clearok(3cur)clearok(3cur)Nameclearok - enable screen clearing
int clearok(win, bf)
If is the next call to for the specified window will clear the window
completely and redraw the entire window without changing the original
screen's contents. This is useful when the contents of the screen are
uncertain. If the window is the entire screen is redrawn.
The function returns OK on success and ERR on error.