The Yelp Help Browser application enables you to view documentation regarding GNOME and other components through a variety of formats. These formats include docbook files, HTML help pages, man pages, and info pages (support for man pages and info pages might optionally be compiled in). Yelp tries to provide a unified look and feel regardless of the original document format.
The Yelp Help Browser is internationalized, meaning that it has support to view documents in different languages. The documents must be localized or translated for each language and installed for Yelp Help Browser to be able to view them.
You can start Yelp Help Browser in one of the following ways:
Choose System → Help.
At the command line, type yelp.