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DVD Dual means that the drive can burn both media types (both + and - media). Some drives only burn 1 type. DVD Super Multi is a drive that will support DVD -, + and RAM media. Personally, I think compatibility is better for the - media since more players support this media type (out before + media and more standardized vs RAM media).
There are some multiregion DVD players out there. They are perfectly legal, but they tend to be pricey and rare. And if you are the jet-setting type who is likely to pick up foreign flicks in the first place, you probably want to watch them on the go using your laptop.