Geometry of "unlock Computer" window   

Hi,
I would like to change the position of "unlock computer" window which we get 
after pressing keys "ctrl+alt+del" -> Lock Computer.
I would be thankful if you could let me know where the geometry of this 
window is stored.

Thanks & regards,
Preeth

date: Wed, 9 Jul 2008 05:33:00 -0700   author:   Preeth