I've only seen WoW give the option of Windowed, Maximized which allows for what Blindy is talking about.
At a 50% reduction in FPS in the game.
* NullDevice kicks the server. "Floggings will continue until processing power improves!"
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"That was black magic, and it was easy to use. Easy and fun. Like Legos." -- Harry Dresden
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That's what playing Ragnarok Online taught me: There's no problem in the universe that can't be resolved by the proper application of daggers to faces.