The built-in firewall in Windows XP Service Pack 2. It provides a stateful inspection of packets which accepts only responses to requests originated by the user. This prevents outside requests for data from entering the computer, unless specifically allowed by the user. However, spyware programs are often clandestinely installed in a user's computer which then make seemingly legitimate requests that a stateful firewall will allow responses to. Windows Firewall superseded Internet Connection Firewall (ICF) and is turned on by default. See firewall and XP SP2.
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