pDraginfo (PDRAGINFO)

      Pointer to the DRAGINFO structure allocated by the source window receiving the message.

    hwndTarget (HWND)

      Handle of the target window that the drag set was dropped on.

      Note: If hwndTarget is equal to zero, the drag is canceled, and the drag set is not dropped. DrgCancelLazyDrag posts a DM_DROPNOTIFY message with an hwndTarget value of zero to the source window.

    ulReserved (ULONG)

      Reserved value, must be 0.

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