Dell Dimension 2200 Owner's Manual page 61

Face the front of the computer. Place your left hand on the left side of
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the computer. Push back the release latch at the top-back edge of the
computer to release the computer cover into your left hand.
computer cover
release latch
CAUTION: Keep your hands clear of the metal edges on the
computer.
Lift the cover out from the curved hinge at the bottom of the
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computer.
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Adding Parts