In this file, many of the anchors are names. So, clicking in the frame at the left has the effect of scrolling up to show a line in the field at the right. If the links in this frame were just written as ordinary links, then the linked HTML files will appear in this frame. Usually that's not what is desired. It is desired that one go from this page to some other place at the site.
Frames require considerable practice, but they seem to be worth the effort required.
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