Final answer:
An agent must notify the appropriate commissioner, such as a DMV for voter registration, when they change address; if within the same county, an update is needed, but if moving to a new county or not registered, a new voter registration must be filed.
Step-by-step explanation:
When an agent is required to notify the Commissioner of a change of address, it is typically in context with certain legal or administrative procedures. For instance, when discussing voter registration, if an individual has moved to a new address, they need to inform the appropriate authorities to update their records. According to the available information, in California, if an individual has moved and still resides within the same county, they can simply update their address to reflect the change in voter records. However, if they have moved to a new county or are not registered to vote in their current county, a new voter registration card must be completed.
This can often be done through the Department of Motor Vehicles (DMV), by submitting a DMV Change of Address form to the indicated address, contacting them by phone, or logging onto the Secretary of State's website.