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 item 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. (The variable menu-prompt-more-char specifies
which character is used for this; SPC is the default.)
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.
This way of using menus in an Emacs-like editor was inspired by the Hierarkey system.
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