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Flash has two basic features: 1) It can run fullscreen, hogging all input, and 2) it can hang. At that point, the user won't be able to regain control of the console without some equivalent of the Windows three finger salute, or a remote login.
But OSX has such a thing as system-wide keyboard shortcuts that applications shouldn't be able to disable, like the Exposé button and a Win9x-ish "kill app" three finger shortcut. I'm sure kawai is knowledgeable enough about OSX to remember about both. Yet he still had to do a hard reset.