comunicates with msn, yahoo, icq, and aim, can i do that? and how?

A quick google will probably reveal people who have done similar things already, at least as far as the main 3 or 4 are concerned (i.e. MSN, Yahoo, Aim and GTalk).

/- Sam Judson : Wrox Technical Editor -/

Trillian and Pidgin are a few examples of clients that allow users to connect multiple networks from one client so the answer to your question is yes you can do that.

In so far as how to do it, you will need to see if their is an SDK for the given service. A simple google search such as ICQ SDK should send in the right direction. Here are the SDK's for AIM and Yahoo:

http://dev.aol.com/aim
http://developer.yahoo.com/messenger/

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i found an SDK for all 4 of those IM's at http://www.imcomponents.com/FastIMCOM.html awesome.