Question about instant messsage linking

Ok, I have a question that maybe some of you HTML gurus can answer. AIM instant messenger has a feature that lets you link to ur screen name on a webiste. When a user clicks on the link, his messenger window pops up and the conversation screen appears with my screen name. If I am on at the time, we can chat.

I know how to do this for AIM. I want to know if it can be done with MSN messenger. I have never seen it done with MSN, but it might be possible. Anyone know if it can be done?

Not shure how it works but it is possible. Several bulletinboard systems have that option for AIM, MSN and ICQ as well, I think Ikonboard and YABB have it.