[M4IF Technotes] bifs related

[raju2003 bolt.com]

Hi 
   I am working on BIFS decoder and i need some
clarifications on that.I have gone through IM1 source
code.Still i am not getting how do they handle
MovieTexture(or other Time related nodes) Nodes in one
BIFS SceneReplace command with  different startTimes.
For example,If there are 3 MovieTextureNodes with
different StartTime and endTime values,how the IM1(or
in general)handles the initiattion of the respective
decoders.?
Does it keeps polling(not good)for the time to reach 
startTime  so as to  start the processing of respective
media ? OR
MovieTextureNodes with different StartTime values come 
as part of InsertionCommand and not in the Initial
SceneReplace command .If so what is the point in having
startTime, as it would be 0, by default ?
thx in advance
raj
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