I miss rooms of green and amber screen terminals hooked up via serial cable. As an undergrad I remember figuring out how to escape from some menu to a TTY prompt that I could somehow telnet to anywhere from. Later, I would inherit a fleet of 200 of them spread across 12 branch libraries. I can't remember how it worked except that somehow all the terminals ran into two BSDi boxes in the core room of the central library, and it had been hardened so you could not break out of the menus and telnet to arbitrary places. Over a year I replaced them all with windows machines that ran version of netscape navigator as the shell with an interface that was built in signed javascript. It was the early days of the web, and we had to support over 300 plug ins for different subscriptions we had. The department that ran the campus network didn't want to let me on the network until I could prove to them everything was secure.

SSH was a replacement for RSH, not telnet.