My first exposure to this was at the UIST conference in 2007, I've seen it pop up at a couple of other HCI conferences since then and I've always been skeptical

My first exposure to this was at the UIST conference in 2007, I've seen it pop up at a couple of other HCI conferences since then and I've always been skeptical of this interaction paradigm ever since I first encountered it. Every time I meet someone working on this project, I ask them several hard questions which I've never managed to get satisfactory answers to: * How is cross screen, pen interaction handled in a graceful & generalizable manner? How do you distinguish dragging to the edge of the first screen vs dragging onto the second * What is the persistence model between the two screens in independant mode? Do they share state or not? * Is this designed for specific, highly targeted applications or as a platform? If it's a platform, how do you intend to replicate the interaction paradigms of desktop apps such that they can either be trivially ported or completely rewritten? My ultimate conclusion about this project has always been that it's been optimized to get papers into HCI conferences and not towards practical use.