One of the key aspects of the design is the mechanism by which users obtain the home page of a given exhibit in front of them. We used the approach that is standard in our Cooltown research, in which the user picks up an identifier by pointing his handheld device at the physical object of interest. This may be implemented by attaching an identifier on or near the object and installing a sensor in the PDA. Alternatively, the identifier token can be given to the user and the sensor attached to the object.