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Originally posted by dbates
To do what your asking you would have to create an rss feed with every possible scenario possible.
Originally posted by MCory1
Keeping it with a static XML file though, whenever a forum has a new post in it, you could do a query to see which users are subscribed to it and then update their personal RSS feed as necessary. Main drawback there though is that you'd need a separate file for every member, which would probably take up a big chunk of real estate on the server, not to mention the extra processing time required to generate the files (it'd be fun to see that work out on a forum with a couple thousand subscribers...)