Single player mode
An internal-only developer build of the Warhammer client that could run without a server. And he'd know, because he worked on it.
"There were no login or character selection screens,"
"There were no NPCs or other players. There was no gameplay of any kind. It was just you and the entire world spread out before you. You could fly around like Superman, or teleport anywhere at will. You could watch the sun rise and set over Altdorf, and see the smoke rise from fires forever burning. And you could see the thousands upon thousands of hours of work and craftsmanship that went into creating a world that has now been unplugged."
http://shinytoys.org/blog/war-in-a-bottle
