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With HATS, you can create Web applications and rich client applications that provide an easy-to-use graphical user interface (GUI) for your 3270 applications running on IBM® System z® platforms and your 5250 applications running on IBM i operating system platforms. HATS applications can access 5250 applications without requiring Online Transaction Processing (OLTP) capacity. In this book, these character-based 3270 and 5250 applications are referred to as host applications. You can also create service-oriented architecture (SOA) assets using Web services that provide standard programming interfaces to business logic and transactions contained within host applications. Data from video terminal (VT) emulation screens can also be accessed.