Need help Reading and writing to a Port

[Cplusstudent1]

im trying to make a program that can receive data from a port (ex. USB, Parallel) and then write back to it. i was wondering if anyone could help me out by point me in the right direction as of what to do. :-|

thanks

[i686-linux]

Not to hijack the thread, but if anyone knows of this in Pascal as well, that would be awesome.

[infamous]

google for 'i/o ports tutorial C'

[BountyX]

also search for 'USB Protocol'

[Cplusstudent1]

thank you very much!