Each line of the graphic is a clickable link corresponding to the same
heading in the text window. Clicking on the heading in the left bar will
scroll the text to that heading. In the index, bibliography, and glossary,
clicking on a letter will pull up that letter's entries. Light blue letters
have no entries. White underlined letters have entries. Left-hand Navigation Bar
Text Navigation
jumps to the next section/chapter of the book.
jumps to the previous section/chapter of the book.
moves to the next heading of the current document.
jumps to the top of the current document.