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+.TH DITROFF 7 "7 February 2022" "groff 1.22.4"
+.SH NAME
+ditroff \- classical device-independent roff
+.
+.
+.\" ====================================================================
+.\" Legal Terms
+.\" ====================================================================
+.\"
+.\" Copyright (C) 2001-2018 Free Software Foundation, Inc.
+.\"
+.\" This file is part of groff, the GNU roff type-setting system.
+.\"
+.\" Permission is granted to copy, distribute and/or modify this
+.\" document under the terms of the GNU Free Documentation License,
+.\" Version 1.3 or any later version published by the Free Software
+.\" Foundation; with no Invariant Sections, with no Front-Cover Texts,
+.\" and with no Back-Cover Texts.
+.\"
+.\" A copy of the Free Documentation License is included as a file
+.\" called FDL in the main directory of the groff source package.
+.
+.
+.\" ====================================================================
+.SH DESCRIPTION
+.\" ====================================================================
+.
+The name
+.I ditroff
+refers to a historical development stage of the
+.IR roff (7)
+text processing system.
+.
+In
+.I roff
+systems extant today, the name
+.I troff
+is a synonym for
+.IR ditroff .
+.
+.
+.P
+Early versions of
+.I roff
+by Joe Ossanna generated two programs from the same sources,
+using conditional compilation to distinguish them.
+.
+.I nroff
+produced text-oriented TTY output, while
+.I troff
+generated graphical output for exactly one output device, the
+Wang Graphic Systems CAT phototypesetter.
+.
+.
+.P
+In 1979, Brian Kernighan rewrote
+.I troff
+to support more devices by creating an intermediate output format for
+.I troff
+that could be fed into postprocessor programs which actually do the
+printout on the device.
+.
+Kernighan's version marks what is known as \(lqclassical troff\(rq
+today.
+.
+In order to distinguish it from Ossanna's original version, it was
+called
+.I ditroff
+.RI ( d "evice " i "ndependent " t roff)
+on some systems, though this naming isn't mentioned in the classical
+documentation.
+.
+.
+.P
+Today, all existing
+.I roff
+systems are based on Kernighan's multi-device
+.IR troff .
+.
+The distinction between
+.I troff
+and
+.I ditroff
+is no longer necessary; each modern
+.I troff
+provides the complete functionality of
+.IR ditroff .
+.
+.
+.P
+The easiest way to use
+.I ditroff
+is via the GNU
+.I roff
+system,
+.IR groff .
+.
+The
+.IR groff (1)
+program is a wrapper around
+.I (di)troff
+that automatically handles device postprocessing.
+.
+.
+.\" ====================================================================
+.SH AUTHORS
+.\" ====================================================================
+.
+This document was written by
+.MT groff\-bernd.warken\-72@\:web.de
+Bernd Warken
+.ME .
+.
+.
+.\" ====================================================================
+.SH "SEE ALSO"
+.\" ====================================================================
+.
+.TP
+CSTR\~#54
+refers to the 1992 revision of the
+.I Nroff/Troff User's Manual
+by J.\& F.\& Ossanna and Brian Kernighan.
+.
+.
+.TP
+CSTR\~#97
+refers to
+.IR "A Typesetter-independent TROFF" ,
+by Brian Kernighan and is the original documentation of the first
+multi-device
+.I troff
+.RI ( ditroff ).
+.
+.
+.TP
+.IR roff (7)
+provides a history and conceptual overview of
+.I roff
+systems.
+.
+.
+.TP
+.IR troff (1)
+describes the GNU implementation of
+.IR (di)troff .
+.
+.
+.TP
+.IR groff (1)
+documents the GNU
+.I roff
+program and includes pointers to further documentation about
+.IR groff .
+.
+.
+.TP
+.IR groff_out (5)
+describes the
+.I groff
+version of the intermediate output language, the basis for
+multi-device output.
+.
+.
+.\" ====================================================================
+.\" Editor settings
+.\" ====================================================================
+.
+.\" Local Variables:
+.\" mode: nroff
+.\" fill-column: 72
+.\" End:
+.\" vim: set filetype=groff textwidth=72: