Multiple input support in the IntuiKit framework

IntuiKit is a programming framework aimed at making the design and development of post-WIMP user interfaces more accessible. Developing for tabletops puts special re- quirements on such a framework: managing parallel in- put, device discovery, device equivalence, and the descrip - tion of combined interactions. We describe how the model- based architecture of IntuiKit supports these, either thro ugh features that are native to IntuiKit, or through extensions for managing multiple input. We illustrate these features through examples developed in several tabletop projects, i n- cluding one application aimed at improving collaboration between air traffic controllers.