You can use the Composite Application Explorer to navigate among the elements of the Composite Application perspective.
All elements of the perspective are arranged hierarchically. All applications are on the top level. Each application contains packages that group all the other objects (for example, application services, business objects or data types) together.
Each object type is represented by a different symbol or icon. For more information about which icons represent which object type, go to Icons Used in the Composite Application Explorer.