The file of this patent contains at least one drawing executed in color. The graphitized VGCF used in the present invention can be unidirectional VGCF or the VGCF having a three-dimensional linkage structure. The personalized term weighting for a given term or phrase can be used to store and access documents containing the corresponding term or phrase in the spatial file system and provides coordinates in a spatial file system, for one or more documents containing the corresponding term or phrase. In response to a change in the data rate reduction process, the source device further can transmit to the display device an indicator that identifies the current data rate reduction type and effective compression ratio being applied by the source device. A support member is positioned to be moved laterally in response to movement of the activating member and to support the locking member against the engagement zone of the datum member.