: I am a student doing my Engineering Project on a circuit that is able to send data to the computer thru a USB port. But how do i retreive the data coming in.
: I also need to know the file which activate the USB port, Input / Output Lib. File. so that my program can call that file ....
: I am using Visual Basic 6 to do my program

A non-HID USB device needs a driver which you have to write.
There you will get the GUID which you need to enumerate the instances of your device.
Best go to http://www.usb.org/forums/developers/webboard.html