# A space or tab is needed between IP address and hostname.
Printer Name is used to specify a printer when you register or send print jobs to it. In some UNIX systems, Queue Name is used instead.
Printer Server means an IP address or hostname of the PC running Xlpd. Depending on systems, it may only require the hostname.
Queue Name defines the queue name of Xlpd (Printer Server). Xlpd receives the print job from the client machines. Each print job has its assigned queue name. When Xlpd receives the print job, it then finds a queue that has a matching queue name and processes it accordingly. If the queue name does not exist, Xlpd can create a new queue that has the name specified in the print job or use the default queue instead.
$ man printcap
$ lpr -PPrinter_name
$ lpr -dPrinter_name filename