A second communication device is detected in proximity to a first communication device engaged in a call. The locking device includes a first case and a second case, both of which cover the second frame. The amount of money, time, andor game plays expires in predetermined portions over a plurality of defined expiration periods, thus encouraging a player to return to a casino during each of the predefined expiration periods. The electromechanical device operates in a normal mode and a protect mode. Rather than send all of the packages constituting the software bundle to each node, only the packages in the software bundle which are required by nodes below a certain link in the network are sent along that link, whereby to minimize the bandwidth required for transmitting the software bundle. A truncated lookup table provides a corresponding truncated thermometer code in response an address related to the N bit digital input.