tnx for the reply

08)Can we read from a port while write to the same port? When we short the TX and Rx pins the value TX can be captured from the same port as a data read from port?

07)when file transfer between two computers, is there need to code two programmes for receiving data and transmitting data seperately?
If not how?please give me a code example…………?How...

06)How can we turn on and turn off the serial ports’ DTR and other pins………? When we transfer a file from one computer to another is there need to configure these pins or they are automatically...

04) what is the maximum data rate that a com port supports? Why we cannot transmit data than that (maximum ) data rate?

02)What are the purpose of drivers? I had heard this “as example: VGA drivers adjust voltages of VGA chips……” Is that correct? Is there any thing than that if u know please tell me……….. I m really...