This murex module provides the help and edit hotkeys:
Press {F1} when you have a command line written and to trigger a help pane
with the man page on the command (or source code for functions) as well as a
cheat sheet on it's usage (if one exists).
Press {CTRL+E} when you have a partial command line written to bring up a
full screen editor (defined either via export EDITOR or config set shell editor).
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If a filename exists in the path, then the editor would be for that file.
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If no file name exists, but the calling command is a murex function, then the editor would be for that function.
If you enter vi mode (hit {ESC} on the command prompt) then press v to
start the "visual editor" (aka which ever editor is defined in $EDITOR.
The config set shell editor method will also change that value here too.