EchoNets, E-memes and Extended Realities
                    Scott Guthery, Schlumberger

It is often argued that central switches are necessary to support any
sort of network-style communication between a large number of people.  
While it is certainly true that such a switch adds valuable features to 
network communication in this article we will suggest that useful 
network communication is possible without a central switch.  The 
switchless network we have in mind called an EchoNet works by relaying 
messages from one personnal communcation device to the next. Since the 
owner of a node can decide whether or not to relay a message, we call 
these messages e-memes.  The paper reviews various algorithms for
communication on such a network.