A compressed tar file containing HTML versions of this documentation is also available.
The documentation for version 4.1 can still be viewed online.
While the HTML information does not require you to use to have enabled cascading style sheets and JavaScript in your browser, it'll look and act better if they're enabled.
The HTML files for the Users Guide, CLI Guide, and Installation Guide have "buttons" running across the top that allow you to switch from book to book. Here's how you can find information within these books:
The very first file in each book is a table of contents.
The very last file in each book is an index.
The left side of each page has links to the first page of each chapter.