how to communicate with serial port using dll

How would I start my C++ program to communicate with a serial port?

can anyone give me a tutorial on that matter?

thank you.

Try the networking and device communication forum on this board. Also, go to www.godeguru.com and search the forums there, recently I saw a post asking the same thing (it will be about 5 or so pages back by now though). If your using borland C++ builder I _THINK_ theres an application project type you can make that does it.. I found a tutorial somewhere that had a walkthrough on how to do it.

Also, MSDN has some info about it, just search for serial port communication or something along those lines, shouldn't be too hard to find. Hope that helps!