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WM_MOUSEMOVE
This message is sent to a window when the mouse is moved over it. If a
window has captured the mouse by calling SetCapture(), then this message
will be sent to that window regardless of where the mouse is on the screen.
Parameters
wParam is set to the shift state of the keyboard. This lets the
application distinguish, for example, between moving the mouse with no
keys held down and moving the mouse with the shift key held down.
LOWORD(lParam) is the 0-based screen coordinate of the column that the
mouse is on.
HIWORD(lParam) is the 0-based screen coordinate of the row that the mouse
is on.
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