The "modification" they're talking about is probably a mod-chip. But it's basically a plain vanilla Dreamcast with a screen, so you'll only need a boot-disc (Gameshark, DC-X, etc.) to boot most imports. Homebrew/emulation-related stuff should work just the same as a regular Dreamcast.
For more info, <a href="http://dcemu.co.uk/treamcast.shtml">here's</a> a review.
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