Seems kind of like Zwrite: text-only, ephemeral messages. It was just text that appeared in your terminal session. My friends and I used it in (engineering) grad school in the late 90&#x27;s.<p>Good god, there&#x27;s still a manual online: <a href="http:&#x2F;&#x2F;web.stanford.edu&#x2F;group&#x2F;privacyproject&#x2F;currentStateUnixAndZephyr.html" rel="nofollow">http:&#x2F;&#x2F;web.stanford.edu&#x2F;group&#x2F;privacyproject&#x2F;currentStateUni...</a><p>&quot;They have no control over what text the message replaces, but can always press the key combination control-L to restore their screen.&quot;