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Transcripción del abstract original del autor: The present paper introduces three representative examples in the configuration of mobile field support tools in unfixed field business operations that are extremely difficult to realize, hence called "the final frontier" among the business efficiency approaches that we are promoting at present. The very point here is that we have made a breakthrough in business support that conventionally could not be realized owing to poor handling properties and limited performance of prior PC systems, through the use of advanced mobile devices such as PDA and cellular phone. The mobile tools introduced this time are shown below. They were developed (some still under development) for cell phone and PDA to improve efficiency in the field. * Achieving two types of mobile security for notebook PC and cell phone * Business Java Applications that run on cell phones * e-Book viewer and format for huge documents