Document printers connected to a wired or wireless network; document printers for use with computers; photocopying machines; facsimile machines; laser document printers; scanners; multifunction document printers having functions of photocopier, facsimile and scanner; label printers for use with computers; bar code printers; thermal printers; radio-frequency identification RFID readers; radio-frequency identification RFID tags; labels with integrated RFID chips; print heads for ink-jet printers; cash registers; point-of-sale [POS] terminals; digital signs; computer peripheral devices; toner cartridges, unfilled, for photocopiers; toner cartridges, unfilled, for printers; downloadable computer programs and software for operating document printers connected to a wired or wireless network, document printers for use with computers, photocopying machines, facsimile machines, laser document printers, scanners, multifunction document printers having functions of photocopier, facsimile and scanner, label printers for use with computers, bar code printers, thermal printers, radio-frequency identification RFID readers, radio-frequency identification RFID tags, labels with integrated RFID chips, print heads for ink-jet printers, cash registers, point-of-sale POS terminals, digital signs, computer peripheral devices; downloadable computer programs and software for viewing, editing and merging function used in multifunction machines with photocopying, scanning, printing and facsimile functions; downloadable computer programs and software for monitoring computer systems by remote access for managing photocopiers, electronic copying machines or multifunction printers with photocopying, facsimile and scanning functions with cloud computing; downloadable computer programs and software for portable information terminals for monitoring computer systems by remote access for managing photocopiers, electronic copying machines or multifunction printers with photocopying, facsimile and scanning functions with cloud computing; downloadable computer programs and software for personal digital assistants for monitoring computer systems by remote access for managing photocopiers, electronic copying machines or multifunction printers with photocopying, facsimile and scanning functions with cloud computing; downloadable computer programs and software for use in promoting the goods and services of others by distributing paperless electronic coupons and providing paperless electronic coupon transactions; downloadable computer programs and software for operating POS systems; recorded computer programs and software for operating document printers connected to a wired or wireless network, document printers for use with computers, photocopying machines, facsimile machines, laser document printers, scanners, multifunction document printers having functions of photocopier, facsimile and scanner, label printers for use with computers, bar code printers, thermal printers, radio-frequency identification RFID readers, radio-frequency identification RFID tags, labels with integrated RFID chips, print heads for ink-jet printers, cash registers, point-of-sale POS terminals, digital signs, computer peripheral devices; recorded computer programs and software for viewing, editing and merging function used in multifunction machines with photocopying, scanning, printing and facsimile functions; recorded computer programs and software for monitoring computer systems by remote access for managing photocopiers, electronic copying machines or multifunction printers with photocopying, facsimile and scanning functions with cloud computing; recorded computer programs and software for portable information terminals for monitoring computer systems by remote access for managing photocopiers, electronic copying machines or multifunction printers with photocopying, facsimile and scanning functions with cloud computing; recorded computer programs and software for personal digital assistants for monitoring computer systems by remote access for managing photocopiers, electronic copying machines or multifunction printers with photocopying, facsimile and scanning functions with cloud computing; recorded computer programs and software for use in promoting the goods and services of others by distributing paperless electronic coupons and providing paperless electronic coupon transactions; recorded computer programs and software for operating POS systems