A very large number of applications communicate logically through a many-to-many multicast cloud on the common carrier Internet. Three types of systems operate together to implement the method. The first is a network enabled client application, such as a distributed simulation or game, which joins an application cloud or federation and communicates its internal state changes into the cloud via a communication applications programming interface. The second is a lobby manager or broker which accepts entry into a communication cloud or federation and provides information to the federation and the client application for establishing communications between them. And third, is an application-specific routing system which provides the normal function of routing packets between Internet hosts (client applications running on these hosts), but also allows the routing functions to affected by modules in the router which are associated with the distributed application or simulation being implemented.