the ntp check does what?

The man page:
xymonnet also implements a check for NTP servers - this test is called "ntp". If you want to use it, you must define the NTPDATE environment variable to point at the location of your ntpdate<http://max.starfss.com/xymondev1/help/manpages/man1/ntpdate.1.html>;(1) program.

what does this check?

Does it check that this host can talk to ntp - or that ntp is running on this host?

thanks

Bakkies