STA (Single Threaded Apartment) COM Object - Spawn worker threads?

No, that's not a bad thing. Apartments explicitly exist to help you getting multi-threaded code working. An STA thread is a safe home for a COM server that's not thread-safe, COM's apartment threading model ensures that it is always used in a thread-safe way.

All you have to do is the marshal the interface pointer you want to use in the worker thread (IGlobalInterfaceTable for example) and you can call the methods without doing anything special.

Don't let the worker threads use COM in any way, and you should be fine. This means you can't call COM objects in the worker and you can't call COM runtime APIs from the worker... either directly or indirectly.

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