Let me guess: you are not regularly playing multiplayer computer games?

I totally feel hgs3's confusion when reading the discussion here or that website. I always confuse the use cases - "are they now talking about computer games, or are they talking about the broader scope of any kind of software in which multiple users can act concurrently within a shared environment?".

I think this confusion would be much less severe if I hadn't been an avid gamer for decades and thus had a very specific idea of the meaning of the term "multiplayer".