Apple Final Cut Express 4 - Manual (Page 885)

Chapter 56 Using RT Extreme 885
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About Render Status Bar Tooltips
If you position the pointer over a render bar, a tooltip appears with information about
the real-time or render status of that section of your sequence.
Effect Names That Appear in Boldface
In both the Effects tab of the Browser and the Effects menu, video transitions and filters
that can play back in real time appear in boldface.
A tooltip tells you the
status of a particular
section of your sequence.
Real-time effects appear
in boldface.