Unlike most other applications, CICS does not use the VTAM-supplied description of a terminal when a user initiates a session. Instead, CICS uses a special module called the Terminal Control Table (TCT) to determine terminal characteristics. You provide the description for each terminal that a user may use to initiate a CICS session. This restricts the freedom of the remote operator to move terminals around on the 3x74 controller.
When the terminal logs on to CICS, it must have the characteristics that CICS expects it to have based on the TCT entry for the terminal. When this product starts a session with an application, it normally selects the next available virtual terminal. Therefore, if a user is logging on from a model 2 terminal, the product may select a virtual terminal that is defined in the CICS TCT as a model 3 terminal. The result would be session failure or incorrect screen output.
Each TYPETERM definition must be installed before or at the same time as the TERMINAL definitions that reference it. When using CEDA to install groups, if the TYPETERMs are in a separate group from the TERMINALs, the TYPETERMs group must be installed before the TERMINALs. Changing a TYPETERM definition and then reinstalling it has no effect on an already installed terminal entry, even though the TERMINAL definition used to create it refers to the TYPETERM. To change the terminal entry, both the TYPETERM and the TERMINAL need to be reinstalled.
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