ulParam1 (ULONG)

      This parameter can contain any of the following flags:

      MCI_NOTIFY

        A notification message will be posted to the window specified in the hwndCallback parameter of the data structure pointed to by the pParam2 parameter. The notification will be posted when the action indicated by this message is completed or when an error occurs.
      MCI_WAIT
        Control is not to be returned until the action indicated by this message is completed or an error occurs.
      Digital Video Extensions

      The following additional flags apply to digital video devices:

      MCI_DGV_WHERE_DESTINATION

        This flag indicates that the destination display rectangle should be returned in the rc field of the data structure identified by pParam2.
      MCI_DGV_WHERE_SOURCE
        This flag indicates that the video source rectangle should be returned in the rc field of the data structure identified by pParam2.
      MCI_DGV_WHERE_ADJUSTED
        Used with either MCI_DGV_WHERE_SOURCE and MCI_DGV_RECORD or MCI_DGV_WHERE_DESTINATION and MCI_DGV_RECORD. When MCI_DGV_WHERE_ADJUSTED is specified, these commands return the coordinates that will actually be used to record a movie or get an image buffer based on what was set with MCI_PUT in combination with the capabilities of the capture hardware.
      MCI_DGV_WHERE_WINDOW
        This flag indicates the current location of the video window relative to its parent should be returned in the rc field of the data structure identified by pParam2.
      MCI_DGV_MONITOR
        This flag indicates the window size and position for the monitor window.
      MCI_DGV_RECORD
        This flag indicates the source and destination rectangles for the video capture.
      Video Overlay Extensions

      The following additional flags apply to video overlay devices:

      MCI_OVLY_WHERE_DESTINATION

        This flag indicates that the destination display rectangle should be returned in the rc field of the data structure identified by pParam2.
      MCI_OVLY_WHERE_SOURCE
        This flag indicates that the video overlay source rectangle should be returned in the rc field of the data structure identified by pParam2.
      MCI_OVLY_WHERE_WINDOW
        This flag indicates the current location of the video window relative to its parent should be returned in the rc field of the data structure identified by pParam2.

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