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_QUERY_CONNECTION
        This flag specifies that the default connection associated with the indicated connector is to be returned in the pszToDevice, ulToConnectorType, and ulToConnectorIndex fields of the MCI_DEFAULT_CONNECTION_PARMS data structure.
      MCI_MAKE_CONNECTION
        This flag specifies that a default connection is to be established between the current device and the ulDeviceTypeID field of the data structure pointed to by pParam2. The precise connectors on each device can be indicated using the associated connector type and index flags.
      MCI_BREAK_CONNECTION
        This flag specifies that the default connection associated with the indicated connector is to be broken.
      MCI_CONNECTOR_TYPE
        This flag specifies that the connector type (ulConnectorType field) for the primary device is to be used for the query. When this flag is used the ulConnectorIndex field is used as a relative index rather than an absolute index.
      MCI_CONNECTOR_INDEX
        This flag specifies that the ulConnectorIndex field contains the connector index for the primary device. If this flag is not specified an index of 1 is assumed.
      MCI_TO_CONNECTOR_TYPE
        This flag specifies that the connector type (ulToConnectorType field) for the primary device is to be used for the query. When this flag is used, the ulToConnectorIndex field is used as a relative index rather than an absolute index.
      MCI_TO_CONNECTOR_INDEX
        This flag specifies that the ulToConnectorIndex field contains the connector index for the primary device. If this flag is not specified an index of 1 is assumed.

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