wtf is realtime-playground?

The Google Drive Realtime API Playground is a web app that lets you experiment with Google's Realtime API, a tool that enables collaborative features in applications, think multiple people editing the same document simultaneously. Rather than reading documentation abstractly, you can try the API's features directly in a browser and see how they work. The playground walks you through the steps needed to get the Realtime API running in your own application. It also serves as a reference implementation, meaning you can look at how it's built to understand how to integrate similar collaboration features into your own project. There's a live version you can try without installing anything, or you can host it yourself. Developers building collaborative apps would find this useful. For example, if you're creating a tool where multiple users need to edit shared content in real time, like a collaborative text editor, a shared whiteboard, or a multiplayer planning tool, this project shows you how that works with Google Drive's infrastructure underneath. To run your own instance, you need to set up a Google API project, enable the Drive API, and get specific credentials. The project can run on any basic web server, and it includes configuration files for hosting on Google's App Engine platform. You'll need to plug your own application credentials into the code before deploying.