After you select a topic, the information for that topic is displayed in a window. Highlighted words or phrases indicate that additional information is available. You will notice that certain words and phrases are highlighted in blue letters, or in white letters on a black background. These are called hypertext terms. If you are using a mouse, double-click on the highlighted word. If you are using a keyboard, press the Tab key to move to the highlighted word, and then press Enter. Additional information is then displayed in a window.