Passing information to a sub dissector

[Jérôme HAMM <jerome.hamm () planete-sciences org>]

Hi

What is the return value of the main dissector function (the one that gets registered with register_dissector) supposed 
to be? What is supposed to be in its void* data parameter? (I checked the doc but didn't find an answer)

Is there a standard way to pass data to a sub-dissector (for example, two sftp streams could be opened in the same ssh 
session, how do I tell the subdissector with which "conversation" it should work)?

Cheers
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