I think responsive reading is probably the least meaningful part of the service. (religion-online.org)
While the Seder's leader takes the group through a series of responsive readings and Hebrew songs such as «Dayenu» (roughly translated as «it would have been enough»), there is often room to improvise or add local elements to the Seder. (religion.blogs.cnn.com)
The Readk.it Manifesto provides a simple example of this, showing how custom CSS and JavaScript can be created as part of the EPUB content and then presented using Readk.it for a rich and responsive reading experience. (readk.it)