The "hot" factor heavily relies on AI. In these simulators, an AI assistant (often named "Cortana 2.0" or "Windows Copilot X") lives in the top-right corner. Clicking it doesn't just open a search bar—it opens a holographic chat interface that "pretends" to control your PC. You can type "Open Neon Notepad," and the simulator will animate a fake app opening.
It sounds like you're referring to the recent wave of "Windows 13 Simulator" or "Windows 13 Concept" videos and apps that have appeared online. Since Microsoft has officially stated that (though they later released Windows 11, skipping 10X), there is no official Windows 13. windows 13 simulator hot