If you try to understand how the core of programming of Multi Protocol Instant Messenger aka All in One Chat Client, you can just study how they works through their code. Of course, the best way to get the code of Multi Client Service like that is just get the Open Source Software.
Open Source Multi Protocol Instant Messenger
Some of these Open Source Multi Protocol Instant Messenger below, might been reviewed in this blog, some others aren’t yet. Here are the lists of All in One Chat client with Open Source License (usually GNU / GPL License):


Those are some of example of Open Source Multi Protocol Instant Messenger. For others example of all in one instant Messenger (IM) with open source license such as QuteCom, qutIM, Fire, Fama IM, Empathy, EKG2, Colloquy, CenterIM, Kopete, SIM, Wippien, climm, and many more.
Tags: AIM, AIM AOL Messenger, ALL in One Messenger, AOL Instant Messenger, Chat Clients, Gadu Gadu, Google Talk, GTalk, iChat, ICQ, Jabber, MSN Messenger, Multi Protocol Messenger, QQ, Windows Live Messenger, Y!M, Yahoo! Messenger
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May 27th, 2010 at 11:00 pm
Thank you for posting this IM’s. I am using pidgin and now I am searching ig empathy can be used in windows. I love the interface its neat & clean