The following ActorDefinitions define the systems that plays a role in data exchange, and that have obligations associated with the role the actor plays, in AU Core.

- [AU Core Requester actor](ActorDefinition-au-core-actor-requester.html)

The AU Core Requester is a system that creates and initiates a data access request to retrieve core digital health and administrative information. The set of capabilities (behaviours) for this actor is defined in [AU Core Requester CapabilityStatement](CapabilityStatement-au-core-requester.html).

- [AU Core Responder actor](ActorDefinition-au-core-actor-responder.html)

The AU Core Responder is a system responsible for providing responses to queries submitted by AU Core Requesters. The set of capabilities (behaviours) for this actor is defined in [AU Core Responder CapabilityStatement](CapabilityStatement-au-core-responder.html).