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_STEP_FRAMES
        This flag is used to set a step frames parameter. This provides step forward support. The step increment is specified in the ulStep field of the MCI_STEP_PARMS data structure.
      MCI_STEP_REVERSE
        This flag is used to set a steps in reverse parameter.

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