WinWindowFromPoint - Parameters

hwndParent (HWND) - input

Window handle whose child windows are to be tested.

HWND_DESKTOP

The desktop-window handle, implying that all main windows are tested. In this instance, pptlPoint must be relative to the bottom left corner of the screen.
Other
Parent-window handle.

pptlPoint (PPOINTL) - input

The point to be tested.

Specified in window coordinates relative to the window specified by the hwndParent parameter.

fEnumChildren (BOOL) - input

Test control.

TRUE

Test all the descendant windows, including child windows of child windows
FALSE
Test only the immediate child windows.

hwndFound (HWND) - returns

Window handle beneath pptlPoint.

NULLHANDLE

pptlPoint is outside hwndParent
Parent
pptlPoint is not inside any of the children of hwndParent
Other
Window handle is beneath pptlPoint.

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