XI is designed to provide Web services that are commonly used for asynchronous, system-to-system communication....
JCo allows your Web application to communicate synchronously with an SAP program via RFC or BAPI interface. This guarantees that your users will have the best possible response time and allow them to quickly edit and submit requests to SAP. Conversely, if you have a great deal of custom ABAP or need to develop custom ABAP to communicate directly with specific SAP functions, Business Server Pages (BSP) allow you to create Web applications with ABAP and HTML.
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