Earlier quoted context omitted.
Not much because a click on a menu would almost halt the entire network by design. Cheaper dumb Unix terminals were a thing where you jut used telnet and X forwarding.
“Just used Telnet” and “cheaper dumb Unix terminals” .. hmm .. not to be bold or anything, but I’ve been using Unix since the folding paper terminal days .. and as I remember it personally, it kinda went like this: paper-terminal connected to modem (telephone suction cup model) .. hazeltine serial terminal and either 2 long RS232 cables strung to the ops room if you were local, or a HAYES modem or two .. but still on…
TCP/IPover serial lines is a thing!