1. An Integrated Development Environment (IDE), executing computer instructions in a computer-readable storage medium of a computer system, suitable for use in developing a Virtual User Interface (VUI) application, the IDE comprising: a development window for graphically constructing a visual layout of a User Inteface (UI) to correspond to a virtual layout of a Virtual User Interface (VUI); and at least one descriptor that identifies a response of a user interface component in the UI to touchless sensory events applied to a corresponding virtual component in the VUI.