What is the difference between COM+ and DCOM objects?

[rrossenbg]

What is the difference between COM+ and DCOM objects?
When and how to use the one and the other?
What is the difference between COM server and COM library?
Where can I find simple examples of all of them?

[guestgulkan]

http://en.wikipedia.org/wiki/Component_Object_Model

http://en.wikipedia.org/wiki/Distributed_Component_Object_Model

As for usage and programming information - see MSDN