assign none to COM thread model

[George2]

Hello everyone,


As mentioned in the book ATL Internals, when assign none to COM thread model,

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If there is no ThreadingModel given in the registry, COM will assume a legacy single-threaded class and access the class object from the process's first STA, creating a new STA is necessary. This protects objects from having to synchronize access to global, static, or instance data.
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I do not understand why "This protects objects from having to synchronize access to global, static, or instance data"? Any ideas?


thanks in advance,
George