systemConfig command allows write and read access to the system configuration which the Content Manager and the Template Engine read from their initialization files when they are executed. Changes to the system configuration only affect the running application. The initialization file concerned will not be updated during this process. Therefore, changes you want to be permanent need to be made to the corresponding initialization file.
Data to be stored in the system configuration with the
systemConfig command need to exist in the XML format. In versions prior to 5.0, CMS Fiona used the property list format instead.