[AVT] Syncronization of co-located clients?

[Greg Herlein <gherlein at herlein.com>]

I've got a scenario where I need to multicast RTP streams to 
multiple clients, and some of those may be within visual (and 
worse, audible) range of another client.

Is there a profile or other trick to help ensure syncronization 
*between* the clients?  In other words, ensure that the 
presentation of the material from one client is in sync with the 
others nearby?

I have some approaches to this, and have been hunting for other 
ideas.

Any links, references, research papers - whatever - would be 
appreciated.

Greg

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