[android-developers] At what point does android know the exact key that was pressed?

I built the android source and running it in the Eclipse debugger, am
trying to understand where is the point in the calling sequence when
it has all the information about the event.
So I run the calculator and press key '1'. There is a breakpoint at
EventListener.onClick()
In the call stack I see the event being dispatched; ViewRoot calling
PhoneWindow calling Panel, Layout, Button etc. until the handler is
reached.
questions:
1) At what earliest point in the call hierarchy can I insert a println
saying, "Key was pressed, value is 1"?
2) At what point does it know whether it was a soft key or a physical
key?

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