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The tool that is specifically designed to actuate a dogging device in an exit assembly is known as the dogging key. This key is essential in the locking mechanism of devices such as panic bars or exit devices, allowing the user to hold the door in an unlocked or open position. This is particularly useful in high-traffic areas where easy and quick access is necessary, enhancing safety and convenience.

The dogging device provides a means to secure the exit door in an open position, allowing individuals to pass through without needing to physically push or pull the door each time. The use of the dogging key simplifies this process, indicating its exclusive role in this context. Other tools mentioned would not serve this specific function and are typically used for different types of locking mechanisms or access scenarios.