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About VACnet
Valve Anti-Cheat (VAC) is an automated anti-cheat system developed by Valve and first released with Counter-Strike in 2002 to enforce rules in online multiplayer games distributed through the Steam platform. The system detects unauthorized modifications to a game, including third-party software designed to manipulate gameplay, as well as alterations to core game files such as executable programs and dynamic-link libraries. Modifications that provide an unfair advantage are classified as cheats and are subject to detection by VAC.
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