This chapter explores questions about the software, the interface system for Internet applications, GWT in the context of the development of complex Internet applications based on AJAX technology. In addition, work briefly shows web applications—the interface available from the web browser level. At the same time, it points to the Nielsen heuristics interaction, which represents the user-friendly and ergonomic interface of any application. Then, the publication attempts to explain a business strategy called PLM on the example of PTC Windchill. As the next are gathered and discussed the possibilities of the windchill platform. The work shows how to develop own application that has been integrated into PTC Windchill. In addition, GWT and other related technologies have been presented.