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#### 8.1.1 What is nnir?

`nnir` is a Gnus interface to a number of tools for searching through mail and news repositories. Different backends (like `nnimap` and `nntp`) work with different tools (called engines in `nnir` lingo), but all use the same basic search interface.

The `nnimap` and `gmane` search engines should work with no configuration. Other engines require a local index that needs to be created and maintained outside of Gnus.