The LPRng Print Spooler provides the essential printing services for UNIX and UNIX-like operating systems. It can be configured to work optimally in small, large, and enterprise level environments. The LPRng Print Spooler has a companion ifhp Print Filter which provides printer level support and communication. This document is designed to be the single basic reference for the LPRng software; the ifhp Print Filter is distributed separately and has additional documentation.