This message is sent after a window has been moved.
wParam
This parameter is not used.
lParam
Contains the new location of the upper-left corner of the client area of the window. This new location is given in screen coordinates for overlapped and pop-up windows and parent-client coordinates for child windows. The x-coordinate is in the low-order word; the y-coordinate is in the high-order word.
The MAKEPOINTS macro can be used to convert the lParam parameter to a POINTS structure.