Hi
I m a new c language learner and want to control my PC using c language
and hence i need help from someone.

wishing for your help
"Sabbir"

 

You'll need to be more specific about what you're trying to do, the operating system you're using, and the kind of hardware you're using.

 

About all you could ever want
http://www.epanorama.net/circuits/parallel_output.html

A good relay board, look around for a good price though 40 is pretty good for this one.
http://www.electronickits.com/kit/complete/elec/ck1601.htm
I suspect the IC is nothing more than a UNL driver chip and that you just toggle the bits on an off to control them. In linux I think I could cause problems by using 'cat' to copy a large file to the parallel port.