C-M-Backspace problem

[kin techie com]

Hi,

I'd like to use C-M-Backspace in emacs, but current it is
bound to quit my desktop (gnome).

I did not bind C-M-Backspace in my .sawfishrc and I don't
see it in /home/kin/.sawfish/custom.  Also, I don't custom
define it in the "shortcuts" of the sawfish configurator.

So I'm at a lost to see where C-M-Backspace may be defined.

Any ideas?

-kin