Variable: local-function-key-map

Keymap that translates key sequences to key sequences during input.
This is used mainly for mapping key sequences into some preferred
key events (symbols).

The `read-key-sequence' function replaces any subsequence bound by
`local-function-key-map' with its binding. More precisely, when the
active keymaps have no binding for the current key sequence but
`local-function-key-map' binds a suffix of the sequence to a vector or
string, `read-key-sequence' replaces the matching suffix with its
binding, and continues with the new sequence.

If the binding is a function, it is called with one argument (the prompt)
and its return value (a key sequence) is used.

The events that come from bindings in `local-function-key-map' are not
themselves looked up in `local-function-key-map'.

For example, suppose `local-function-key-map' binds `ESC O P' to [f1].
Typing `ESC O P' to `read-key-sequence' would return [f1]. Typing
`C-x ESC O P' would return [?\C-x f1]. If [f1] were a prefix key,
typing `ESC O P x' would return [f1 x].

`local-function-key-map' has a separate binding for each terminal
device. See Info node `(elisp)Multiple Terminals'. If you need to
define a binding on all terminals, change `function-key-map'
instead. Initially, `local-function-key-map' is an empty keymap that has `function-key-map' as its parent on all terminal devices.