How to disable "switch user", change sessions etc. in kdm

How can I configure SLES11 (KDE4/kdm) so that one cannot change graphics session with e.g. ALT-CTRL-F8 and that the menu entry to switch the session is disabled in the graphic login screen?
I really want users to be fixed with the one session they logon to.
The reason for that is that we have a multiseat configuration and every time a user even tries to change the session/switch a user the assignment of mouse pointers to the seats is confused.



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