I found this excerpt from section 1 a very telling indicator of how times have changed since 1978:<p>"This memo is aimed at users unfamiliar not only with the Emacs
editor, but also with the ITS operating system. ... Emacs runs on
the ITS machines, AI, ML, MC, and DM. For people coming from an
Arpanet TIP, the host numbers are: 134 (AI), 198 (ML), 236 (MC), and
70 (DM). If you don't have a regular username there, ... (use) the
WHOIS program: :WHOIS XYZ. If WHOIS didn't find any regular user
XYZ, you can use that name. :LOGIN XYZ. You are now talking to
DDT, the top-level, monitor program ..."<p>A TIP was an Arpanet Terminal Interfact Processor. Each TIP had a telephone number known to Arpanet users, who could dial in to any TIP then connect to any Arpanet host. I recall there was no authentication at the TIP, each host was supposed to handle its own authentication.
Saw this on lobster.rs and noticed it hadn't been cross-posted.<p><a href="https://lobste.rs/s/3eea4k/introduction_emacs_editor_1978" rel="nofollow">https://lobste.rs/s/3eea4k/introduction_emacs_editor_1978</a>