computer hardware, computer peripherals, computer software, and user manuals and instructional books, sold as a unit, for use in desktop publishing, page layout, color separation, printing, software application, and print job execution, sequencing and management; computer printing networks comprised of computer printers, hardware interfaces therefor, and computer software for managing the networks; computer output devices for image, text, and graphics; data processors; and reproduction equipment for use in desktop publishing, page layout, color separation, and printing; printers and parts therefor