Templates are usually something that has a "name" and "register 0", see
http://nagios.sourceforge.net/docs/3_0/objectinheritance.html
The suggested filename for those unregistered services is %pynag_directory%/templates/%object_type%.
Might look something like /etc/nagios/pynag/templates/host.cfg:
define host {
name generic-lawnmower
notification_period sunny-days
register 0
}
Hope this is clear as mud.. ;-)
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Tommi