How does the vmstat.rrd file get populated?

list Henrik Størner
Wed, 29 Jun 2011 21:29:41 +0200
Message-Id: <user-92da6aa72051@xymon.invalid>

How does the standard Xymon client send the file
$XYMONHOME/tmp/xymon_vmstat.hostname.12558 to the
server?

It is pasted into the normal client-message file. See the end of the 
OS-specific "xymonclient-OS.sh" script.

Regards,
Henrik