HT-2021-000363 - [2025] EWHC 532 (TCC)

CICS includes features used by user application programs to present screens to, and obtain information from, a 3270 user. A 3270 terminal user has several attention keys, each one identified by a number, or ‘AID’. CICS provides features for user programs to identify the attention key pressed and determine processing depending on the key used. As for the DFHMBSA copybook above, CICS provides a resource that can be used by user programs written in languages such as Assembler, COBOL, C and PL/I, source code for each programming language that assigns a variable to each number.

LzLabs created a COBOL program that attempted to dump all the DFHAID copybook fields and attached it to DR 753 dated 20 August 2021, requesting Winsopia to provide and/or verify the numeric values for the DFHAID copybook constants.

Winsopia compiled and executed the program and, on 23 August 2021, Mr Lynch sent the test results back to Mr Joot of LzLabs. This did not include the compiler listings or scrubbed modules.

Initial implementation of the SDM version of DFHAID was created by LzLabs in March 2019. Following the response to DR 753, Mr Joot updated the SDM file, by correcting and/or adding the copybook constant values supplied by Winsopia. Mr Joot identified DR 753 as the source of the constant values.