. . "BRIEF DESCRIPTION OF THE DRAWINGS [0087]FIG. 1 is a schematic diagram of one exemplary embodiment of a data processing system according to the present invention. [0088]FIG. 2 depicts in more detail a computer system in accordance with the embodiment in FIG. 1. [0089]FIGS. 3A and 3B are a perspective view and a block diagram, respectively, of a portable unit according to an exemplary embodiment of" . . . .