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A key is an instrument that is used to operate a lock. A key is usually intended to operate one specific lock or a small number of locks that are keyed alike, so each lock requires a unique key. The key serves as a security token for access to the locked area; only persons having the correct key can open the lock and gain access.

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Is there a reason keyless ignition cars do not shut off when it can no longer detect the key...

An important point to understand is that car manufacturers consider the electronic code transmitted from the key-fob to the starting system the digital equivalent of a physical key, so the "removal" of … This would pretty much defeat the "key-less" point, as the best way to "lock" the key-fob in the car while it's running would be to just have a key on it and use a traditional key-based ignition. …
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