It is used to build simple wireless or wired ns simulation topology.NSG2 can form a tcl file derived from the graph you draw.

Can be done. With a rather insane setup : ns-allinone-2.34/, rca/ ns-allinone-2.34/{ extras.tcl, ns-2.34/, ns-bsapp.tcl, stats.tcl } ns-allinone-2.34/ns-2.34/{ leach_test* mit/ tcl/ }