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The Complete Guide to CICS Transaction Gateway Volume 1 Configuration and Administration by Richard Mercadante, Manuela Mandelli, Robert Jones, Leigh Compton, Sue Bayliss, Rufus Credle

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Understanding the Gateway daemon
CICS TG is implemented in remote mode when the client application and CICS TG are running on different machines and the Gateway daemon listens on a specific port for incoming client requests. This is also called a 3-tier solution.
In a remote mode configuration, the CICS Transaction Gateway runs a process known as a Gateway daemon, which listens on a specific port, receives requests from remote client applications, forwards those requests to specific CICS servers, and communicates the result back to the remote client ...

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