Most of the Index Keywords are associated with each URL in the Contents.
However you can have more Index keywords which are not associated URLs in your Contents. These appear in the Other Index Keywords entry at the bottom of the Hi Lab display. Highlight this and select View+Index keywords... to view these keywords.
When editing the Other Index Keywords, note that the Anchor and Extra title fields may not be empty. The Anchor should contain the URL to display.
|See also:||Index Keywords Property Page|