These service pr imitives are located between the service providers and the service user in the service model. The Response primitive is used by the service user to acknowledge a previously received indication of service. Other service primitives include request, indication, and confirmation.
The Response is the response to a Request, where a service user asks the service provider for a specific service. The service provider, for example a web server, sends the desired document, for example a web page, to the service user, the browser, with the response.