You can find the answer from ns-docs -Ya On Mon, 15 Oct 2001, [iso-8859-1] G�ran Nylen wrote: > Hello > > As you all know, NS uses two languages, C++ and Tcl. > > When an object needs to be referenced from both languages, a shadow copy is > created. > > My question: In ns-2, is it the tcl or the C++ object which is called the > shadow object? > > Regards, > G�ran >