.py File:
A D-Bus service providing a PolicyKit Mechanism. PolicyKit will 
control access to this service.

.services file:
Describes the D-Bus service, so D-Bus can start (activate) it 
when needed.
See http://dbus.freedesktop.org/doc/dbus-specification.html#message-bus-starting-services

.conf file:
A D-Bus security configuration file. This tells D-Bus to allow a user (root, in our case) 
to use the D-Bus service. Without this, no user could use it.
TODO: Where is this specified?


.policy file: Tells PolicyKit about the Mechanism, and what user-visible 
message to show when trying to authenticate to use it.
See http://hal.freedesktop.org/docs/PolicyKit/polkit-conf.html#conf-declaring-actions



See http://blog.fubar.dk/?p=94
