document: Virus hunting We all appreciate the need for , and hopefully we have all deployed , anti-virus software . The good news is that AV software has come a long way fast . Four or so years ago it was true to write that AV software could not detect Trojan Horses and similar intrusion attempts . Now it can and does . McAfee 's VirusScan , for example , goes one further ; it detects viruses , worms and Trojan Horses and deploys itself as a firewall to filter data packets , control access to Internet resources , activate rule sets for specific applications , in general to protect against hackers . But like so much software , we use it with little thought as to how it came to do its job . Behind the scenes there is an army of top notch programmers trying to stay ahead of the baddies who , at the last count , had produced some 60,000 viruses
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