Cache coherency is maintained between the dedicated caches of a chip multiprocessor by writing back data from one dedicated cache to another without routing the data off-chip. An insulating plate and an insulating material layer are provided under the heating element inside the underbody of the jug. In an other embodiment, the tubes of the cooling armature are embedded in a sealing material, resulting in a plate being placed either against the lower surface of the dry-process manufactured upper plates or against segments of this surface. The invention includes an interface for manipulating images by using a graphical user interface in conjunction with an operating system. The light guided in this light guide is modulated by electromagnetic fields emitted by a movable probe.