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GNU troff
’s output is in a device-independent page description
language. An output driver translates this language into a file
format or byte stream that a piece of (possibly emulated) hardware
understands. groff
features output drivers for PostScript
devices, terminal emulators (and other simple typewriter-like machines),
X11 (for previewing), TeX DVI, HP LaserJet 4/PCL5 printers,
Canon LBP (CaPSL-using printers), HTML,
XHTML, and PDF.