Line Printer Daemon (LPD)
The Line Printer Daemon (LPD) protocol provides print services on both client and server systems. The most common use of LPD is as a print server and client on UNIX and Linux systems. As well as providing the basic print mechanisms, LPD supports a set of commands that enable the print queue to be controlled. It also provides commands for controlling print jobs once they have been placed in the print queue.