setting default desktop in gdm

[Jonathan Nadeau]

Hello list,

I was wondering how do I set the default desktop in gdm? I know under 
lightdm I can go to /etc/lightdm/lightdm.conf

Where should I go for gdm to set the default desktop. I understand you 
can do it at log in but i'm blind and gdm isn't accessible. So i need to 
set it from the gdm.cond But I didn't see such a file. I did find the 
greeter file but not sure how to  edit it to make the change. Also I'm 
not sure if that is even the right spot. Any help is greatly 
appreciated. Thanks for the great release!