Existing window systems have been designed to support a single user and they are not suitable for control room collaboration. This paper describes how to extend the X-window system to support multiple simultaneous cursors. In a collaborative control room environment a multi-cursor X window system can allow multiple users to simultaneously drag, control and input to windows on a shared display. This paper discusses the design and implementation of a multi-cursor X window manager. Our early experience at a fusion control room show that our multi-cursor X window manager is an eŽective approach to support control room collabora- tion.