With the jm.pubNub Java class you can exchange messages (and entire Dictionaries) between Max patches across the Internet.
No IP address or anything like this is necessary.
Furthermore it is possible to exchange data with practically anything that can make http-requests (Websites direct communication with the client browser not only via the websites server), Android devices, IPhone/Pad/Pod, gaming consoles and others.
My URL has changed. Therefore the link inside the help patch for demonstrating communication with websites is wrong. I will update the tool soon. Correct URL is: http://www.janmech.net/jmpubnub (.net NOT .de).