An improved access and retention system for sedans includes a protective cover for safeguarding a lower peripheral region of a rear cargo region while loading, unloading, and transporting cargo. When a communication-cable connection detector 48 detects a communication cable connection between a receiving apparatus 2 and the viewer 4, a control unit 49 switch controls a changeover switch 44 based on this connection detection, thereby switching a display of an LCD 41 to a display of image data from wire. Additionally, a voltage pump can supply operating voltage to the inverter to assist in overdriving the wordline. An optional locator plate may be utilized which is mounted over the ends of the bridge fittings in order to align the inlet and outlet ports of the fluid components with the inlet and outlet ends of the bridge fittings. The matrix can be used in separation methods, cell culturing, solid phase synthesis of organic molecules, and in catalytic reactions and other uses in which porous support matrices are used. The method further includes time-multiplexing transmission of the data to the transceivers in the group by applying the common Walsh code and the respective long code of each transceiver to data packets directed to the transceivers so as to form multiplexed data packets.