The reader is able to interact because a hypertext document can contain not only text and pictures, like traditional documents, but also sound bites, graphics and video pieces. This can allow for multiple perspectives. Maybe the reader learns or understands better through visual or audible techniques. Hypertext permits that person to be able to get a broader context from that document then a document written in traditional form. This could also let a person use a link or node to get to a graphic or another document that could help with comprehending the information in the document.
Active participation is needed in order to get the most out of the hypertext documents.
The reader interacts with the document by clicking to a new section. This is helpful when doing a reading from Eager Allen Poe. Readers of today may not understand the reason behind the way of writing that he uses, but with hypertext you can click on a link or node and be able to go to his bibliography. Here you can get the background information needed to help understand the readings. With Rap music, the listeners can not really interact with the song.