1. Printer filter for HP LaserJet printers ifhp is a highly versatile print filter for BSD based print spoolers. It can be configured to handle text, PostScript, PJL, PCL, and raster printers, supports conversion from one format to another, and can be used as a stand-alone print utility. It is the primary supported print filter for the LPRng print spooler. It provides access to printer features like duplex printing, paper tray selection and strong accounting using the printer's internal page counter. From Debian 3.0r0 APT