COM DCOM Question:
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What is In-proc?

Answer:

In-proc server is a COM component, when instance is the
server is loaded into the caller process space. In-Proc
server can be easily identified by .dll extension.

Out-of-Proc server is a COM component that run in its own
process space and for any instances created by the users, a
proxy is created within the users process space. Proxy is
responsible for interacting with the server to carry out
operation on behalf of the client. (.exe extension).

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How do you make a NET component talk to a COM component?Suppose we have object B and aggregated object C (in- proc server), created by B. Can you access any interface of B from C? What?s the difference between aggregated and contained objects?