Downloadable computer programs for enabling mobile computer terminals both to be wired-connected to computer networks and to be charged via computer printers; downloadable computer programs for enabling mobile computer terminals both to be wired-connected to computer networks and to be charged via USB cables; computer printers for use in point-of-sale (POS) systems and order entry systems, namely, document printers for use in point-of-sale (POS) systems and order entry systems; downloadable c...