In a computer system, methods and computer-readable medium are disclosed for tracking motion of a subject in an activity captured by camera. In one embodiment of the method, an optical disc has a plurality of tracks. The panels fold onto their respective walls, the walls fold upwardly from the bottom, and the sides then fold and attach to the rear wall. A controller analyzes the signals from the read head to determine whether the magnetic ink markings are aligned with the treatment station. An armrest armature, an armrest and its assembly method and a motor vehicle seat. In an exemplary implementation of the invention, up to about 6720 concurrent VoIP calls can be supported in a single platform, with a latency of only about 17 msec ingress and 25 msec egress.