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How to Program a Key The majority of new keys for modern cars have to be programmed to work. This can be accomplished at a dealer's parts department or by a locksmith who has the right tools. Key programming is required in two situations in which an additional key is added, or when all working keys are lost. Each of these steps is different however, they can be broken down into three categories: Keys In data structures keys are a value which uniquely identifies an entire set of data. The key may be part of the data (as as