Posted by Lilwolf on February 14, 2002 at 16:47:23:
(or any other modern free BBS software)
replies to replies.
ie,
post1
-reply1
-reply2
--reply1toreply2
--reply2toreply2
-reply3
post2
ect.
I know the boards over at retrogames can do it. I don't like their board much, but I do like the reply to replies better then the ones I've seen here.