A relay device is provided which is configured to relay data processed by a sensing device to a computer system and which has a memory storing an ID of the relay device, a first interface for receiving, from the sensing device, region data of an interactive surface and a sensing device ID, the region...http://www.google.com/patents/US20090279140?utm_source=gb-gplus-sharePatent US20090279140 - RELAY DEVICE FOR RELAYING DATA FROM A SENSING DEVICE TO A COMPUTER SYSTEM
