ptspointerpos (POINTS)

      Pointer position.

      The pointer position is in window coordinates relative to the bottom-left corner of the window.

    ulReserved (ULONG)

      Reserved value, should be 0.

    ulresult (ULONG)

      Hit-test indicator.

      The application may return one of these values:

      HT_NORMAL

        The message should be processed as normal. A WM_MOUSEMOVE, WM_BUTTON2DOWN, or WM_BUTTON1DOWN message is posted to the window.
      HT_TRANSPARENT
        The part of the window underneath the pointer is transparent; hit-testing should continue on windows underneath this window, as if the window did not exist.
      HT_DISCARD
        The message should be discarded; no message is posted to the application.
      HT_ERROR
        As HT_DISCARD, except that if the message is a button-down message, an alarm sounds and the window concerned is brought to the foreground.

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