How to disable x-server shutdown with ALT-F4

[Ralf Habacker]

Hi,
kde uses extensivly the ALT-F4 key for closing apps.
In xfree 4.1.0 (not in older versions) ALT-F4 causes xserver shutdown, like
found in the user guide,
so the described functions doesn't work.
Is there any possiblity to disable this ?

Ralf