code: def install_handler(self, event_type, handler, user_handle=None):
          
  
          return self.visalib.install_visa_handler(self.session, event_type, handler, user_handle)
docs: Installs handlers for event callbacks in this resource.
  
          :param event_type: Logical event identifier.
          :param handler: Interpreted as a valid reference to a handler to be installed by a client application.
          :param user_handle: A value specified by an application that can be used for identifying handlers
                              uniquely for an event type.
          :returns: user handle (a ctypes object)