C Chat program

I am trying help a friend. He needs information to write a C program for 2 people to chat on 2 computers connected through the parallel port. Any help would be appreciated very much.
Thank You

I think you should learn a bit of socket programming to do something like that...

microsoft's winsock? I dunno about linux though.

it's easier to do this with assembly not only with parallel port but also with rs-232.