ulParam1 (ULONG)

      This parameter can contain the following flags

      MCI_NOTIFY

        Posts a notification message to the window specified in the hwndCallback parameter of the data structure identified by ulParam2 when the action indicated by this message is completed.
      MCI_WAIT
        Does not return control until the action indicated by this message is completed.
      MCI_DGV_FREQUENCY
        Sets the frequency being sent to the device driver to the value in the ulFrequency field of the MCI_DGV_TUNER_PARMS structure. Overrides channel, region, and fine-tuning.
      MCI_DGV_TV_CHANNEL
        Sets the channel to the value in the ulTVChannel field of the MCI_DGV_TUNER_PARMS structure. Channel is used along with region and fine-tuning to calculate the frequency.
      MCI_DGV_REGION
        Sets the channel to the value in the pszRegion field of the MCI_DGV_TUNER_PARMS structure. Region is used along with channel and fine-tuning to calculate the frequency.
      MCI_DGV_FINETUNE_PLUS
        Indicates that the value in the lFineTune field of the MCI_DGV_TUNER_PARMS structure is positive. Fine-tuning is used along with region and channel to calculate the frequency.
      MCI_DGV_FINETUNE_MINUS
        Indicates that the value in the lFineTune field of the MCI_DGV_TUNER_PARMS structure is negative. In other words, multiply the value in lFineTune by -1.


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