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Also known as: overview, OVER database
A per-group index holding a few fields from each article: subject, author, date, Message-ID, References, byte count, and line count. Servers maintain it so clients can list a group without fetching whole articles, which is what makes opening a group of millions of posts practical at all. The XOVER and OVER commands read it, and bulk header downloading in binary readers is overview retrieval at scale.
Browse all terms in Core Usenet Concepts, or see the full Usenet glossary.