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Minibuffers

A minibuffer is a special buffer that Emacs commands use to read arguments more complicated than the single numeric prefix argument. These arguments include file names, buffer names, and command names (as in M-x). The minibuffer is displayed on the bottom line of the frame, in the same place as the echo area (see The Echo Area), but only while it is in use for reading an argument.

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Licensed under the GNU GPL license.
https://www.gnu.org/software/emacs/manual/html_node/elisp/Minibuffers.html