Navigation API 
The LSAPI Navigation API exposes the navigation hierarchy and provides functionality to control navigation in the portal. You can use the Navigation API to manipulate the navigation iViews and/or regular portal navigation.
The Navigation API is comprised of the following:
NavigationNode Object: represents a node in the navigation tree
AFPModel Object: provides read-only access to the navigation tree of the current user
AFPController Object: controls access to navigation events
AFPService Object: enables actions, such as navigation to a specific node
setInitialNodes Method: defines the display sequence of nodes in top-level navigation
Tutorial: Using the Navigation API
Guides you through an implementation of a basic quick launch utility