Drawing is a basic mode of human communication. This paper describes a tool, written in Java, that is designed to support the capture and analysis of interactive graphical communication for experimental purposes. It is based around a simple 'virtual' whiteboard that supports remote and co-present graphical interaction between pairs 3f subjects. Logs of the subjects' drawing activity and the dynamics of the communicative exchange are captured for subsequent statistical analysis. The software supports experimental manipulation of graphical interaction by providing control over update and layout of the whiteboard area. It also supports manipulation of patterns of group interaction through the management of multiple simultaneous shared whiteboard connections. Lastly, a playback tool supports fine-grained analysis of collaborative drawing activity.
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