pParam2 (PMCI_OPEN_PARMS)

      A pointer to the MCI_OPEN_PARMS data structure. Devices with extended command sets might replace this pointer with a pointer to a device-specific data structure as follows:

      PMCI_AMP_OPEN_PARMS

        A pointer to the MCI_AMP_OPEN_PARMS data structure.
      PMCI_DGV_OPEN_PARMS
        A pointer to the MCI_DGV_OPEN_PARMS data structure.
      PMCI_OVLY_OPEN_PARMS
        A pointer to the MCI_OVLY_OPEN_PARMS data structure.

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