The BiLPDManager is a LPD/LPR Print Server which receives print files from UNIX, Linux, MAC, AS400 and Solaris host systems via TCP/IP LPR/LPD port and print them to networked, local, or shared printers. The BiLPDManager can work as a windows service or a desktop application. The BiLPDManager listens for requests on default TCP port 515 named LPR/LPD (Line Printer Remote/Line Printer Daemon) which is a TCP/IP printing protocol for network print services.

Originally developed for Berkeley Unix (BSD Unix), LPR/LPD was the de facto standard for Unix printing prior to LPRng, IPP and CUPS. Used in conjunction with a printer driver, the LPR/LPD server queues the files and prints them when the printer becomes available. BiLPDManager can support multiple printers, in which case, the client identifies the intended printer by its queue name. In order to provide a complete printing system, LPR/LPD is used with a printer driver that converts the data into the command format required by the printer. Many different queue names may exist in BiLPDManager, with each queue having unique settings. BiLPDManager have the option to automatically create a new queue when a print job with an unknown queue name is received.