"..... longish thread with a half-dozen or more messages from GUEST, I would prefer to know whether more than one person has been participating under that ID; if so, I would prefer to be able to distinguish between the arguments of one guest and another. That's all. That's it."

Not an unreasonable request Poppagator. It would be an immense aid to intelligent conversation but if that is not what is required then as Ed and Joe said earlier - TOUGH