how do i send and recieve bytes form the USB port?

How can I access the USB port?
Presently i use the serial ports by calling WIN32 API call "CreateFile" to create a handle to the com1 and com2. Then "WriteFile" and "Readfile" to tx and rx bytes. It works but I need more speed.

Can i use this to talk to a usb port? If not what do I do?


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