4. In the Sharing tab, tick the Allow other
users to connect through this
computer's Internet connection and
Establish a dial-up connection
whenever a computer on my network
attempts to access the Internet boxes.
Note: The Establish a dial-up connection
whenever a computer on my network
attempts to access the Internet option
allows you to enable the Internet connection
on the computer connected to the modem, in
the event that there is no connection when
another computer tries to connect to the
Internet.
3.3.3. Enabling sharing