Wb, the distributed whiteboard tool designed and implemented by McCanne and Jacobson, is the first application based on the Scalable Reliable Multicast framework.
It attempts to follow the core design principles of transmission control protocol/Internet protocol (TCP/IP).
It requires only the basic IP delivery model with possible duplication and reordering of packets and builds reliability on an end-to-end basis.
It provides an efficient means to transmit data to multiple parties.
This is an issue in many reliable multicast protocols because of state explosion and message implosion effect.