(xemacs.info)Emulation

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26.14 Emulation
===============

XEmacs can be programmed to emulate (more or less) most other editors.
Standard facilities can emulate these:

Viper (a vi emulator)
     In XEmacs, Viper is the preferred emulation of vi within XEmacs.
     Viper is designed to allow you to take advantage of the best
     features of XEmacs while still doing your basic editing in a
     familiar, vi-like fashion.  Viper provides various different
     levels of vi emulation, from a quite complete emulation that
     allows almost no access to native XEmacs commands, to an "expert"
     mode that combines the most useful vi commands with the most
     useful XEmacs commands.

     To start Viper, put the command

          (viper-mode)

     in your init file.  Note: Init File.

     Viper comes with a separate manual that is provided standard with
     the XEmacs distribution.

EDT (DEC VMS editor)
     Turn on EDT emulation with `M-x edt-emulation-on'.  `M-x
     edt-emulation-off' restores normal Emacs command bindings.

     Most of the EDT emulation commands are keypad keys, and most
     standard Emacs key bindings are still available.  The EDT
     emulation rebindings are done in the global keymap, so there is no
     problem switching buffers or major modes while in EDT emulation.

Gosling Emacs
     Turn on emulation of Gosling Emacs (aka Unipress Emacs) with `M-x
     set-gosmacs-bindings'.  This redefines many keys, mostly on the
     `C-x' and `ESC' prefixes, to work as they do in Gosmacs.  `M-x
     set-gnu-bindings' returns to normal XEmacs by rebinding the same
     keys to the definitions they had at the time `M-x
     set-gosmacs-bindings' was done.

     It is also possible to run Mocklisp code written for Gosling Emacs.
     Note: Mocklisp.