The core business in an enterprise are still the transactions that run day by day to make the businesses happen. The evolution of the last years showed once more the necessity of standard and modern interfaces, for the integration of transactions to distributed transactions across different platforms. Today's most standard interface is the web browser technology. For the core applications running on z/VSE, technology was developed to allow existing programs to interact via browser.
Based on the reliability, feasibility and security of the transactions running with CICS Transaction Server (CICS TS) in z/VSE, IBM developed new functions to enable the integration of existing core transactions into web processes using internet standards and web technologies.
To have access to z/VSE transactions via browser technologies, a 2-tier solution is available as function within the CICS Transaction Server and 3-tier solutions are available using middleware products.
The CICS Web Support (CWS) allows to access your CICS applications directly with a browser, without a middle tier. CICS Web Support (CWS) is a feature of CICS Transaction Server . It allows to access your CICS applications directly with a browser, without a middle tier. The 3270 to HTML transformation is done on the z/VSE system by CWS based templates.
Products like IBM Host Access Transformation Services (HATS) and IBM Host On-Demand (HOD) allows to access your z/VSE system using Telnet 3270 (TN3270) and web applications. IBM Host Access Transformation Services (HATS) and IBM Host On-Demand (HOD) are servers, that run on a middle tier system. They are responsible for transforming the 3270 screens into HTML pages that can be displayed by a web browser. Access to the z/VSE system is done via Telnet 3270 (TN3270). All you need on z/VSE is either a Telnet Daemon on z/VSE or on VM. The HATS Studio is delivered with HATS and allows development of web based applications which interact in the background with existing z/VSE applications without changes to these applications.
Additional information for this solution scenario can be found: