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If you want to force it, see the KIOSK stuff of KDE.

If it is volunteerly, just remove the shortcuts with the Control Center.

Have a nice day!

About the CTRL+ALT+BACKSPACE you probably need to edit the X configuration file. All GUI events follow the order
X -> Win manager -> Application -> Widget1 -> ...
So if you disable events at the Window manager level the CTRL+ALT+BACKSPACE or CTRL++ will still do their function.

Any way it will be difficult to control or disable all the shortcuts because if the user also runs KDE he will have control over the global shortcuts and not the application

I am sure that the KIOSK people would have solutions for such problems. (You do not want a user of for example an Internet Cafe exit X-Window either.)

However you are probably right that a solution at X-Window level exists.

As for disabling changing shortcuts, I am pretty sure that this can be done in the KIOSK modus.

(Info about KIOSK: see kdelibs/kdecore/README.kiosk in KDE's source or in WebCVS:
http://webcvs.kde.org/cgi-bin/cvsweb.cgi/kdelibs/kdecore/README.kiosk )

Have a nice day!

Quoted

About the CTRL+ALT+BACKSPACE you probably need to edit the X configuration file.

Yes, CTRL+ALT+BACKSPACE and ctrl-alt-+ can be disabled via XF86-config.

Section "ServerFlags"
#DontZap # disable <Crtl><Alt><BS> (server abort)
#DontZoom # disable <Crtl><Alt><KP_+>/<KP_-> (resolution switching)
AllowMouseOpenFail # allows the server to start up even if the mouse doesn't work
EndSection

but i dont know how to disable CTRL-ALT-F1...