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keyok - enable or disable a keycode
int keyok(int keycode, bool enable);
This is an extension to the curses library. It permits an application to disable specific
keycodes, rather than use the keypad function to disable all keycodes. Keys that have
been disabled can be reenabled.
The keycode must be greater than zero, else ERR is returned. If it does not correspond to
a defined key, then ERR is returned. If the enable parameter is true, then the key must
have been disabled, and vice versa. Otherwise, the function returns OK.
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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