1. Can I write to two different files using two NSFIleHandles from two threads 
at the same time?

Yes.

2. Can I read from a single file using two NSFileHandles on two threads at the 
same time?

Why would you need to do that in the first place?  Unless you’re reading a 
single byte at a time, it sounds like a sure-fire way to get corrupted data, 
regardless of whether you’re using NSFileHandle or good old POSIX methods.  I 
don’t think there’s inherently dangerous about the operation itself, but the 
resulting data buffers are probably going to be gibberish.

Dan
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