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When a prefix key ending with a keyboard event (a character or function key) has a definition that is a menu keymap, the user can use the keyboard to choose a menu item.
Emacs displays the menu alternatives (the prompt strings of the bindings) in the echo area. If they don't all fit at once, the user can type SPC to see the next line of alternatives. Successive uses of SPC eventually get to the end of the menu and then cycle around to the beginning.
When the user has found the desired alternative from the menu, he or she should type the corresponding character--the one whose binding is that alternative.
In a menu intended for keyboard use, each menu item must clearly indicate what character to type. The best convention to use is to make the character the first letter of the menu item prompt string. That is something users will understand without being told.
This way of using menus in an Emacs-like editor was inspired by the Hierarkey system.
Variable: menu-prompt-more-char
This variable specifies the character to use to ask to see the next line of a menu. Its initial value is 32, the code for SPC.
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