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Click the left mouse button (don't release it) and drag the mouse cursor over the screen. As you move over other windows they will get a highlight and a tip will show their window class. Here's what it looks like:
Once you release the left mouse button the window will be selected in Winspector's Window List.
Hold down SHIFT to create a Property window and hold down CTRL to open a Message window, or hold down both to get both.