Embodiments of the invention allow the operation of confocal microscopes with relatively open pinholes whilst still giving a significant XY resolution improvement. A computer memory system provides for the ability to removably connect one or more of such cards with a common controller circuit that interfaces between the memory cards and a standard computer system bus. The method includes making available at the simplified computing platform one or more normalised content items received from a data handling server. A program command and access control data including a new access code are transmitted wirelessly from a hand-held program unit or the like. An interference is formed between a cold working tool and the metal layers results in a radial force that is applied only to the metal layers.