> ! `posn-window': The window or frame of the event end.

If we start talking about "event ends" here we should export that

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concept to the remaining ‘posn-*’ functions as well.

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> ! If POSITION is outside the frame where the event was initiated, return

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> ! that frame instead.  POSITION should be a list of the form returned by

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I suppose this is not sufficient: We get a frame also when the mouse is

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on its tool or menu bar, some of ist borders ...

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But note that I've never been able to understand the purpose of these

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‘posn-*’ functions and they usually confuse the hell out of me.  IMHO it

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would make much more sense to declare them obsolete and concentrate on

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describing event structures better.