How to Use More Than One Computer on the Same Phone Line
Windows offers Internet Connection Sharing (ICS), which allows you to use multiple computers on one dial-up connection. The modem on the first computer is shared to the second computer, so the second computer has access to the Internet without the need for a second phone line. The modem also automatically dials whenever either computer attempts to access the Internet.
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Instructions
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Click the Windows "Start" button on the computer that has the dial-up modem connected. Click "Control Panel" to open a new window. Click "Network and Internet," click "Network and Sharing Center" and then "Manage network connections." A list of all network cards and modems is shown in this window.
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Right-click the modem you use to dial up to the Internet. Select "Properties." If you are not logged in as an administrator, type the administrator password in the opened window and click "OK." The "Properties" window for the modem is shown.
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Click the "Sharing" tab. Check the boxes labeled "Allow other network users to connect through this computer's Internet connection" and "Allow other network users to control or disable the shared Internet connection." The second option makes the modem dial out when a connection hasn't been made and the second computer tries to access the Internet.
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Click "OK" in the "Sharing" tab to save the changes and close the configuration window. Click "Yes" to confirm that you want to reboot the computer. Reboot the second computer.
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