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CSFlim - if something is necessarily true, it is true across the entire range of possible worlds which accept the axioms you're currently dealing with. I know the argument under discussion is full of holes, but the one you're aiming at isn't such a hole as it looks. Because the argument (wrongly) deduces the existence of God from no axioms other than those that we assume are present in all possible worlds, it therefore would hold in all those worlds.
Totally with you there on the "it is silly", but it's definitely the case that if something is necessarily true then it is true in all possible worlds. That's the definition of 'necessarily' as people have been using it previously.
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I can't understand why people are frightened of new ideas. I'm frightened of the old ones. -- John Cage (1912 - 1992)
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