Thomas> By the way -- is there some way to enter DDB from internal keyboard on
Thomas> a powerbook? If so, what keys do I have to press?

I was just playing with this issue. My machine is iBook/SE 366, and
pressing 
command + shift + power 
gets

db> prompt and at least 'next' get you back to normal state after that, 
although succeeding 'command + shift + power' does not work.
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(Makoto Fujiwara)