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
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.
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.
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