To start, click on a link on the Title Page, or one from the Table of Contents. This will load the next document. Items in the menubar can also be used to go directly to certain pages that may be useful to you, such as a glossary of terms, a search engine/index, and suggested example exercises.
To return to a previous document, use the "<--" back button on the course menubar. Don't use the Netscape back button, as this may not have the desired effect