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WORDS:  If there are any words or symbols you don't understand, just place the mouse pointer over the word or symbol and the definition will appear. (Note:  The definition only appears for a few seconds; move the mouse pointer over the word again and the definition will reappear.)  If you can't find a definition for the word you want, use a good dictionary.

BUTTONS: There are several buttons found throughout the web site:

Review Article:  Located at the top of the screen, this button will take you to the first page of the Exchange article.

Help:  Located at the top of the screen, this button displays this Help page.

Navigation:  Along the left-hand side are buttons that will take you to other areas of the site, or to other web sites, as indicated by the labels on the buttons.

Examples:  Throughout the Exchange article, you will see buttons labeled "Examples," like this: Clicking on an "Examples" button will take you to a page with several examples of the concept covered in the section of text just before the button.  We encourage you to use these "Examples" buttons frequently to clarify the concepts and help make them real.

BACKING UP:  To go back and review pages already viewed, use the "Back" button, which is usually at the top left-hand corner of your browser. After reviewing an earlier page, use the "Forward" button to move forward through pages already viewed to where you left off.

To continue, click the "Back" button now.