The most expensive printers use Postscript - a language interpreted by the printer. This is used by printing firms to ensure that the results are identical from laser printers and specialist typesetting machines. Most museums will obtain good results from ordinary laser printers. If you are considering sharing a printer between several users, then you may want to look at a printer that can handle both headed and plain paper in separate trays, and which is capable of coping with larger print jobs. A modem allows you to link to other computers using telephone wires.
Extra care needs to be taken over security.
Each computer on the network has a network interface card installed and the cards are physically connected by cable. Larger networks need a special network operating system to control the network. The network operating system runs on a dedicated computer, called a fileserver, with a large hard disk holding shared programs and data. Computers linked to the fileserver are called workstations. Common network operating systems are Novell NetWare, Microsoft Windows NT and Unix.