Thanks for all the ideas. Just to clarify: this spring I modified the API of 
Universe to accommodate this form of 'multiple' keypresses. I have to work out 
examples and probably add one more handler to get this 'right' (for beginners). 
(The person who posted isn't really a beginner in the sense of novice but a kid 
who mastered a good amount of Java and was set loose on the beginning 
languages. Perhaps he should have been thrown at full Racket from the 
beginning.) 
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