Today access to computing power and communication has become nearly ubiquitous. Mobile computers and even mobile phones have computing power, storage and graphics capabilities comparable to PCs from a few years ago. With the advent of GPRS, UMTS, WLAN and other networking technologies high speed Internet access is possible nearly anywhere. At the same time an enormous amount of permanently updated information has become available online. In fact one can say that for nearly any situation there is guaranteed to be a piece of useful information somewhere on the network. This includes such trivial everyday things like restaurant menus and transportation delays but also information relevant to a variety of professional applications. The latter include building plans (relevant for rescue personnel), patient record (needed for example by emergency medics) and multimedia manuals (for maintenance and assembly work).
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