One of the mechanisms used by anti-malware applications is to institute a virtual 'sandbox' to isolate suspicious files from the rest of the system while they are quickly analysed for malicious content or behavior. Creating a sandbox requires the anti-malware software to essentially institute a Virtual Machine - a computer that is completely implemented in software. A lot of current sandboxes are designed to emulate network connections and normal system behavior in an effort to trap malicious output from a suspicious file or application.
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