A scrolling view

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I'm planning on making a top-down shooter similar to Geometry Wars, but I don't know how to make a scrolling view. Here, let me explain what I mean...

Let's say for instance the resolution is 800x600. I only want to see a fourth of that and when I want to see the rest of the "world" when I move the ship/cursor to the border I need the view to move.

Any ideas? Any help? Anything is most appreciated.