@Archimage side note but somewhat relevant: I heard an interview on the radio last week about how pretty much every culture understands the handshake. The researcher’s theory was that it had come out of our biology of having these dangling limbs; far safer to cautiously touch using those rather than going in for a hug or something. So perhaps instead of “hello” the machine version might be a mutual handshake protocol…establishing whether a connection and shared information is possible?