Section "ServerFlags"
    # Disable Ctrl+Alt+Backspace (X server kill)
    Option "DontZap" "true"

    # Disable VT switching (Ctrl+Alt+F1-F12)
    Option "DontVTSwitch" "true"

    # Don't allow clients to disconnect on exit
    Option "AllowClosedownGrabs" "false"
EndSection