Understanding window client area

So, if I have 4 windows of the same size, 1 with none of the above, and then each of the others adding menu, status and toolbar (where window 4 has all of them), each window ClientHeight() should be smaller than the last?

Or should a toolbar be considered a "proper" gadget and not counted as part of the client area??


I know I could test this on say, win32, but I am just after the theory as to what *should* happen - so I know I'm doing it right myself...

thanks :-)