The following section describes the different implementation scenarios for the SAP Java Connector. The SAP JCo is generally used in two different ways: As an integrated component of an SAP technology component, or as a standalone tool that you can use to connect an external Java application to the ABAP environment of an SAP server.
J2EE/ABAP Coupling in the Application Server (integrated standard scenario)
SAP JCo Scenario in SAP Business Connector (integrated standard scenario)
Displaying Invoices from the SAP System in the Web Browser (standalone scenario)