How can I use WM_NCHITTEST to indicate a mouse being outside the application area?

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Is there any way I can handle the WM_NCHITTEST message in the window procedure such that the mouse will "fall through" to the next application below?

Right now I draw a custom shadow decoration in a transparent area of my application window. When I mouse over the shadow, which should be "outside the application window", it is still intercepting the mouse from the window below.

I've tried sending HTNOWHERE and HTTRANSPARENT

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