A plurality of pairs of players play hands of Gin Rummy with identically arranged decks of cards. The rough topography is formed by creating cored contacts. The joining arrangement has a recessed female joining element formed in one of the outer ring of the isolation diaphragm and the header shell, and a protruding male joining element formed on the other one of the outer ring of the isolation diaphragm and the header shell, the male joining element received in the female joining element. Finally, the system displays the chronological log to the user in a manner which enables the user to use the usage-context information to access the functionality of the portable device.