In the past, the left side navigation buttons were the main aid to topic navigation,

               the selection available on a wide page is determined by a look-up system that links similar in-context topics

 

 

               Heritage pages also had an upper navigation bar that was used to move to external web sites                      e.g.  80 

 

Topic pages have two schemes ~/heritage/includes/moonav3 and ~/runtime/sidenavSV.php

 

 

 

               The lower menu offers a "means of jumping" to associated topic pages.

 

Topic pages that employ functions/unipageSb have the data for lower menus stored at Sutton