ck diagram of the print engine controller shown in FIGS. 14 and 15; FIG. 17 is a perspective view of a single Memjet??? printing element, as used in, for example, the netpage printer of FIGS. 10 to 12; FIG. 18 is a schematic view of the structure of an item ID; FIG. 19 is a schematic view of the structure of a Hyperlabel??? tag; FIG. 20 is a schematic view of a product item and object ownership an