The bottom of each page has navigational links for the previous page, next page, top page, and chapter index (where applicable).
Furthermore, you can:
• click the right edge for the next page.
• click the left edge for the previous page.
• click the top edge for the first page of the current chapter.
• click the upper-left corner for the table of contents.
Roll over the page edges to see these clickable areas.
Cross-references, denoted with small caps, are clickable.
Links to outside material are denoted with a red circle, like so.