I don't want to offend you , but this has made me even wonder more what the difference is.

It just feels that one is emulator if its philosophy is "it just works" and simulator if "well sit down kids I am going to give you proper documentation and how it was built back in my days"

but I wonder what that means for programs themselves...

I wonder if simulator==emulator is more truer than what javascript true conditions allow.

It's fuzzy.