This study aims at investigating the use of systemic theory as a supporting basis for the development of instructional approaches for text production, in particular Internet homepages. The theoretical basis underpinning this discussion is founded on the hallidayan levels of analysis and on the concepts of register and genre as proposed by Eggins (1994). The case-study of two teenagers in their process of re-writing a message sent by a youth network to its members showed that significant changes take place when the computer-based text is structured according to a systemic view.