We wish to thank the many summer interns that have contributed to this project and made it fun to work on: Michael Tso, Nina Bhatti, Angie Hinrichs, David Maltz, Maria Okasaki, and George Fitzmaurice. We also wish to thank: Jennifer Collins and Sonos Models for facilitating the PARCTAB packaging; Bill Buxton (UT) for his advice concerning UI design; Terri Watson, Berry Kercheval and Ron Frederick for developing novel applications; Natalie Jeremijenko for collecting and processing results from the tab usage experiment; Olivetti Research Ltd (ORL) and Andy Hopper for collaborating with us while developing the communication hardware; Brian Bershad (UW), Craig Mudge(Flinders) and Mike Flynn for their keen advice and collaboration. Finally, we wish to thank and acknowledge Mik Lamming for his original contributions and support during the lifetime of the project.