Thanks Judy and Carolyn During a massive tidy up, I have uncovered a cable with an Optacon connector at each end, found inside an Optacon bag. There is nothing tactile on either plug to indicate whether one is a master end or a slave end. We will try the cable between two Optacons later today. But, if you have joined together two Optacons, I presume the slave simply mimmicks the master, that is, the slave machine's camera and controls would be disabled? Or have I got it wrong? Maryto view the list archives, go to: www.freelists.org/archives/optacon-l To unsubscribe at any time, just send a message to: optacon-l-request@xxxxxxxxxxxxx with the word "unsubscribe" (without the quotes) in the message subject. Tell your friends about the list. They can subscribe by sending a message to: optacon-l-request@xxxxxxxxxxxxx with the word "subscribe" (without the quotes) in the message subject.