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Werner, many thanks,
Puttig following lines in syslnx64.cfg does the job:
LABEL knoppix64
KERNEL linux64
APPEND lang=nl xkeyboard=be keyboard=be-latin1 apm=power-off initrd=minirt.gz nomce...

I boot KNOPPIX 7.2.0 on a Toshiba Satelite P855, from a USB flash drive.
Note that booting from CD is not possible!
I have a Belgian AZERTY-keyboard (most options give a QWERTY-keyboard).
Setting...