Email discussion:

> Section 4.3.2:  The paragraph beginning "For all other message types" 
> is very confusing to me and I still don't understand it.  The first 
> sentence sounds like it's relegating all further information on 
> message processing to another section, but then the paragraph 
> continues to talk about the rest of the message.  I can't see whether 
> these four sentences in the paragraph are four random facts put 
> together spatially or somehow relate together semantically as well.

OK; they do relate semantically, but the text is not ideal.
The intention here is to describe the interaction with the NSLP (i.e. the
delivery of the NSLP payload to it), without having to go into the full
description of the GIST internal processing. We can work on a clearer
formulation; I think the main problem is with the first sentence, in fact.