Need Help with Serial Port Communication in sending and receiving data

I am trying to write a program to send data thru a trasmitter which is connected to one of the serial port in the computer. I need to send AsCII character to the transmitter such that it will be Received by the receiver which will also be connected to the serial port in a different PC.

I do not have a lot of experience with C programming, can some one guide me as to how to send and receive data from a serial port and how can I send one byte at a time to the transmitter such that receiver will also recieve it in a same manner and store each byte in a file for latter use or for execution of different set of behaviors according to the ASCII character received.
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