You could check out my Shortcut Plugin, it has remote Control build into it.. Beign able to control your messenger and send messages through Telnet or any other Socket connection....
Unfortunalty you can NOT see the messages recieved or send... so... In this case I don't think there is much use for it...
One of my projects that I have in line is a fully remote controllable plugin so you can fully control and recieve messages through the Telnet client or whatever you want... then it would be possible for devolopers to make their own GUI that uses this connection so you would be able to do this using a small and simple exe file...
... I have yet not started on this new plugin but I will hopefully sometime... ATM I'm busy with PolTaab(TabbedMSN), and was really working an a autoresponder...