Overview
The navigation consists of the main- and subnavigation.As you might have seen, the CONTENIDO backend navigation consists of two rows of hirarchical items:
The upper row is the mainnavigation whereas the lower is called subnavigation. Several subnavigation items can be related to a single mainnavigation item. The database schema shows that a mainnavigation item is not related to areas but subnavigation items are! Subnavigation items have URLs that look like:
frameset.php?contenido=hash&area=foo
When clicking a subnavigation item all four (better five) frames are reloaded. In each frame the script is called that is configured (via record in table frame_files) to be displayed in the given frame for the given area.