Nagios 4 querry handler support

I can see checkmk raw supports nagios 4. Is there a way we can use the nagios query handler which is available on nagios 4 from checkmk rather than the age old process_external_command1.

I would say that only the livestatus module is available for Nagios 4.

To your other question i cannot help as i don’t know what these query handler does.