Please search before you post. After your search takes you to the Agentry Landing Page and its documentation on extending applications, you will have some insight and probably more questions. Then create your own Discussion instead of hijacking someone else's thread.
More on how to get the most out of SCN is in the Rules of Engagement (see Getting Started link at the top right of each page). There is a lot of other useful content there as well.
Regards, Mike (Moderator)
SAP Technology RIG