how can i detect usb device?

when i insert a usb device ,how can i detect it and distinct it with other usb device by it's driver?

Don't know if this is what you want. But this company has a USBIO light kit for free to download. It comes with example source and documentation.

http://www.thesycon.de/usbio/eng/usbio.htm

thank u, but i did not catch what i want ... hehe