The agent`s polling frequency. The frequency, in seconds, at which the agent requests information from the device driver. A frequency of zero indicates that the agent retrieves the information upon request of a management station, it does not poll the device driver at a specific interval. If the poll frequency is zero (0) all attempts to write to this object will fail. If the poll frequency is non-zero, setting this value will change the polling frequency of the agent. Setting the poll frequency to zero will always fail, an agent may also choose to fail any request to change the poll frequency to a value that would severely impact system performance.