What is the difference between a Narrator and a Storyteller?
Narrators are PCs, too. They have characters and a role in the plot, though they may be called to run a scene or play an NPC for a time. Storytellers are always out of play unless as an NPC, and STs have greater authority. Also, the STs know all of the plot that is happening, while the Narrators are largely unaware of plans for plot. Narrators are in play so that smaller or more trivial scenes can be run without an ST, so the STs can have more eyes and ears in the game, and so a PC doesn’t have to find an ST when he wants to put up an Effect that doesn’t affect anyone but himself (e.g. Watch the Weaving).