By common definition of threads, a process's variables are shared among all threads. (Wikipedia says: "In particular, the threads of a process share the latter's instructions (its code) and its context (the values the various variables have at any given moment).") That's not the case with threads, thus the term "fork emulation". It has nothing to do with the point at which execution starts. Yes, it's not a very accurate term, but it's not a slur either.
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