This is a tool to help client-server applications developers. It allows the client development to be started without waiting (from the client side) for the implementation of the services in the business layer. It has been devised specially for developments with xml-based data interchange between client and server. With this tool, the development process starts with an agreement (between front-end and back-end engineers) on the xml objects for interchanging data between layers. Then both development processes (front-end and back-end) can run in parallel, independently of each other. This tool is easy to understand, easy to install and easy to adapt to any project.