EDT had rubber condom overlays for the Vt100 so you could know what numberpad key to use for magic edit, and the "gold" key which I thought was a superbad name for Meta.
I still have my cherished VT125 EDT rubber overlay from when I worked at DEC '82-'85. Great editor. And the amazing thing was that there could be 50 people time-sharing on a single 1 MIPS Vax 780, and EDT was very responsive, virtually no lag.