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The screen protector frame sets on the front and then the front frame piece attaches directly to it and fits snugly on the iPad 2. In other cases the screen protector piece is part of the front frame.
There are openings along the plastic frame for all ports, cameras, and other parts. The slits you see in the plastic are where the silicone outer shell attaches.
There are also openings on the back plastic frame piece for all ports.