How to use this course Feature Description Example Interactive exercises Install Flash.  To use this multimedia course you must have the free Flash plugin installed on your computer. To the right is an example of part of a Flash element. If a dotted line appears around the element, as shown, click once or hit the space bar to activate, then follow the instructions for each exercise.   Navigation Click the arrows at the bottom right of the screen to proceed between pages.  Click the chapter titles at the top of the screen to navigate between chapters. Click "Save & Quit" on the bottom left to bookmark your progress and return to the that page later. Click to save and quit Click to go back Click to proceed Click the chapter title buttons to navigate between chapters Expanding text Click the blue squares to view more information about the topics listed Click the filled box icon to reveal more text. Click the empty box icon to close it.