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Also known as: client-side header index
A header index stored on the user's own machine rather than on an indexer. Desktop newsreaders still work this way: they download headers for a group, cache them in a database file, and search offline. The approach needs no third-party site and no API key, but consumes gigabytes of disk for large binary groups and goes stale unless headers are refreshed regularly.
Browse all terms in NZB Files & Indexing, or see the full Usenet glossary.