A serial port is a com port but a com port is not necessarily a serial = =3D port.=3D20 This is not true in windows. Com ports are always serial. So if you have com1 it is going to be a serial port. =20 Hth=20 Strictly speaking yes com ports are always serial in that information will travel one bit at a time, but some com ports can be infrared receivers, usb adapters for mobile phones, Etx. Usually the com ports which do not correspond to a standard 9-pin serial port on the back of your machine are the higher numbered ones such as com 3 and com 4. HTH -- To post a message to the list, send it to jfw@xxxxxxxxxxxxx To unsubscribe from this mailing list, send a message to jfw-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line. Archives located at: //www.freelists.org/archives/jfw If you have any concerns about the list, post received from the list, or the way the list is being run, do not post them to the list. Rather contact the list owner at jfw-admins@xxxxxxxxxxxxxx