Abstract: A commercial activity can be marketed using distributed computing. Processor-executable code is sent to a plurality of users. The users are requested to run the processor-executable code on network-coupled computing arrangements accessible by the users. A distributed computing task is performed on each of the computing arrangements by running the processor-executable code on the computing arrangements. The distributed computing tasks work in concert to solve a computational problem. As a result of the distributed computing task, a user-perceivable experience is provided via the computing arrangements. The user-perceivable experience is configured for purposes of marketing the commercial activity.

Abstract: The invention relates to a method and arrangement for generating a virtual keyboard in connection with an electronic apparatus (10) on a planar surface (16). The virtual keyboard is drawn by a laser transmitter (11), and the light reflected from an obstacle (15b) in the area of the virtual keyboard is received. The angle of incidence and time of arrival of the received signal are observed, and on the basis thereof a conclusion is drawn about whether a certain key in the virtual keyboard has been pressed.

Abstract: A memory-card device for transferring information between the memory-card slot (27) of an application device (25) and a wireless terminal device (24), in which the memory-card device (10) is fitted to the memory-card slot (27) by means of connecting devices (16) and to which at least memory devices (11, 14) are fitted for storing information. The memory-card device (10) is arranged in the memory-card slot (27) essentially to simultaneously emulate a memory card and transfer information between the application device (25) and the wireless terminal device (24) connected to a data network (23) and that the memory devices (11) are dimensioned according to the information storage unit of the application device (25).

Abstract: The invention relates to a method and arrangement for generating a virtual keyboard in connection with an electronic apparatus (10) on a planar surface (16). The virtual keyboard is drawn by a laser transmitter (11), and the light reflected from an obstacle (15b) in the area of the virtual keyboard is received. The angle of incidence and time of arrival of the received signal are observed, and on the basis thereof a conclusion is drawn about whether a certain key in the virtual keyboard has been pressed.