Keith Sklower's changes to support a single control network model for
ElabInElab experiments, so as not to consume an interface. I actually modified Keith's changes so that we can dynmaically choose the single or dual model in the NS file (Keith's changes hardwired the system to only single control network) since the single network model has the disadvantage of not allowing new nodes to be added to an inner elab, which would make it impossible to test some things (like the newnode path!). To choose the single control network model, place this in your NS file: tb-elabinelab-singlenet other it defaults to the older dual network model.
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