Abstract: A client computer system is suitable for connection to a data processing network having a controlling system. The controlling system is operable to issue a wake-up request to the client computer system. The wake-up request is issued by means of a wireless connection between the controlling system and the client computer system. The client computer system, on receipt of the wake-up request, powers itself on so as to allow normal operation of the client computer system.

Abstract: A computer system includes a communication means for connection to a remote computer and a position determination system for determining the physical position of the computer system. The communications means receives a request from the remote computer for the computer system to provide the physical position of the computer to the remote computer system via the communications means. The request from the remote computer may originate because the computer system has been stolen or mislaid by a user or it may originate because the computer system has inadvertently been allocated the same network identifier as another computer and the physical location of the computer system needs to be known so that the network identifier can be changed.