I’m often asked how to present a movie to a secondary monitor on a mac using Quicktime. Say you have a Macbook with a larger monitor plugged into it (say 20″) and you’d like to present the movie full-screen in quicktime on that larger monitor.
You can do this from the “view” menu in quicktime, choose “present movie” then select the monitor you’d like to present on, and set any other options. Handy!