Possible Duplicate:
When and why should I implement IComponent, IContainer, and ISite?
There are various online docs about using IContainer and ISite (eg http://www.theserverside.net/tt/blogs/showblog.tss?id=pluginArchitectures), and there are vague examples around, but I haven't come across a real instance (other than winforms) where it is actually useful. It doesn't help that I don't really know what exactly it can be used for. Has anyone use the .NET container interfaces & corresponding classes in their own code, independantly of winforms, and how have you used them?