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Also known as: header scanning
The routine work an indexer does: connecting to a news server, pulling new headers for each group it tracks with OVER or XOVER, parsing the subjects and writing entries to its database. Scanning runs continuously, often every few minutes per group, and its speed determines how soon after posting an item becomes searchable. Backfill is the same operation aimed at older articles.
Browse all terms in NZB Files & Indexing, or see the full Usenet glossary.