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Will such be based on the account or on the computer? I guess what I'd like ot see is what amounts to a profile based on the computer rather than just the account. The express skins go a long way to that goal.
I don't know, do the skins save per computer rather than per account? It's limitations of the software, I'd imagine images would be disabled/enabled per account. Since it will be such a quick on/off it really shouldn't be a problem.