Linkbars define the virtual location of the page within the domain. Linkbars are located at the top and bottom of each page, and when a button is not outlined with a blue line then it is not linked. Home Page links to the domain's top page. One page up displays the page above the current one in the hierarchical document. Previous section displays the previous adjacent sibling in the hierarchical document.
Next section displays the next sibling in the document.
Domain outline button will call up a map outline of the domain. Search button will prompt a keyword search in the domain. Navigation help accesses this help document.