Simultaneously Playing Multiple Movies
You can have more than one QuickTime Player window open at a time.
To open more than one QuickTime Player window, do one of the following:
Â Double-click another movie file.
Â Choose View > Play All Movies.
By default, when you have more than one QuickTime Player window open, the audio
plays only on the active (frontmost) QuickTime Player window. For information about
changing this setting, see “Changing Playback Preferences” on page 18.
Using QuickTime Player