Related terms
An interchange is one round-trip pair of messages between two systems that are related through an automated interface, one request and one response.
For a PRPC connector, the PRPC engine can be viewed as the client or initiator of a request made to another system that has the role of server. The server's response completes the interchange.
For a PRPC service, an external client system initiates the request to PRPC, which executes an activity and replies with a response.