Share emacs --daemon between 2 users of same host

[João Távora]

Hi,

What is the recommended way to get 2 (or more) users, say A and B, of
the same *nix host, to simulteously connect to the same emacs daemon,
each using his own emacsclient?

1. If server-use-tcp is nil, user A starts an emacs daemon which creates
a /tmp/emacs<uid>/server socket.  A connects to it fine.  But user B
can't pass that as -s to his emacsclient because of insufficient
permissions.  This is even if A chown/chmods the socket to be more
permissive.

2. If server-use-tcp is t, the same user A now creates a
~/.emacs.d/server/server file.  Again, A connects fine, but B can't pass
thjat as -f to his emacsclient because of insufficient permissions.  But
even if A chown/chmods its, there is some code that still forbits it.

Is this at all possible?  I read here[1] that is and that you even get
two simultenous cursors if two users are in the same buffer.

Thanks,
João

1: 
https://www.reddit.com/r/emacs/comments/7d6hv0/real_time_collaboration_in_emacs/dpvhjvu