org.omg.CORBA.Object obj1 = orb.orb().string_to_object(ref1);
PerfTestInterface d1 = (PerfTestInterface) PerfTestInterfaceHelper.narrow(obj1);
OTSManager.get_current().begin();
d1.work();
org.omg.CORBA.Object obj2 = orb.orb().string_to_object(ref2);
PerfTestInterface d2 = (PerfTestInterface) PerfTestInterfaceHelper.narrow(obj2);
OTSManager.get_current().begin();