AI Engineer World's Fair 2026 — unofficial import demo

Computer-use agents still inherit a basic desktop limitation: one machine has one foreground app, one hardware cursor, and one active actor. Once you try to run more than one agent per desktop, they start stealing focus from the user and from each other. We built cua-driver around a different model: multiple agents operating real desktop applications in parallel, each with its own synthetic pointer, while the user's cursor and keyboard stay undisturbed. The key move is to stop treating hardware mouse and keyboard events as the primary automation layer. cua-driver goes one layer lower, into the OS plumbing behind accessibility: UI Automation on Windows, AT-SPI on Linux, and AX on macOS. Those APIs address applications and elements directly, so the OS does not require the target window to be frontmost. A click can land on a background window. A keystroke can reach a hidden one. Multiple agents can act at once because none of them is competing for the singleton hardware mouse. I'll walk through the architecture, the API shape, and the platform-specific traps we hit while making it work across Windows, macOS, and Linux. The live demo is three agents operating on one desktop while the user keeps typing uninterrupted. The goal is to make Computer-Use 2.0 feel concrete: what changes in the stack, what becomes possible, and where the approach still leaks, including Wayland, Chromium DOM surfaces, native canvas apps, and fallback input paths.