An Arbortext PE Anwendung is a program written in Arbortext Command Language (ACL), Java, JavaScript, or VBScript that runs in an Arbortext PE Unterprozess. The Arbortext PE Request Manager invokes an Arbortext PE Unterprozess to run an Arbortext PE Anwendung when it receives a request with HTTP query parameters specifying the application language and a function or class name. The Arbortext PE Request Manager passes the entire HTTP request to the Arbortext PE Anwendung. The application is responsible for constructing a complete HTTP response and returning the response to the Arbortext PE Request Manager which returns it to the HTTP client.