Messages grouped by thread means one could click on "previous message in thread" and "next message in thread" and under each message, it would have a liunk to the replies to that specific message. This is how it works at IYT. ALso, at DSG, there is a alightly different system that is also effective. Each new thread is listed on a list of topics, and replies to that thread are found by clicking on the main thread.

Iti s hard to explain exactly. CHeck out www.pente.org to see what I mean. BOth ways are useful.