Connecting from Outside
So you want to connect from your home/cybercafe/WIFI/whatever.
You will need an ssh client. And ask your favourite admin (Oriol) for a user/password if you don't already have one (it isn't the same as kimik/tekla)
from command line:
ssh user@betelgeuse.iciq.es -p 2004 -X
(where 'user' is your username)
for other programs, RTFM or ask admin for help.