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All interface modules' objects inherit the TCntrNode node class, which provides the control interface mechanism, one of whose functions is to provide the configuration interface of the object in any OpenSCADA configurator. To solve the new module's tasks it may be necessary to expand the parameters of the configuration; it is made in the void cntrCmdProc(XMLNode *opt); virtual function. The contents of this function that adds a property in the simplest case has the following form: