[Mp4-tech] handling hint tracks in a client

[Arnel.Periquet nokia.com]

Hi, 
I have a general question about how hint tracks are handled on client such an MP4 player.
I know the mp4 specs require hint tracks to be ignored for local playback 
since they are used to guide protocol-specific packetization.
What I don't know is if hint tracks are used to guide depacketization on a client.
In particular, are hint tracks typically ignored by clients in the streaming (network) case or 
are they actually used for depacketization? Does the server even send hint tracks to a 
client when it is streaming?
Thanks,
Arnel