Understanding window client area

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Hallo.

I'm just trying to understand what the client area (width / height) of a window is meant to represent.

I assumed it was meant to give the area where we are allowed to place our gadgets, and hence it would take into account the following :
* the height would be less if we have a menu
* the height would be less if we have a statusbar
* the height would be less if we have a toolbar

Are any of the above *not* true?