Desktop notifications have become essential in real-time, event-driven applications, particularly for web services that need to alert users of backend signals or messages. This guide provides a comprehensive tutorial for software engineers and full-stack developers on building a Windows Desktop application using C# and WPF to create desktop push notifications with the MVVM design pattern. The tutorial highlights the use of PubNub's real-time messaging API, which allows for the efficient transmission of real-time signals to various devices. It explains the MVVM architecture, which separates UI and backend development, and provides detailed steps to create a notification app using WPF, C#, and the PubNub API. The guide also addresses how to implement Toast notifications, which are small, unobtrusive popups, and offers solutions for integrating them into WPF applications, despite limited native support. The tutorial encourages developers to utilize available open-source code on GitHub and emphasizes the flexibility and scalability of the system, which can be adapted for custom push notifications to enhance user experience.