The Interview parameters used directly by the Web Service are as follows:

The properties that might typically be used as part of the HTTP Get or Post are as follows:

For example, the following URL starts a test interview for the demo project:

When an HTTP Get or Post contains an Interview.Session parameter, the Web Service passes the entire HTTP Post string to the HTML player specified in the Renderer parameter. If the Renderer parameter is not specified, the default HTML player, HTMLPlayer, is used. All parameters not prefixed by "Interview." or "I." are assumed to interview response parameters that refer to the current question. This behavior allows branching out of an interview to perform some action such as playing a video clip, and then returning to the interview at the same page as before.

The interview parameters required in an interview response are: Engine, Session, Project, and Renderer. However, the Renderer parameter is not required for the default HTML player.

See Project and interview properties: Reference for further information about all properties mentioned in this topic.