Whenever an HTTP Get or Post does not contain an Interview.Session parameter, the Web Service creates a new interview. Any parameters that are not prefixed with "Interview." or "I." are treated as authentication parameters. For example, the following URL starts a new interview for the demo project and passes the ID field to sample management as an authentication field.

If you supply some, but not all, authentication parameters on the URL, the authentication page will be displayed with those parameters filled in. Additional parameters on the URL, that are not specified as authentication fields for the project, are added to the retrieved sample record as temporary sample fields. When the parameter name matches an existing sample field name, the parameter is discarded and the existing sample field is used.