What is minimumally needed to activate TRAMP?

[Live System User]

Hi,

        What is minimumally needed to activate TRAMP?

        I tried the following on the current master:

0. emacs -Q -nw

1. C-x C-f /ssh:/localhost:/tmp/test.txt

   I then see the message:

Use M-x make-directory RET RET to create the directory and its parents

   What directory is attempted/needed to be created
   and why?
   
2. ESC-x list-buffers

    test.txt                  0 Text             /ssh:/localhost:/test.txt


    I then type something in the buffer and then try to save it:

3. C-x C-s
Save file /ssh:/localhost:/test.txt? (y, n, !, ., q, C-r, d or C-h) y
Saving file /ssh:/localhost:/test.txt...
Directory ‘/ssh:/localhost:/’ does not exist; create? (y or n) y
files--ensure-directory: Creating directory: Permission denied, /ssh:


   Typing `ls -l /tmp' on a terminal command line:

-rw-rw-r--.  1 liveuser liveuser    15 Oct 15 14:08 
'#!ssh:!localhost:!test.txt#'

4. ESC-:
Eval (file-remote-p default-directory)
nil

5. ESC-:
Eval: (file-remote-p buffer-file-name)
nil

6. ESC-:
Eval: (buffer-file-name)
"/ssh:/localhost:/test.txt"


    It appears that TRAMP is not fully
    activated by default.

    What minimun configuration is necessary?

    Thanks.