Using the function SysIni to write data to a non-existing ini file creates a file with that name.
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The function SYSINI returns ERROR: if called about 12900 (+/- 100) times in a loop to retrieve/set a value from/in one or more INI files. After the error occurs, you can't use the function SYSINI in that session anymore. To get around this, you have to close the session and open another.
(see also RxIni)