A device for treating a disc-like article with a fluid, including elements for dispensing a fluid onto the article and a chuck for holding and rotating the article around an axis perpendicular thereto, the chuck including a base body, a drive ring, and gripping members for contacting the article at its edge. The pseudo-random mechanical motion of the body is transmitted by the member to a free end of the member. The gate insulating layer is formed over the substrate to cover the gate. The concurrency primitives could represent objects, and the processors may be capable of using the objects by reading from andor writing to addresses in an address space associated with the concurrency engine. Under user control, the user may select the time of the forecast weather conditions shown in the graphical portion of the presentation.