Sharing your Mac’s Internet connection
Make your Mac into an internet router! Sometimes it’s convenient to use a friend’s internet connection for a moment, when visiting them at a hotel, or a Starbucks, for instance. You can share to and from many of your connections, including airport (wifi), ethernet and even firewire.
Visiting a friend at the Hyatt Regency yesterday to listen to his presentation at the InHowse Designer conference (brought to us by How Design ), I found myself in his room afterward. He could get internet access through an ethernet cable by his desk, or through WiFi, however, the connection is good for only one computer… unless, you use that one computer to provide access to other computers.

