With regards to my previous post, I have found something new.
BNR2 has an option to download posts as entire articles, with headers, or only the body, without headers.
So, as example, the following commands are used:
article <part58of61.$DuTuzB&Tn25qxJvpwu$@powerpost2000AA.local>
or
body <part58of61.$DuTuzB&Tn25qxJvpwu$@powerpost2000AA.local>
On the server I'm using I've found that the "body" command gives me a "dont have it" error, while the "article" command downloads the post. I assume what happens is that the headers are on the server but not the bodies. Only posts that have been cached on the news server have the headers and bodies, which can then be downloaded using "body".
I'm not sure which method alt.binz uses as I can't find an option for it.