A system for developing rich internet applications (RIAs) for remote computing devices that utilize a certifying player to invoke server-side web services through a single, secure, certifying intermediary server, includes an integrated development environment (IDE). The IDE includes a toolbox comprising graphical components configured to be dragged and dropped into UI states implementing the RIA process flow and a Web Service Description Language (WSDL) integrator for generating web service call for accessing web services for processing input from the UI states and generating an output result.