Methods, apparatus, and articles of manufacture control a device or system that has an operational limit related to the rate or frequency of operation. When it is determined in step S2 that a request for sending a list of musical pieces has been received, the list of musical pieces is sent in step S3. The track width is equal to or smaller than a width produced by subtracting twice an off-track width of the magnetic head with respect to the data recording tracks during a reproduction of the recording data from a magnetic effective reproduction head width of the magnetic head. Unique names of files enable simultaneous operation of two versions of a device driver. It further relates to a system for processing multilayer bodies with such a multilayer body arrangement, as well as a method for processing multilayer bodies, wherein the multilayer bodies are disposed such that the respective surfaces to be processed are opposite each other and thus form a quasi-closed processing space disposed between the surfaces, in which the processing occurs. Speculatively accessed entries of a cache memory are marked as speculative, which may be on a thread specific basis.