High Quality Content by WIKIPEDIA articles! Print Services for UNIX is the name currently given by Microsoft to its support of the Line Printer Daemon protocol (also called LPR, LPD) on Windows NT-based systems. It is installed using the Add/Remove Programs control panel applet. This component allows LPD queues to be supported using the native Windows printing system. It does not provide the lpr, lpq, lprm, or lpc commands.