Multiple Input Support in a Model-Based Interaction Framework

Developing for tabletops puts special requirements on interface programming frameworks: managing parallel input, device discovery, device equivalence, and describing combined interactions. We analyse these issues and describe the solutions that were used in IntuiKit, a model- based framework aimed at making the design and development of post-WIMP user interfaces more accessible. Some solutions are simple consequences of the support of multi- modality, while others are more specific to multiple touch. We illustrate these features through examples developed in several tabletop projects, including one application aimed at improving collaboration between air traffic controllers.