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Also known as: discussion thread
A chain of articles linked by replies, assembled by the newsreader from References headers rather than stored as a structure on the server. Each follow-up lists the Message-IDs of its ancestors, so a client can draw the tree even when articles arrive out of order or some never arrive at all. Subject lines usually carry a Re: prefix, but References is what actually determines placement.
Browse all terms in Core Usenet Concepts, or see the full Usenet glossary.