Determines which, if any, of the child windows belonging to a parent window contains the specified point. The search is restricted to immediate child windows. Grandchildren, and deeper descendant windows are not searched.
HWND ChildWindowFromPoint( HWND hWndParent, POINT Point );
int ChildWindowFromPoint(int hWndParent, POINT Point) => _ChildWindowFromPoint(hWndParent, Point);