In general, the invention relates to methods and systems that record the location of a user and determine the corresponding physical named location visited by the user. The anti-mismatch is provided by members on the ends of the arcuate coupling segments which will nest when the proper coupling segments are brought together, but will be in an interference non-nested relationship when a mismatch is attempted. Upon receiving an input from a user of specifying a musical piece indicated by musical piece information displayed on a display device 10, a playback control unit 5 controls data of the specified musical piece so that the data of the specified musical piece is reproduced by the playback unit. A power cord portal allows a group of electrical power cords associated with the group of electrical appliances to enterexit the 3D interior volume in a bundled manner, and the appliance power plugs associated with said group of electrical appliances to be plugged into the electrical receptacles.