Tracking the movement of individual wafers in a semiconductor processing system is improved by using an apparatus to axially rotate a wafer and using both the rotation angle and the wafer’s location in the processing system as tracking coordinates. The platform height preferably may be adjusted continuously rather than incrementally for precise and accurate positioning of a horse hoof or other animate or inanimate object. Each basket is \u201cside loading\u201d and the side loading aperture of each basket can be selectively covered by a slide retaining bar. The registration response message is sent to the MSCVLR that originated the registration message. The dispenser is connected to the barrel. On the base is a reversible fold down pole to assist the patient in raising and lowering themselves.