On Using Tramp which is a module that allows editing files on remote hosts using scp, ftp, or such...
To have it in place, you need, in $HOME/.xemacs/init.el, the following:
(require 'tramp)
Then, you can request editing a file on a remote host thus...
C-x C-f /[ssh/root@rg520-data-dotinfo]/etc/hosts
Tab completion works in various places...
Interesting protocols include ssh, ssh1, ssh2, scp, rsh, rsync, su, sudo, smb, ftp, telnet...