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This trick allows you to use your wireless-equipped Mac as an AirPort base station or to share your wireless connection over an ethernet cable to an Xbox or another Mac.
- Establish an internet connection with your Port A.
- Go to "System Preferences" > "Sharing" > "Internet" Tab.
- Choose Port A in the "Share your connection from:" pop-up.
- Check Port B in the "To computers using:" list.
- Click the "Start" button.

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