I know that polling is a very inefficient way of programming and reacting.(Always the polling delay)
But in this case it is the game on the PC which is doing it in the polling way. I was not expecting that.
So therefore I was puzzled and came not to the idea to use the pressed key functionality
in the Arduino Due.
I will take your advice into account when I got to program someything similar on the Arduino.
Thanks a lot
BR
Yougo