Problems on I/O communication through RS232 by MFC program?(urgent)

To all Experts,

I m conducting a project on the I/O communication by RS232 port programmed by Visual C++ MFC.I have read some source program but however, still make me confused on it.
actually the function I want to build is only need to read a string of character(about 20 characters)into my computer and can send out about 255 characters out the serial port.

One of the other point I m confusing at is the baud rate.
the buad rate I want to have is 115200 bps,however, I havent seen any source program containing this rate. Is it not allowed to use a such high rate in programming?

I think this is an easy question for all of you,
hope you can give me a kindly help
Thanks a lot!

Also I dont know much on CreateFile();
would u please give me a brief explanation on it?

It is urgent that my deadline of project is coming...
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