IMS Index Builder output and control flowEdit online This section describes the IMS Index Builder output file and control flow events. IMS Index Builder output filesIMS Index Builder has a main output file and, depending on the type of processing, up to three additional output files.Control flow events reported on IIUSNAPIMS Index Builder records major processing events. You can monitor the progress of processing so that you are aware of the type of processing that IMS Index Builder has selected. In some cases, information about processing events can be used to perform diagnostic functions.Parent topic: Troubleshooting