F17: Disable TTY2-x?

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http://forums.fedoraforum.org – Hi all! I want to create some kind of kiosk-pc and am using F17. So far, so good. One of the problems is, that I do not really know how to disable tty2-x or at least the key binding ctrl-alt-F2..x within KDE... Does anyone know how this can be done? Help would be really appreciated! Thanks in advance, Otto (HowTos)