This website works similar to a book:

• The main page "index.html" is an index of all the pages available on the site.
• To step through the entire site in the order presented in the index, simply click on the "Next Subtopic" button located at the top and bottom of every page. This is the equivalent of turning each page in a book.
• To visit just the main topics and skip over the more detailed topics, simply click on the "Next Topic" button located at the top and bottom of every page.
• To link back to the index page, click on the Corona-Phone logo in the top left corner of every page (or the link mark "Home"). Just below this logo is the name of the current page ("p1.html" for this page, for example).
• The page structure is such that each major topic falls on a page number which is a multiple of 10, i.e. p20.html, p30.html, etc.. Sub topics are catagorized according to which major topic they fall under, and take incremental page numbers, i.e. p21.html, p22.html, p23.html, etc..
• Some topics do not have subtopics, hence p47.html may not exist, for example.