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.
      MCI_TO
        This flag indicates that the ulTo field of the MCI_SEEK_PARMS data structure specifies the ending position of the seek operation. If the ulTo position is beyond the end of the media or segment, an MCIERR_OUTOFRANGE error is returned.
      MCI_TO_START
        This flag causes the device to seek to the first playable position on the media. This is not necessarily position 0.
      MCI_TO_END
        This flag causes the device to seek to the end of the media.
      Digital Video Extensions

      The following additional flag applies to digital video drivers.

      MCI_TO_NEAREST_IFRAME

        This flag causes the device to seek to the nearest I-frame preceding the point specified by MCI_TO.
      Videodisc Extensions

      The following additional flag applies to videodisc device drivers.

      MCI_VD_SEEK_REVERSE

        This flag initiates a seek backward.


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