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Also known as: article numbers
Each server assigns its own sequential number to an article within each group it appears in, starting from 1 and never reused. The numbers are local: article 500000 on one server is a different article on another, which is why Message-IDs, not numbers, identify articles globally. Gaps appear as articles expire, so a range from GROUP overstates what is actually held.
Browse all terms in Protocol & Server Infrastructure, or see the full Usenet glossary.