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Naming intermediate prefix menus

Sometimes you have a deeper menu structure, but the name of a group of keys appears as a generic “Prefix Command”. But you would like to name the intermediate ‘command groups’. This can be done via `define-prefix-command`.

For example:

(define-prefix-command 'message-menu)
(bind-key (kbd "<f2> t") 'message-menu)
(bind-key (kbd "<f2> t 1") (defun my/message1 () (interactive) (message "Messag1")))
(bind-key (kbd "<f2> t 2") (defun my/message2 () (interactive) (message "Messag2")))

Now when you press f2, you will see [t] message-menu

Source: http://www.emacswiki.org/emacs/PrefixKey