computer programs recorded on magnetic and/or optical media for use with bar code and related symbology; batteries; interconnect cables, signal interface modules and units; battery chargers and dischargers; power supplies; laser scanners; contact scanners; non-contact scanners; hand-held bar code and related symbology scanners, hand-held data collection computer terminals, portable programmable bar code readers; concentrators and protocol converters for providing bidirectional data communications between a plurality of bar code readers and printers and a host computer; keyboards; radio-enabled hand-held computers and computer software therefor for use in field service technician dispatch, messaging, inventory control and invoicing; computer software for machining and assembly machines; computer software for automatic data collection and storage; automatic data collection and storage systems, comprising bar code readers, terminals, printers, scanners and computers; computer software for inventory/asset management, product location, warehousing and/or merchandise route accounting, and related communications; computer software for interconnecting mobile and/or stationary computers into wired and/or wireless networks; network manager computer software; operating software for manufacturing execution; electronic communications networking components, namely, controllers, gateways, access points, bridges and routers; electronic controllers for machining and assembly machines; data printing, communicating and reading electronic devices, namely, printers, electronic label and tag printers, bar code readers, hand-held light pens, hand-held scanners with keypad and display; RF ID interrogators; wireless scanners; terminals and interrogators; and signal multiplexers for coupling a plurality of bar code readers to a computer, modems, PCMCIA cards, radios, RF frequency networking controllers, wide area network modules; and local area network modules.