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A Secondary Key is specifically designed to operate certain vehicle locks but does not have the capability to operate the ignition lock. This distinction is important in locksmithing and automotive functions, as different keys serve different purposes and levels of access within a vehicle's locking system.

The Secondary Key often allows for limited access, such as the ability to unlock the doors or the trunk without having full control over the vehicle's ignition system. This separation is critical for security reasons, as it prevents unauthorized use of the vehicle while still allowing for necessary access, such as entry to the vehicle when the primary key is unavailable.

In contrast, the other choices pertain to different functions, such as operating the ignition lock, being solely for emergencies, or having access to all locks, none of which accurately define the specific use of a Secondary Key.