If the Internet lately has seemed more accessible to ordinary mortals, it is largely the result of two inventions: the first is the World Wide Web, an organizing system within the Internet that makes it easy to establish links between computers around the world; the second is a program called Mosaic, a "browser" that presents the information in the Web in the point-and-click format so familiar to Macintosh and Windows users.
What the computer user sees when he fires up Mosaic is a document that looks something like a magazine page. It has nicely formatted text. It has bulleted lists of...