How can i program parallel port output

I'm trying to get an old system with DOS and program in low level C to output bits through the parallel port. I'm getting a bit confused and overwhelmed when trying to look up information about parallel ports. I am used to working with the 68HC11, so would this be similar to that or will there be more things I must take care of? Also, Where should I start when attempting this?

 

Don't know much about it but some of This May help, especially the bottom one.

 

Thanks for the reply Wookie. I think i found the command outp(0x378,xxxx) which may work.