You can set a section title and a subsection title for each page of an Ipe document. Theses titles will be shown in the bookmarks list (right-click on a toolbar to make it visible). Double-clicking a title brings you directly to its page, making navigation of long documents much easier. The titles are also exported to PDF, and are visible in the bookmarks view of PDF viewers.
You can also use the section title of a page to refer to this page in ipetoipe and iperender.