Runtime APIs 
The following interfaces and classes are described in the system:
IF_WD_ACTION
IF_WD_APPLICATION
IF_WD_COMPONENT
IF_WD_COMPONENT_USAGE
IF_WD_COMPONENT_USAGE_GROUP
IF_WD_CONTROLLER
IF_WD_MESSAGE_MANAGER
IF_WD_NAVIGATION_SERVICES
IF_WD_NAVIGATION_SERVICES_NEW
IF_WD_VALIDATION
IF_WD_VIEW
IF_WD_VIEW_CONTROLLER
IF_WD_VIEW_ELEMENT
IF_WD_WINDOW
IF_WD_WINDOW_CONTROLLER
IF_WD_WINDOW_MANAGER
IF_WD_PERSONALIZATION
Cl_WD_CUSTOM_EVENT