What happens to those mouse clicks … ?

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Whatever happens to those mouse clicks you make, usually when your computer is starting up and you get impatient waiting for it, that don’t get “assigned” to anything?
Does anybody know where they go, or some log that tells you something about them, if by some chance you know their co-ordinates?

Maybe we can start with keyboard work you do that goes nowhere? Same thing, but this time with the log, we’d have something to look for?!

Doesn’t seem to matter whether it’s Windows or Mac OS X, it happens everywhere?

Is there a mouse and keyboard (impatience) garbage tip?