Double-click an icon, or select it and press Enter. Drag a title bar to move a window; drag its bottom-right corner to resize. The small boxes close, minimize and zoom it.
Window titles and resize handles also accept arrow keys. Ctrl + ` switches windows. Programs in the background are paused.
Window positions are remembered. Closing a game ends that session. Glen, Tidewatch, Updraft and Monochrome Mêlée require WebGPU.