GazeTop is a tabletop system that tracks multi-user eye movement in a co-located setting. Knowledge of eye movement is highly relevant to tabletop interaction: eyes can point to distant targets on large tables, address usability issues imposed by rotation sensitive objects, such as menu and text, and facilitate new types of multimodal interactions. This research will evaluate a set of novel eye-controlled interactions and explore the design space of gaze-aware tabletop systems. Keywords Tabletops, Multi-touch, Eye tracking, Gaze-based Interaction. ACM Classification Keywords H.5.2. [Information interfaces and presentation]: User Interfaces.