The Chimera User's Guide contains three main sections:
Chimera documentation, including the User's Guide, is bundled with each release. Your local copy of the documentation can be accessed and searched via the Chimera Help menu. Use of the bundled documentation is recommended because it is synchronized with the locally installed version of Chimera. Current development and latest production release versions of the User's Guide are available as links from the Chimera home page's documentation index.
This locally installed Chimera documentation can be searched using "Search Documentation" in the Chimera Help menu.