The PDFreactor GUI Demo application, which is installed on your machine through the PDFreactor installers, is for testing and demonstration purposes only. It allows you to easily and quickly experience PDFreactor's XML and XHTML/HTML printing capabilities.The GUI Demo application offers a browser like WYSIWYG view as well as a single and double page PDF preview. You can create each PDF document on-the-fly and save it to your computer. The document's source code and inline style sheets (used in some of the sample documents) can be modified in order to experience the styling-based processing model of CSS. Style sheets and advanced properties of all documents are exposed in separate views as well.