How to determ which part belongs to another header?

Giganews Newsgroups
Subject: How to determ which part belongs to another header?
Posted by:  Perry Kappetein (someo…@hotmail.com)
Date: Thu, 7 Apr 2005

I am working on a news program, but after getting all the headers
how do you determ which part belongs to the other
i.e.  a picture is in 3 parts  [1/3]  [2/3]  and [3/3]
I've looked at all the information that I can get, but can't figure out how
to determ that they
belong to each other..  not finding any reference too eachother..
Someone told me, to look at the subject.. but that sounds very weird to me.
Anyone knows how to do this? or point me in the right direction?
Thanks so much

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