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How to Program a Key Most new keys for modern vehicles need to be programmed before they will function. This can be done at a dealership parts department or a locksmith with the appropriate tools. There are two scenarios in which key programming is required at shops: adding an extra key; or when all keys working are lost. Each of these procedures differs slightly, but can be divided into three categories: Keys In data structures, a key can be an identifier that is unique to an entire set of data. Sometimes the key is part of the data itself (as in primary keys in