This reports the fixed IP address of the other (peer) appliance's HA interface, the counterpart to carMyAddress, and like that object it does not change based on which node is currently active -- it always identifies the same physical peer regardless of role. An admin uses this to know exactly which second appliance is paired with the one they're currently querying, which matters when managing multiple HA pairs across a deployment and needing to confirm the correct pairing. For example, an admin auditing several HA pairs would compare each appliance's carPeerAddress against its actual physical partner to catch any HA pairs that were misconfigured to point at the wrong peer.