dropline@rcserver:~$ dbus-send --system --print-reply --type=method_call --dest=org.freedesktop.SystemToolsBackends /org/freedesktop/SystemToolsBackends org.freedesktop.SystemToolsBackends.Platform.getPlatform
Error org.freedesktop.DBus.Error.AccessDenied: A security policy in place prevents this sender from sending this message to this recipient, see message bus configuration file (rejected message had interface "org.freedesktop.SystemToolsBackends.Platform" member "getPlatform" error name "(unset)" destination "org.freedesktop.SystemToolsBackends")
dropline@rcserver:~$