Some applications (such as CICS and IMS) have terminal tables that predefine eligible terminals and their characteristics. Each terminal that logs on to the application must have the characteristics that the application expects. When this product starts a session with an application, it typically selects the next available virtual terminal. So if a user is logging on from a model 2 terminal, this product can select a virtual terminal that is defined in the CICS TCT as a model 3 terminal, and the result would be session failure or incorrect screen output.
You use the Model Sensitive and Extended Data Stream fields in the Application Characteristics Table to tell the software that an application has predefined terminal definitions. If either of these fields is set to Y, the software selects the virtual terminal based on the model of the user's physical terminal and whether it is queriable or not.
To determine the corresponding logon mode table, the software checks the DLOGMOD parameter on the virtual terminal definition statements in SYS1.VTAMLST. For example, if you define CICS as model sensitive (by specifying Y in the Model Sensitive field in the ACT), and the TCT entry for the virtual terminal TPXGR003 specifies SCRNSIZE=(24,80) and ALTSCRN=(32,80), CA TPX would find this definition for TPXGR003:
TPXGR003 APPL MODETAB=TPXLGMD3,DLOGMOD=T3278M3,...
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