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This is basically the best thing I've come up with for dealing with references. This could easily be converted to a messaging system because it acts on a command class and not a directly exposed API. Of course person could have its own class hierarchy but for the purposes of this example I didn't go into that. Block Diagram All Commands Call "Do.vi" DO.vi unwraps the In place element structure, and calls the dynamic dispatch instance of "Action.VI" which is in the command hierarchy Methods of "person.lvclass" are called within the individual "Action" VIs MultiCommand can call multiple commands without leaving the in place element structure. here is its block diagram, it is a recursive call Here is the output of this group of calls, it shows the unwrapping/wrapping of the reference I think this is basically the most extensible way to do a by reference API ~Jon DVR Intervace 9p0.zip