When you are finished reading the section, you can access the TOC by using the link at the top of the text page, or you can use this extra window like a frame. To do so, use the 'Window' menu to toggle back and forth between your text window and your main page or TOC window. To reduce the number of links to tab through in the main page, you can open the TOC by using the link at the top of the main page. To reduce the number of windows, you may want to close the text window when you continue on to the next section.