Here are some notes for references if you are trying to change the preferences settings in ZOS-API!
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The ZOSAPI.IZOSAPI_Connection.PreferencesFile only works in standalone mode and not in other 3 modes.
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When you didn't specify a PreferenceFile (or when the given path is wrong), all settings in the preferences cannot be changed by API. In other words, only in standalone mode, you can change preferences settings.
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The only way to read a second preferencesFile is to close the current IZOSAPI_Application, change the path, and reconstruct the IZOSAPI_Application. In other words, I cannot read a new PreferenceFile in real time when I’m opening a file via ZOS-API in the standalone application mode.
Best regards,
Michael