recursive threading

[Anon]

I'm looking for a little tutorial (or help) on recursive threading for a forum. I've seen on on dotcomma.org but it needs a database query for each recursive call (not very efficient). I've looked at the sourceforge code and seen that it's been done with one query and seen references to PHP algorithms (by Colin Vebroek I think) but I haven't been able to find any simple examples or tutorials.

Any help would be greatly appreciated.

Thanks

Frans King