A method of tracking an identification device includes storing data about the identification device in a register, the data to be stored including data relating to a forwarding location to which requests for information about the identification device should be forwarded. The identification device is attached to an item to be monitored. The method includes accessing the register when the identification device has been read and a request for information has been received. Details of the forwarding location are obtained from the register. The request is forwarded to the forwarding location and the requested information about the identification device is sent from the forwarding location to a requester of the information.