private static extern TwRC DSstatus([In, Out] TW_IDENTITY origin, [In] TW_IDENTITY dest, TwDG dg, TwDAT dat, TwMSG msg, [In, Out] TW_STATUS dsmstat);
private static extern TwRC DSMstatus([In, Out] TW_IDENTITY origin, IntPtr zeroptr, TwDG dg, TwDAT dat, TwMSG msg, [In, Out] TW_STATUS dsmstat);