code: def launch_host_event_handler(self, host):
          
          host.get_event_handlers(self.hosts, self.daemon.macromodulations, self.daemon.timeperiods,
                                  ext_cmd=True)
docs: Launch event handler for a service
          Format of the line that triggers function call::
  
          LAUNCH_HOST_EVENT_HANDLER;<host_name>
  
          :param host: host to execute the event handler
          :type host: alignak.objects.host.Host
          :return: None