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 computer application software for mobile computers for use in point-of-sale (POS) systems and order entry systems; computer programs for computer printers for use in point-of-sale (POS) systems and order entry systems; telecommunication machines and apparatus for use in point-of-sale (POS) systems and order entry systems, namely, computer network adapters, hubs and routers; recorded computer operating programs; computer peripherals; computer hardware for telecommunications.