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A keymap is suitable for menu use if it has an overall prompt string, which is a string that appears as an element of the keymap. (See section 22.2 Format of Keymaps.) The string should describe the purpose of the menu's commands. Emacs displays the overall prompt string as the menu title in some cases, depending on the toolkit (if any) used for displaying menus.(6) Keyboard menus also display the overall prompt string.
The easiest way to construct a keymap with a prompt string is to specify
the string as an argument when you call
(see section 22.3 Creating Keymaps).
The order of items in the menu is the same as the order of bindings in
the keymap. Since
define-key puts new bindings at the front, you
should define the menu items starting at the bottom of the menu and
moving to the top, if you care about the order. When you add an item to
an existing menu, you can specify its position in the menu using
define-key-after (see section 22.12.7 Modifying Menus).
188.8.131.52 Simple Menu Items A simple kind of menu key binding, limited in capabilities. 184.108.40.206 Extended Menu Items More powerful menu item definitions let you specify keywords to enable various features. 220.127.116.11 Menu Separators Drawing a horizontal line through a menu. 18.104.22.168 Alias Menu Items Using command aliases in menu items.
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