A system, method, and program product for scheduling processes of a workload on a plurality of hardware threads configured in a plurality of processing elements of a multithreading parallel computing system for processing thereby. The tube has a front opening, a rear opening, a side opening and a rear bracket. Subsequently, the corresponding help file can be located in a fixed storage location referenced by associating the help file name with the base address. Each of the LED strings has respective terminal connected to a common terminal which is a direct current output terminal of the rectification power supply, the other terminal of the LED string is connected to the respective switch device. This allows a selective purge on only a head which requires a purge.