Virtuoso is an application development workflow consisting of a Core Framework and a content library of components. The Core Framework is designed to accommodate the graphical development of an application, called the “host application”. After the application is designed graphically in the schematic editor, the design gets pushed to the host project, which is written in the language specific to that host, for example C#. Virtuoso handles creating and updating the host application according to the graphical design, essentially taking the graphical drawing and converting it to a corresponding application written in the host language.
Developers can develop their application entirely in the Virtuoso schematic, as may be the case if the developer does not know the underlying host language. Or the developer can just use the schematic as a starting point for an application design, using the convenience of the graphical design and graphical library, and then extend the design with additional custom functionality written in the host language. Subsequent changes to the schematic design can be made and pushed to the host application without affecting the host code you have added yourself.
The figure below shows this general workflow. Virtuoso is used to create a host. Components are graphically added to the schematic editor and configured, with ports connected as necessary. The Core Framework then emits the host code into the project needed to implement the schematic, using the optimum design pattern specific to the host language. For example, for a WPF C#/.NET host, the schematic editor will produce a design implemented with a Model-View-View Model design pattern as a starting point, and the developer can from there add and extend the functionality of the host directly in C# and XAML.