A robot is provided which is adapted to operate in association with an interface surface, which has disposed therein or thereon coded data indicative of an identity of the interface surface and of a plurality of reference points of the interface surface. The robot has movement means to allow the robot to move over the interface surface, a sensing device which senses at least some of the coded data and generates indicating data indicative of the identity of the interface surface and of a position of the robot on the interface surface, and communication means to transmit the indicating data to a computer system, which is programmed to select and execute a computer application based on at least the identity of the interface surface, and to receive movement instructions from the selected computer application. The behaviour of the robot is at least in part controlled by the selected computer application.