COM1 and COM2 ports writing

How can I in C, write to the COM1/2 ports?
Is there a function? or something?

Can I do it with _outp(), if so, what is the address of the COM1 and COM2 ports?

Thanks.

I'm using the Borland 5.5 C++ compiler, and the win98/2000/XP OS.

Thanks.

I know ms-dos used some special filenames like lpt1 as fake filenames for printers. How involved was that? Was that just a ms-dos shell thing?

Its because its treated as a file, lpt1 and the COM ports

www.robbayer.com has a "tutorial" on connecting to serial ports (connecting to COM1, etc... works with this).