Summary:	Specifies the refnum for the external node terminal.
Type:	Refnum, class: Generic.GObject.Node.Structure.MultiFrameStructure.Sequence.ExternalNode
Details:	Used in PropType for internal wiring generation. Pass into C:\Program Files\National Instruments\LabVIEW 7.1\Utility\XNodeSupport.llb\XNodeParts.vi to retrieve the internal terminals for dynamic internal code generation.