Difference between freshness_threshold and freshness_check_i

Hi

I am implementing passive host check methods

Could you tell me what is defference between freshness_threshold in services.cfg freshness_check_interval in nagios.cfg. Both are vague.

nagios.cfg
check_service_freshness=1
That will enable periodic freshness checks.

nagios.cfg
service_freshness_check_interval=1200
That will determine the how often (in seconds) Nagios will check the “freshness” of service check results.

In services.cfg
freshness_threshold 600
That is pretty much the same as the one in nagios.cfg, but in my case, I have made the one in services.cfg over-ride the one in nagios.cfg. So, bottom line, there is no difference, but services.cfg over-rides the one in nagios.cfg.

Thank you for your tips