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_FROM
        This flag indicates that the ulFrom field of the play data structure is to be used as the starting position for the play operation. If this flag is not set, the current position is assumed.
      MCI_TO
        This flag indicates that the ulTo field of the play data structure is to be used as the ending position of the play operation. If this flag is not set, playback continues to the end of the media or segment, as defined by the device. If the to position is beyond the end of the media or segment, an MCIERR_OUTOFRANGE error is returned.
      Digital Video Extensions

      The following additional flags apply to digital video devices:

      MCI_DGV_PLAY_SPEED

        This flag adds a speed parameter. The units are specified by the currently set speed format. The speed value is in the ulSpeed field in the play data structure.
      MCI_DGV_PLAY_REVERSE
        This flag specifies to play in reverse.
      MCI_DGV_PLAY_FAST
        This flag specifies to play at the fast rate (twice the normal recorded playback rate).
      MCI_DGV_PLAY_SCAN
        Specifies to scan. Scan usually means to play as quickly as possible, with audio disabled.
      MCI_DGV_PLAY_SLOW
        This flag specifies to play at the slow rate (half the normal recorded playback rate).
      MCI_DGV_PLAY_REPEAT
        This flag specifies that the play operation be repeated until the command is superseded by another command or aborted.

        This flag is not supported by the digital video MCD.

      Videodisc Extensions

      The following additional flags apply to videodisc devices. MCI_VD_PLAY_REVERSE and MCI_VD_PLAY_SCAN are mutually exclusive. Only one of the other flags is allowed with this message.

      MCI_VD_PLAY_REVERSE

        This flag specifies to play in reverse.
      MCI_VD_PLAY_FAST
        This flag specifies to play at the fast rate.
      MCI_VD_PLAY_SCAN
        This flag specifies to scan. Scan usually means to play as fast as possible, with audio disabled.
      MCI_VD_PLAY_SPEED
        This flag adds a speed parameter. The units are specified by the currently set speed format. The speed value is in the ulSpeed field of the play data structure.
      MCI_VD_PLAY_SLOW
        This flag specifies to play at the slow rate.

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