code: public boolean isUniqueShortDefaultBinding(String interfaceName)
      {
          // If there were no explicit bindings, and only one implicit
          // binding, then it is considered uniquie.                       d457053.1
          BindingData bdata = ivServerContextBindingMap.get(interfaceName);
  
          if (bdata != null &&
              bdata.ivExplicitBean == null &&
              bdata.ivImplicitBeans != null &&
              bdata.ivImplicitBeans.size() == 1)
          {
              return true;
          }
  
          return false;
      }
docs: Returns true if a short form default binding is present for the
  specified interface, and the current bean is currently the
  only bean with this short form default binding, and there are
  no explicit bindings.
  
  @param interfaceName name of the EJB interface to check for a
  unique short form binding.