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 for GNU Emacs
From The Free On-line Dictionary of Computing (30 December 2018) :

  GNU Emacs
      /ee'maks/ (Editing MACroS, or Extensible MACro
     System, GNU Emacs) A popular screen editor for Unix and
     most other operating systems.
     Emacs is distributed by the Free Software Foundation and was
     Richard Stallman's first step in the GNU project.  Emacs
     is extensible - it is easy to add new functions; customisable
     - you can rebind keys, and modify the behaviour of existing
     functions; self-documenting - there is extensive on-line,
     context-sensitive help; and has a real-time "what you see is
     what you get" display.  Emacs is writen in C and the higher
     levels are programmed in Emacs Lisp.
     Emacs has an entire Lisp system inside it.  It was
     originally written in TECO under ITS at the MIT AI
     lab.  AI Memo 554 described it as "an advanced,
     self-documenting, customisable, extensible real-time display
     It includes facilities to view directories, run compilation
     subprocesses and send and receive electronic mail and
     Usenet+news+({GNUS">Usenet news ({GNUS).  W3 is a web browser, the
     ange-ftp package provides transparent access to files on
     remote FTP servers.  Calc is a calculator and symbolic
     mathematics package.  There are "modes" provided to assist in
     editing most well-known programming languages.  Most of these
     extra functions are configured to load automatically on first
     use, reducing start-up time and memory consumption.  Many
     hackers (including Denis Howe) spend more than 80% of their
     tube time inside Emacs.
     Unix,+VMS,+GNU/{Linux">GNU Emacs is available for Unix, VMS, GNU/{Linux,
     FreeBSD, NetBSD, OpenBSD, MS Windows, MS-DOS, and
     other systems.  Emacs has been re-implemented more than 30
     times.  Other variants include GOSMACS, CCA Emacs, UniPress
     Emacs, Montgomery Emacs, and XEmacs.  Jove, epsilon, and
     MicroEmacs are limited look-alikes.
     Some Emacs versions running under window managers iconify as
     an overflowing kitchen sink, perhaps to suggest the one
     feature the editor does not (yet) include.  Indeed, some
     hackers find Emacs too heavyweight and baroque for their
     taste, and expand the name as "Escape Meta Alt Control Shift"
     to spoof its heavy reliance on keystrokes decorated with
     bucky bits.  Other spoof expansions include "Eight Megabytes
     And Constantly Swapping", "Eventually "malloc()'s All Computer
     Storage", and "Emacs Makes A Computer Slow" (see recursive
     acronym).  See also vi.
     Version 21.1 added a redisplay engine with support for
     proportional text, images, toolbars, tool tips, toolkit
     scroll bars and a mouse-sensitive mode line.
     FTP from your nearest GNU archive site.
     E-mail: (bug reports only) .
     Usenet newsgroups: news:gnu.emacs.help,
     news:gnu.emacs.bug, news:alt.religion.emacs,
     news:gnu.emacs.sources, news:gnu.emacs.announce.
     [{Jargon File]

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