Patent ID: 6957768

Claim:
A method of enabling a user to instruct a computer system to perform an operation via: an interface surface including an interface, the interface including visible graphical information and substantially invisible coded data, the coded data being indicative of the operation and an identity of the interface, the graphical information being indicative, to the user, of the operation; and a sensing device which, when placed by the user into an operative position relative to the interface surface to designate at least some of the graphical information, senses indicating data indicative of the operation using at least some of the coded data; a printer adapted to print the interface onto the interface surface; and a computer system adapted to communicate with the sensing device and the printer, the method including the steps of, in the computer system: receiving, from the user, a request to print the interface; instructing the printer to print the interface on the interface surface; receiving the indicating data from the sensing device; and performing the operation indicated by the indicating data.