Jabber   HTTP Connection 
                  Demonstrates Jabber server access through 
                  firewalls via HTTP polling over port 80. 
                  Server-side install; no desktop installation or administration. 

The Jabber WebClient is an easy to use, cross platform instant messaging client. It is designed to let users participate in Jabber IM communities using their web browsers and without installing client-side software. Messages pass seamlessly through network firewalls, using a standard Netscape or Microsoft browser.