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define_key - define a keycode
int define_key(char *definition, int keycode);
This is an extension to the curses library. It permits an application to define keycodes
with their corresponding control strings, so that the ncurses library will interpret them
just as it would the predefined codes in the terminfo database.
If the given string is null, any existing definition for the keycode is removed. Simi-
larly, if the given keycode is negative or zero, any existing string for the given defini-
tion is removed.
The keycode must be greater than zero, else ERR is returned.
These routines are specific to ncurses. They were not supported on Version 7, BSD or Sys-
tem V implementations. It is recommended that any code depending on them be conditioned
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