The following service classes and interfaces provide general services for the development of Web Dynpro applications:
CL_WD_CONTEXT_SERVICES
CL_WD_DYNAMIC_TOOL
CL_WD_COMPONENT_ASSISTANCE
CL_WD_RUNTIME_SERVICES
CL_WD_UTILITIES
CL_WD_TRACE_TOOL und IF_WD_TRACE_TOOL
IF_WD_SELECT_OPTIONS
CL_WD_WEB_ICON
CL_WEB_DYNPRO
IF_WD_ACFUPDOWNLOAD_SWFS
CL_WD_NOTIFICATION_SERVICE and IF_WD_NOTIFICATION_SERVICE
You can find more information about these classes and interfaces in the related class and interface documentation in the system.