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The non-standard command that made header browsing practical: one request returns subject, author, date, Message-ID, references, byte count and line count for a whole range of articles. Newsreaders used it to build group listings without fetching a single article. RFC 3977 standardized the same function as OVER; servers keep XOVER as an alias, and older clients still send it.
Browse all terms in Protocol & Server Infrastructure, or see the full Usenet glossary.