To use frames, you need both a frame layout file (which is an html document using the frameset command to define the frames you want to establish in your user's browser window), and other html documents (such as this one and the Table of Contents on the left) to display in the frames defined by the frame layout file. You can find frames explained in many places on the web and also under the Help menu of many html editors such as Claris Home Page. These editors often have Frames Wizards or Assistants to make the creation of frames relatively easy.
One very handy use of frames is the creation of a constantly visible Table of Contents. To do that, as in this case, the link tags in the table not only must indicate the URL of the file that one wants displayed but also include the target modifier that instructs the web browser to display the linked file in a particular named frame. To see how that is done, view the source of the Table of Contents frame on the left side of this window.
To see an example of a frame layout document, click to the opening page of Working With Networked Resources and use your browser's menu to View the Source.