If we want to consume a COM component from a .Net application then first it should be converted into RCW which can done in either of 2 ways:
Validation of a String Using Trim Operations
The article looks very useful to me. I am not at the moment working with COM objects that this article can help with but I think it will help when I need it. In fact, in the future, I might have a use for it in situations that I did not even know there is something I could use but now I know.
But overall how is the article?
You should define what a RCW and CCW are. Is a RCW a Runtime Callable Wrapper and a CCW a COM Callable Wrapper?