Hi,PJM_labview
Thank for your help.It solved some of my problems,but how to get those refnums in another vi as Tunnel_Wiring_Wizard.vi does?Just to run Tunnel_Wiring_Wizard.vi ,select tunnels in another vi,then your can operate on its block diagram(need not to specific the target vi by its path or name manually)
Hope i don not waste your too much time.Regards