NodeIterator should override this method if they "lend" Node instances to
other JVMs and they require an on-line connection to those JVMs in order to iterate the Node instances
that have been "lent".true if and only if iterator() will iterate
all live instances of the specified subtype of Node.Nodes in the system.Nodes in the system.Nodes in the system, even nodes which are not attached to the main
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