I'll add to that, I just looked it up and it is what I suspected:
"RUFZ" is the abbreviation of the German word "Rufzeichen-Hören" which means
"Listening of Callsigns" and is training-software to improve CW-abilities,
particularly the listening of usual amateurradio-calls.
It should be used by an advanced CW-operator to perfect memory-copying at
higher speeds.
Otherwise the CW-initial-speed can be selected very low, so also newcomers
have a good training possibility.
For learning CW RUFZ is not suitable. In this case you should use other
CW-training-programs.
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