USB drivers are different for different gadgets.
In one window usb port you can connect anything you want. But in windows 98 you have to install the driver of the particular hardware.
There can be no single common driver as e.g. you install printer on your usb driver then you need the printer driver CD of that particular brand of printer.
Again that software driver would be available on the CD which is coming with that printer.
you can remove that printer from same port and use pen drive which is different type of hardware and you need different driver files.
Again these file would come with the pen drive CD.

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