**For internal use only** Provides the hierarchical data model of IC2D.
The IC2D object is the higher level object. IC2D object knows about one World object that represents the world of all computers connected to the network. One world object knows about many host objects. Each host object knows about 0 to many JVM existing on that host. Each JVM may hold 0 to many nodes. Each node knows about 0 to many active object.
@author ProActive Team @version 1.0, 2001/10/23 @since ProActive 0.7