BOOLEAN CpDoesPortExist( IN PUCHAR Address ); Routine Description: This routine will attempt to place the port into its diagnostic mode. If it does it will twiddle a bit in the modem control register. If the port exists this twiddling should show up in the modem status register. NOTE: This routine must be called before the device is enabled for interrupts, this includes setting the output2 bit in the modem control register. This is blatantly stolen from TonyE's code in ntos\dd\serial\serial.c. Arguments: Address - address of hw port. Return Value: TRUE - Port exists. FALSE - Port doesn't exist.