A system for generating, on a users terminal, a graphical user interface comprising at least one interface item. A user creates a graphical user interface for an application by using a designer module to drag and drop interface items on a window and by associating properties, events and actions to the interface items. The designer module then generates a set of data corresponding to the interface item using I3ML, a programming language that employs the syntax of XML. The set of data is stored in a file, such as in a server, and then is transmitted to and processed by a player module. The player module receives the set of data and uses it to display the graphical user interface. Each interface item of the user interface has a corresponding set of I3ML data which the player module employs to display it. Upon a user interacting with the interface item, the system is configured to perform an action associated with the interface item, without performing any other action corresponding to the user interface.