I *think* you are asking if you entered some sort of...shared dreaming space? Therefore I'm moving this to Beyond Dreaming. What about the dream and the people inside the dream made you feel it was anything different from a regular dream? I know you mentioned the people wandering about, but what about them makes you think they were real people and not regular dream characters? Sounds like an interesting dream though! I love these sorts of dreams.

Also if you are interested in common shared dreaming spaces, you should check out the threads in Deep Dreaming.