Can i build an add on to MSN LIVE?

Is there a way i can build an add on to (MSN) Messenger Live? I heard its been done by something called MSN PLUS but i havent tried it and have a feeling it uses开发者_开发知识库 hacky methods.

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Yes you can, there is one often used add-on called Messenger Plus (some don't use it because of suspicious optional bundled software).

This looks like a good starting point.

(also, I think Windows Live Messenger have dropped the MSN prefix)