[K12OSN] how to turn off nautilus under IceWM

[Petre Scheie]

I want to modify the launch of nautilus under IceWM so that it doesn't automatically 
open the user's home directory upon login.  This used to be configured in 
/etc/X11/gdm/Sessions/IceWM back in the 2.x days (according to the wiki page, which I 
wrote).  But in 4.4.1 there is no such file; matter of fact, the only thing in 
/etc/X11/gdm/Sessions/ is a file called 'Reset your desktop'.  I can't even find the 
config file that tells gdm to list IceWM as one of the login options.  It's been a while 
since I fooled around with IceWM on K12.  Where is this stuff configured nowadays?

Petre