[Gandalf Parker]

Actually anonymous spells can be policed by the host. Almost anything can be policed by the host if it happens inside the game. Such as, in one game idea it was a necessary item that messages between players can be policed, but of course then messaging can be done by email or irc which is much harder to handle. But if it happens in the game then it will often appear in the game log if that option is turned on by the person running the game.

Gandalf Parker
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Nothing is impossible. Its a computer.
Impossible is a technical term which translates as "we can do it but its probably more trouble than its worth in most cases".