how to show rss feed of posts like vb.com

[Alexey?]

How can i do for my site that it will show me Posts RSS FEED like this
http://www.vbulletin.com/forum/external.php?lastpost=true

[Lynne]

That is an rss feed of threads, not posts. Turn on your rss feed at vboptions > external data provider > enable rss syndication

[Alexey?]

oo.
i thought it was posts.
Any way can i do some how a rss of posts?

[Lynne]

Not without writing your own rss feed to do so.

[Alexey?]

So how can i write my own rss?

[Lynne]

Well, I've never done that, but I suppose if I were to do it, I would start with the existing external.php page and modify it to do what I wanted.

[Dismounted]

external.php contains code not only for RSS (and RSS2), but Atom and JS syndication methods, so there would be a lot to work through. However, there may be hooks available for you to use to change up the query.