in-process server considerations

Hello everyone,


Here is the comments from the book ATL Internals about in-process server considerations,

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Any thread that calls CoGetClassObject or CoCreateInstance must already have joined an apartment, or the call will fail immediately. So, does that mean all objects exposed from in-process servers must be equally at home in single-threaded and multithreaded apartments so that random clients isn't cause harm? Fortunately, no.
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Does it mean COM client (thread) and COM server no need to be the same type of thread model (e.g. STA, MTA, etc.)?


thanks in advance,
George