n arrow flowing
to a process indication labeled Track Buffer.<p>

<p>This Track Buffer then flows to a red box labeled Video Decoder, which
then flows to the same switch that feeds to the Video Tag Display Region
previously mentioned in SourceBuffer 1. The switch is positioned so that
this Video Decoder ouptut is connected to the Video Tag Display Region.</p>

<h3 id='sourcebuffer3'>Flowing down from SourceBuffer 3</h3>

<p>Flowing down from SourceBuffer 3 is a rose triangle with an arrow flowing to
a proce