Posted by:
Puck (---.sfldmidn.dynamic.covad.net)
Have any of you read the Chrestomanci series by Diana Wynne Jones? It's not exactly the same, but in her books enchanters can be summoned (intentionally or not) by calling their names outloud. (There is a charming scene where Chrestomanci explains why his bathrobes are as fancy as robes of state: he never knows when he might be called away unexpectedly!)
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Metaphors be with you!