The next page icon and the previous page icon appear at the top and bottom of most of the pages on this site. These enable you to read this site like a book.
Most pages also have a menu on the left.
Right now the menu is showing you the top level course outline. Other pages contain sub-section menus instead. Often one of the items on a menu will be grayed out . This tells you where you are now. Speaking of which, that top bar provides one-click access to the home page, the registration area, the Past Pages feature and the memorized references feature.