multiple users, one emacs - how?

[Joe Corneli <jcorneli@planetmath.org>]

The closest I've found to an answer is the suggestion by Pascal
in the thread "howto: 2 users interactively edit the same file ?",

http://lists.gnu.org/archive/html/help-gnu-emacs/2005-10/msg00842.html 

I haven't had a chance to try this -- but I am primarily interested in
a solution that doesn't involve/require X (e.g. because me and my
collaborators are typically editing files in cybercafes, where it is
AFAIK impossible to determine an actual IP address for the computer --
if I'm wrong about this, I'd be willing to accept an X windows
solution).

Ideally (at least for now) what I'd like would be to have a copy of
emacs running on a computer somewhere where we'd log in via shell
accounts, and then we'd e.g. fire up an emacsclient and all get access
to that emacs's state.

It seems to be insinuated that (or anyway I've imagined) emacsclient
can actually do this.  (Cf. this thread:
http://lists.gnu.org/archive/html/help-gnu-emacs/2005-08/msg00226.html)

Is this the case?  Can emacsclient be used by multiple users to access
the same emacs through a shell?  Or, if not emacsclient, can anyone
suggest a good solution?