[omniORB] Which exceptions can be thrown by a call to _narrow() and when?

[ERIKSSON,TOBIAS (A-Sweden,ex1)]

Hi
 I'm trying to use narrow to tell me if the type of the object beeing
narrowed actually is of the type I want, 
I think that it will throw BAD_PARAM if they are not the same, is this
correct and are there any others?

 Regards
   Tobias