Reading Input
The editor command loop reads key sequences using the function read-key-sequence, which uses read-event. These and other functions for event input are also available for use in Lisp programs. See also momentary-string-display in Temporary Displays, and sit-for in Waiting for Elapsed Time or Input. See Terminal Input, for functions and variables for controlling terminal input modes and debugging terminal input.
For higher-level input facilities, see Minibuffers.
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https://www.gnu.org/software/emacs/manual/html_node/elisp/Reading-Input.html