'Question about fibers in Win32 documentation

I'm not really understanding the following description about fibers in Microsoft's Win32 documentation:

a fiber assumes the identity of the thread that runs it. For example, if a fiber accesses thread local storage (TLS), it is accessing the thread local storage of the thread that is running it.

What does "assumes the identity of the thread" in the first sentence mean? Can anyone explain this sentence in other way?

winapi


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