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Re:Absolute Beginner's Guide to Emacs (2012) by TeMPOraL on Tuesday December 04, 2018 @05:06PM (#18604018)
SSH isn't the only protocol supported by Tramp (from what I hear, it's actually a late addition). Essentially, if you can get somehow get a shell on a remote machine, you can make Tramp work with it.
Re:Absolute Beginner's Guide to Emacs (2012) by anyfoo on Tuesday December 04, 2018 @08:56PM (#18605173)
It might be possible to get tramp working over a serial line (while still being able to use the same shell, though?), or over telnet, but practically I'd probably just type "vi" to quickly edit a file.

Again, I'm saying that as someone who uses tramp-mode all the time, otherwise.