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Steam automates the process of downloading the content and keeping it up to date for the user. All patches are downloaded as soon as they become available through Steam, though often they become available later than those for the retail versions, and if there are multiple versions (e.g. a 64-bit edition), the correct one will be chosen automatically based on the computer's hardware and/or software environment. This process happens every time the user logs in, or a game is launched, ensuring that as many users as possible will have the latest software. Once a patch has been applied, it cannot be removed unless Valve issues a new update to reverse the previous patch. While there is no option to globally disable automatic updates, it is possible to set a specific game to only update when requested by the user. Steam requires that games be fully patched before they can be played, however.