Run conky over LightDM

Is it possible to have my conky gadgets run over my lightDM login screen? If so, how would I go about this? I saw someone doing it with XDM under debian in this screenshot from a thread on the archlinux forums

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Yes it is.

The idea is that you edit your lightdm configuration file (/etc/lightdm/lightdm.conf) and set the greeter-setup-script variable to start conky.

A complete example might be found at: http://vogelchr.blogspot.com.br/2012/11/ligthdm-custom-app-on-login-screen.html