Hilariously, this is basically the pattern everyone figured out long ago with Windows Forms apps. Model View Presenter with decoupled events that are fired off

Hilariously, this is basically the pattern everyone figured out long ago with Windows Forms apps. Model View Presenter with decoupled events that are fired off to any subscribed listeners. Multiple screens and models can be updated as needed. Very easy to do in a C# app thanks to uncluttered syntax for events. Go check out the "Microsoft Patterns and Practices" frameworks from decades ago to see many examples of this.