The essential concept for any course in online documentation is hypertext . Collected here are a dozen or so links to discussions of hypertext. Menu list of links that take you to different parts of the hypertext. Frame Independently scrollable areas of a screen.
Hypertexts often use one frame for the text and the other frame for the menu.
While the text frame changes according to the reader's needs, the menu frame is always viewable. Navigation the set of tools avaiable to readers to enable them to move around in the hypertext, find what they want, and retrace their paths. In the following links, you'll see a lot references to the World Wide Web. The Web is simply a hypertext delivery system the hypertext it delivers is the grandest of them all. Click on The Internet and The World Wide Web and explore.