.SH RETURN VALUE
The keycode must be greater than zero, else NULL is returned.
If it does not correspond to a defined key, then NULL is returned.
Otherwise, the function returns a string, which must be freed by the caller.
.SH RETURN VALUE
The keycode must be greater than zero, else NULL is returned.
If it does not correspond to a defined key, then NULL is returned.
Otherwise, the function returns a string, which must be freed by the caller.