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IIS*Studio is a software tool aimed at the information system design and generating executable application prototypes. By means of IIS*Studio, a modeling is performed at the high abstraction level, because a designer creates a system model without specifying any implementation details. Such a model may be classified as a platform independent model (PIM) with respect to the model driven approach to the software development. A goal of this paper is to present PIM concepts and tools embedded into IIS*Studio, that are aimed at specifying business applications. The purpose of such improvements of IIS*Studio is to provide model-to-code transformations, i.e. the development of a code generator for transaction programs and applications that are executed over a database. In the paper we present the IIS*Studio concept named business application, as well as the Business Application Designer tool, by means of a designer can create PIM specifications of business applications. We discuss the expressiveness of new concepts and present Business Application Designer features. We also outline the related concepts concerning visual properties of program forms and functionality of transaction programs.