Keeping X from restarting after killing it

[Markus Lindström <mlindstr@ulb.ac.be>]

Hi there,

I think this thread is pretty self-explanatory. Actually, I want to 
install the binary nVidia drivers, and they require me to shut down the 
X server. Unfortunately, when using the ctrl-alt-backspace interrupt, X 
instantly respawns.

Where is this configured? I looked through the /etc/initrc file, and 
didn't find anything relevant to X.

Actually, I might as well ask if there's any way to configure two 
separate runlevels that are exactly identical, save the fact that one 
runs without X (à la Mandrakelinux).

Thanks in advance,
//Markus