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Which dev(/dev/usb*) for creative webcam?

Respected sir,
                     i am trying to open /dev/ttyUSB* in SUPERUSER mode(root). The /dev/ttyUSB* devices are also owned by root:uucp?  But i am not able to open it. open system call always returns -1as file descriptor.
i haven't installed device driver for the webcam device. is there any need to install the device driver and then accessing the devices or any other solution.
                    expecting your ideas.
                                                     Ashok Kumar B.

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