If you turn on your computer's firewall, many times upon launching applications you will be prompted to either allow or deny that application access to the Internet. You may also wonder exactly why an application such as Microsoft Excel or Apple's Numbers would need Web access. In most cases these are for support features, such as help documentation, Microsoft's .NET, and the new iWork.com collaboration features from Apple, but there is no way of knowing that by the prompts the users gets.
