From: John Joyce <dangerwillrobinsondanger@...>
Date: 2007-07-05T00:15:09+09:00
Subject: Re: RubyOSA for QuickTime

There is also an AppleScript gem.
So you could use that to control any GUI app on OS X that has  
AppleScript events enabled. Most apps from Apple do have it enabled,  
and most apps for OS X have it, since it is one of the many things  
that the OS and the Cocoa framework provide to app programmers with  
very little effort at all.