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Distributed computing and distributed object systems are designed to allow software modules or objects to work together where the objects can be located on different computers connected by a network. Interactive computer simulations and computer games can use object-oriented programming languages such as C++ to maintain a database of entities, player characters, monsters, tanks or just about anything that can exist in a simulated world.   
How ReplicaNet works
Using an object description language or by programmatically registering filter classes each machine knows how to create and update each C++ class object. Each object is then treated as a potential network shareable object on the machine that allocates it. This machine has control over the C++ classes and can change variables or call member functions as normal. Once the object is ready to be shared to other machines the object is published on to the ReplicaNet network session. The underlying ReplicaNet software detects changes in the object and automatically updates the replicated classes on the machines connected to the network session. Any changes made to the member variables of the C++ classes can be extrapolated by ReplicaNet using several pre-defined filters to reduce the amount of network traffic when transmitting changes in the object.
Products using ReplicaNet include
- Marathon 2: Durandal  
- Virtual Interactive Combat Environment
- Urban Chaos: Riot Response 
- Universal Combat 
- Sector 13
- Airburst Extreme XBLA
Book references to ReplicaNet
Game Programming in C++ Start to Finish by Erik Yuzwa http://gameprogrammingstarttofinish.wazooinc.com/
Massively Multiplayer Game Development 2 - Page 220 - Charles River Media.