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This presentation describes several technical aspects of mobile devices, sensor networks, web technologies, multimedia applications, and context sensitive services in information systems for museums developed at the author's university. Additionally, it will include several ideas and techniques in Green IT. It examines key features of the technologies and the systems, shows multiple methods of using mobile devices, sensor systems and multimedia as well as future research potentials. The development of sensor technology, mobile devices, multimedia and web technologies during the past 25 years has continually affected the creation of new mobile multimedia applications based on emergent technologies. While newly developed device types with different technical specifications have surrounded us in our everyday life and private environment, new base technologies have also been established step-by-step. Industrial standards and paradigms tremendously affect inventions and developments in the mobile sector nowadays, starting in the field of ergonomic hardware design for the mobile market and ending with common patterns for highly effective software engineering and electrical power-efficient hard- and software. By combining the advantages of established technologies with these new approaches and furthermore adapting those criteria to the different user needs and application scenarios, including the special context of the location of the users and the specific environmental conditions, we are able to extend existing applications with new mobile components and services. Moreover, highly innovative concepts can be realised and integrated in a given environment with minimal electrical power consumption.