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ISPVCALL writes information about your environment to its trace data set, including:
• Operating system and product levels • ISPF exits installed • The entire ISPF configuration table • Cached panel names • The history of typed commands • The list of allocated DD names and data sets • Active LIBDEFs • The system SVC table.
Release: Component: DISKOS
Instructions for obtaining SVC26 trace information: 1) Start the ISPVCALL trace by typing "ISPVCALL SVC26" on the command line of the ISPF panel. Following message will appear: "Loading CALL trace. To end, reinvoke this command." 2) Reproduce the problem for which the SVC 26 trace information is needed 3) Stop the ISPVCALL trace by typing "ISPVCALL" on the ISPF command line. Following message will appear: "Unloading CALL trace..." and the data set with the trace will be displayed: "userid.ISPVCALL.TRACE"
For further details on the ISPVCALL trace, see link - http://enterprisesystemsmedia.com/article/ispvcall-ispf-debugging-on-the-bleeding-edge#sr=g&m=o&cp=or&ct=-tmc&st=(opu%20qspwjefe)&ts=1554968642 and the attached pdf-file REXX and ISPF - Troubleshooting