[youtube http://www.youtube.com/watch?v=9uc8t4k07fM?wmode=transparent&autohide=1&egm=0&hd=1&iv_load_policy=3&modestbranding=1&rel=0&showinfo=0&showsearch=0&w=500&h=281]
Not a bad overview of a spotlight from the National Theater in the UK. What they call shutters are often called the chopper.
(Source: http://www.youtube.com/)