> I remember an episode of _Murder She Wrote_ where that was explained. > Whistling was the way they signalled when to raise & lower curtains. > Heavy sandbags were involved and accidents could happen if someone > carelessly whistled and that was interpreted as a signal. Ah, yes. Quite right. Thanks for the reminder. Though, they no longer do that now, so why it's remained is beyond me. I didn't whistle backstage though. At least, not so's anyone could hear me.... Chris