Abstract: A tool used for interacting with a touch screen system is described. The tool is an object having multiple contact points that can contact the touch screen at multiple contact points simultaneously. The touch screen system detects the positions of the multiple contact points and matches a geometric pattern formed by the multiple contact points with pre-stored geometric patterns to recognize a virtual device. The touch screen system then performs appropriate functions defined for the recognized virtual device. An MCP (multiple contact point) mouse, an MCP fingertip, and an MCP key tool are described along with their use.

Abstract: A USB transmission system includes a transferring device for outputting connecting packet when the transferring device is electrically connected to a USB storage device for storing data in a first USB specification, and a server for receiving the connecting packet and accordingly outputting a request packet to the transferring device. The transferring device receives the request packet and accordingly outputs a first response packet in indicative of a second USB specification to the server. The first response packet indicates a device descriptor, and a configuration descriptor, of which the USB version defined in the device descriptor is set as the second USB specification, and the maximum packet size defined in the configuration descriptor is set as the speed of the second USB specification. The first USB specification complies with USB 1.1 specification, while the second USB specification complies with USB 2.0 specification.