An Xorg Xvfb server, the real X.Org twm window manager, and X11 apps — all WebAssembly, each app/WM in its own Web Worker, talking X to the server over WebSockets. twm gives draggable title bars and a button-1 root menu. Start and kill apps below — or launch separate windows to drive this same kind of server from another window (or another browser entirely) over the wire.