clearok
clearok(win, TRUE);
clearok(stdscr, TRUE);
clearok(stdscr, 1);
clearok(stdscr, 1);
clearok(stdscr, 1);
(void)clearok(stdscr, TRUE);
(void)clearok(stdscr, TRUE);
clearok(stdscr, FALSE);
(void)clearok(stdscr, TRUE);
clearok(stdscr, TRUE);
clearok(curscr, TRUE);
clearok(stdscr, TRUE); /* force clear screen */
clearok(stdscr, TRUE);
clearok(WINDOW *win, bool flag)
clearok(CurScreen(SP_PARM), TRUE);
clearok(CurScreen(SP_PARM), TRUE); /* screen contents are unknown */
extern NCURSES_EXPORT(int) clearok (WINDOW *,bool); /* implemented */
clearok(my_win.x_win, TRUE);
clearok(his_win.x_win, TRUE);
clearok(curscr, 1);