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The secure area outside the antivirus labs. Devices with Internet access are barred from the labs, including Wi-Fi enabled laptops and 3G mobile phones. This is because they risk either infecting the closed networks within the labs, or being infected themselves by malicious code on the virus sample testing network.
Visitors must pass through two security gates to get to this point. There is still a third security gate restricting access to the labs.
The antivirus labs uses heuristic algorithms and signature detection to analyse rogue code. The different systems for analysis and testing of malware samples are physically separate, to avoid one system infecting the other.