An apparatus for use in an electrographic position sensing system comprises an antenna system and a signal strength detector. The service agent monitors whether the sending conditions are met, and when the sending conditions have been satisfied, executes processing to send the entered message to the receiver’s portable telephone device of the communication partner that has been registered. In response to receiving the font subset, at least one existing glyph is repositioned in the extensible data structure and each received glyph of the received font subset is positioned in the extensible data structure. The mean-free-path-extending layer extends the mean free path of spin-up conduction electrons in the spin-valve thin-film magnetic element.