http://www.apple.com/quicktime/tools_tips/tutorials/tracks.html
http://www.apple.com/quicktime/tools_tips/tutorials/hreftracks.html
and Examples : http://web.uvic.ca/akeller/pw408/d_qt_link_to_web_pages.html
http://www.apple.com/quicktime/tools_tips/tutorials/interactive.html
Creates alternate movies for various internet connection speeds, CPU's, languages, and more. This version runs on Mac OS X and allows you to create a reference movie that supports QuickTime 6.
http://developer.apple.com/quicktime/quicktimeintro/tools/
http://www.qtbridge.com/pageot/qtnext/Sequence_eng.html