[RADIATOR] CountQuery

[MKS]

Hi list

This is from the manual

5.8.6 CountQuery
... For each entry, it is expected to return the NAS-Identifier,
NAS-Port and Acct-
Session-Id, IP Address and optionally a user name (in that order) of
each session currently
in the Session Database. The returned rows are counted, and if there
are apparently
too many sessions, SessionDatabase SQL will query each NAS and port to
confirm if the user is still on line at that port with that session
ID. If a user name is
present as the fifth field returned by the query,  *that is the user
name that will be used to
confirm the user is still on line*

How exacly does radiator query the NAS to see if the user is still online?

Regards
MKS