How to send data over COM ports?

I have one text file in this format.
A 100
B 200

Like this I have thousands of line of data.
Now I have an header and trailer for each message and I want to transfer each of this message as a complete packet over an COM2 port which is attached to an leased line.
Now I want to know how do u access a COM port and after successfull accessing how do I send messages over it. And also if I have to convert the data in binary how do I do it?
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arpit080399Author Commented:
Edited text of question.
What OS are you targetting?
I am asumming that you are using A windows platform. If you are all you have to do is use CreateFile and WriteFile, to file COMX where x is the number of the com port you want to write to.

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