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Note that f90VB procedures PropertyGet, PropertyPut, PropertySet and ExecMethod take care of ordering arguments of ActiveX functions so they are called in a natural way from your Fortran applications. We could have done the same for the arguments passed to Fortran event handler functions, but that would have resulted in a noticeable degradation in the performance of your application’s event handling. Some events are fired many times in the course of a normal application, and argument re-ordering would have to be done each time the event was fired.