform...

Ideas?

    --Mac

-- 
Julian "Mac" Mason                            mac@cs.hmc.edu
Computer Science '06                          (310)-882-8068
Harvey Mudd College
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