Jabber (also known as XMPP) is an instant messaging(IM) system that is open,
unlike some other IM systems like MSN, AIM and Yahoo. This means that Jabber
works more like e-mail, in that every Jabber system can talk to any other
Jabber system. Jabber addresses look very similar to e-mail addresses, for
KTH has a Jabber system (kth.se) that is free to use for all students and employees at KTH. The Jabber address for all users is the same as their @kth.se e-mail address.