COM type library and Interface exposure

When you have a COM client that exposes an Interface for an out of proc COM s开发者_开发知识库erver to access, do you have to register the type library or .idl file with the system for the server to be able to access the interface?

I'm not sure if I can generate a proxy/stub DLL from this client process to register with the system.

Does it matter in what type of Apartment Threading the object implementing the interface is created or is this marshalling taken care of by the COM runtime?

I am not sure if my client is MTA or STA.

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Your client and server are in separate processes, so you will need marshalling anyway - threading models won't affect this. You can use any kind of marshalling suitable - typelib (automation) marshalling, proxy/stub marshalling, whatever else - this is up to you.