public static extern NtStatus NtAlpcQueryInformation(
     SafeKernelObjectHandle PortHandle,
     AlpcPortInformationClass PortInformationClass,
     SafeBuffer PortInformation,
     int Length,
     out int ReturnLength
     );
 public static extern NtStatus NtAlpcSetInformation(
     [In] SafeKernelObjectHandle PortHandle,
     AlpcPortInformationClass PortInformationClass,
     SafeBuffer PortInformation,
     int Length);