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Designing and Programming CICS Applications by Members of the CICS Development Team at IBM Hursley, John Horswill

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Communicating with CICS

In order to communicate with a CICS application on a CICS server machine, you need have an IBM CICS Universal Client on your workstation, and to establish a connection from this client to the CICS server. In the sample application, we use TCP/IP to connect from our CICS client to our CICS for OS/390 server. However, our CICS for OS/390 server makes use of an LU6.2 protocol. Therefore, there is a mismatch between our workstation using TCP/IP and the server’s SNA LU6.2 protocol. This requires a translator of some sort to be used to allow the client and server to communicate. Fortunately CICS can handle the necessary translation using the TCP62 driver.

Tip

There are two ways to connect your CICS Universal Client to CICS TS on OS/390. You can use TCP62, which we are going to describe, or SNA. Talk to your local SNA specialist if your site uses this connection method.

A Digression About TCP62

TCP62 enables a CICS Universal Client to use TCP/IP to access a CICS Transaction Server. This access is achieved using a product called AnyNet. It is a part of ACF/VTAM for OS/390. On the client workstation, the AnyNet component is provided by IBM Personal Communications for Windows NT, Windows 98, and IBM Personal Communications for OS/2. Don’t worry if you think that you don’t have this because a cut-down version is shipped with the CICS Universal Client. When you install the latter, just make sure that you select the TCP62 checkbox in the installation wizard. This is how TCP62 ...

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