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Logically, a node is a location for netlets in the Jtrix universe. Only netlets on the same node can converse directly using Jtrix mechanisms.
A node is also an administrative domain, i.e. it defines a set of administrative policies.
Typically, a node would span one or more Java JVMs on one or more computer. It is also possible to run multiple nodes inside the same JVM, although this seems useful only for simulation and demonstration purposes.