... the form 'COMn' or the more general '\\.\COMn' The more general form is required for port numbers > 9. nParity codes: 0,1,2,3 -> none, odd, mark, even nStopBits codes: 0,1,2 -> 1, 1.5, 2 Returns a "handle" >= 256. A return of -1 means open failed. The handle must be used on all ...