Messenger client with plugin support

[Genbox]

Hi. I'm in the progress of making a messenger client that uses the dotmsn library, I figured it would be a good idea to make the application plugin aware, so I started some research on the subject. What I have come up with so far is that the .NET 3.5 framework contains a plugin architecture that sound like it's the best choice for me, but I have some questions about the way the plugin architecture is supposed to work. 1) How do i expose events and custom classes from the dotmsn library without forcing the plugin developer to include the dotmsn library in his project? I figure this would be impossible, but i ask anyway. 2) When developing my application plugin API (My exposed functionality to the plugin developers), do i create a wrapper that contains some events like Message_Received, that i call from my application, or do i just expose the existing events from the dotmsn library. (Literally building a plugin architecture to the dotmsn library instead of my client). Anyone that can shed some light on this subject is welcome. I have btw read all articles on the subject here on codeproject.com. Thanks!