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_ENABLE_CONNECTOR
        Enables input or output through the specified connector.
      MCI_DISABLE_CONNECTOR
        Disables input or output through the specified connector.
      MCI_QUERY_CONNECTOR_STATUS
        Queries the status of the specified connector and returns the result in the ulReturn field of the parameter data structure pointed to by pParam2. The possible states are enabled or disabled.
      MCI_CONNECTOR_TYPE
        Indicates 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 interpreted as a relative index rather than an absolute index. The following connector types are currently defined:

        MCI_MIDI_STREAM_CONNECTOR

          Digital input or output for the sequencer device. This data typically is streamed to an amplifier mixer device.
        MCI_CD_STREAM_CONNECTOR
          Digital output for a CD audio device capable of reading the data directly off a disc. The data typically is streamed to an amplifier mixer device.
        MCI_WAVE_STREAM_CONNECTOR
          Digital input or output for the waveform audio device. The data typically is streamed to an amplifier mixer device.

          This connector type is not supported by the digital video MCD.

        MCI_XA_STREAM_CONNECTOR
          Digital output for the CD XA device. The data typically is streamed to an amplifier mixer device.
        MCI_AMP_STREAM_CONNECTOR
          Digital input or output for an amplifier mixer device.
        MCI_HEADPHONES_CONNECTOR
          The connector on the device that is typically used to attach headphones to the device.
        MCI_SPEAKERS_CONNECTOR
          The connector on the device that is typically used to attach speakers to the device.
        MCI_MICROPHONE_CONNECTOR
          The connector on the device that is typically used to attach a microphone to the device.
        MCI_LINE_IN_CONNECTOR
          The connector on the device that is typically used to provide line level input to the device.
        MCI_LINE_OUT_CONNECTOR
          The connector on the device that is typically used to provide line level output from the device.
        MCI_AUDIO_IN_CONNECTOR
          The connector on the device that is typically used to provide audio input to the device.
        MCI_AUDIO_OUT_CONNECTOR
          The connector on the device that is typically used to provide audio output from the device.
        MCI_VIDEO_IN_CONNECTOR
          The connector on the device that is typically used to provide video input to the device.
        MCI_VIDEO_OUT_CONNECTOR
          The connector on the device that is typically used to provide video output from the device.
        MCI_UNIVERSAL_CONNECTOR
          A connector on a device that does not fall into any of the other categories. This connector type can be used to access a device-dependent function. The manufacturer of the device should define the exact use of this connector.
        MCI_CONNECTOR_INDEX
          Indicates that the ulConnectorIndex field contains the connector index for the primary device. If this flag is not specified then an index of 1 is assumed.

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