Introduction Roadmap Shared Applications in the Mbone Background to NTE Scalability Resilience Loose Consistency Interactivity Usage modes Design Application Data Units Distributing the data model Clock Synchronisation Towards Reliability Inconsistency Discovery Scalable Retransmissions Sliding Key Triggered Retransmissions Limitations of the Data Model Effectively Simultaneous Changes to the Same Line Effectively Simultaneous Changes due to Transmission Delay Effectively Simultaneous Changes due to Network Partition Deletion of Lines of Text Moving of sections of text Garbage Collection and Check-pointing Effectively Simultaneous Insertion of Lines Summary of Inconsistency Avoidance Mechanisms Usability Issues Asynchronous Events - informing the user Block Locking Generalising the Models Distributed Virtual Reality General Idea and Problems Virtual Reality Operations, User Views and Networ Considerations Application Model The Distributed Virtual Reality Multicast Protocol, DVRMP Summary Jon CROWCROFT 1998-12-03