This paper argues for a joint development of an eye gaze -based, on-line communication aid running on a standard PC with a web -camera. Tracking software is to be provided as open source to allow for improvements and individual integrations with other aids. The interface design shall be defined by the achieved resolution of the tr acking system. The design of a type-to-talk system with 12 large on-screen keys is described in the paper. In order for gaze tracking systems to become widely used, the strive for mouse -pointer precision should be replaced by a focus on the broad potentials of low-resolution gaze-based interactive systems.