The following describes components of Amazon SimpleDB operations.
Subscriber—Any application, script, or software making a call to the Amazon SimpleDB service.
The AWS Access Key ID uniquely identifies each subscriber for billing and metering purposes.
Amazon SimpleDB Request—A single web service API call and its associated data that the subscriber sends to the Amazon SimpleDB service to perform one or more operations.
Amazon SimpleDB Response—The response and any results returned from the Amazon SimpleDB service to the subscriber after processing the request.
The AWS Platform handles authentication success and failure; failed requests are not sent to the Amazon SimpleDB service.