This week's book giveaway is in the OCMJEA forum. We're giving away four copies of OCM Java EE 6 Enterprise Architect Exam Guide and have Paul Allen & Joseph Bambara on-line! See this thread for details.
Home interfaece, as the name indicates is the home, from where you get references to the component interface. The home has the create methods that clients can call to obtain a reference to the component instance. The component interface is what has the business methods you are interested in. It is the actual thing that you are likely interested in. Hope this helps.