__CLEAROK
win->flags |= __CLEAROK;
win->flags |= __CLEAROK;
win->flags &= ~__CLEAROK;
if (dwin->flags & __CLEAROK) {
screen->__virtscr->flags |= __CLEAROK;
dwin->flags &= ~__CLEAROK;
if ((win->flags & __CLEAROK) || (curscr->flags & __CLEAROK) ||
curscr->flags &= ~__CLEAROK;
win->flags &= ~__CLEAROK;