In the blog post dated September 9, 2019, author Jake Priddy discusses the integration of the Agora Video SDK for Unity3D to enable cross-platform communication across Windows, Mac, Android, and iOS. The guide details the process of setting up a sample Windows application in Unity, starting with the creation of a new project and downloading the Agora Video SDK from the Unity Store. Key steps include updating the code with a unique App ID from an Agora developer account and configuring plugin identities for different platforms to avoid collision errors. Priddy explains how to adjust the Build Settings and Player Settings to ensure compatibility with Windows, highlighting the importance of organizing builds into separate folders for future use on other platforms. The post also references additional resources for API documentation and technical support through the Agora Dashboard and Developer Relations team.