ITS didn't really have password control, one was technically added but IIRC it was a fig leaf on some requirement from outside MIT. The user accounts were there

ITS didn't really have password control, one was technically added but IIRC it was a fig leaf on some requirement from outside MIT. The user accounts were there mostly to inform others who was logged on and who owned what process. You could login either using terminal through ARPAnet dial-in support, or later over network, and over time there was added a more concrete "tourist" policy. DonHopkins seems to have an interesting writeup https://donhopkins.medium.com/mit-ai-lab-tourist-policy-f73b77075631 https://donhopkins.medium.com/mit-ai-lab-tourist-policy-f73b... and of course there's PDP-10 org and its gather docs on github: https://github.com/PDP-10/its https://github.com/PDP-10/its