The work in [6] describes the importance of real-time collaboration tools for digital ink applications. It tests commercially available peer-to-peer ink-enabled software with penbased interaction tools in a bid to identify the most ecient
features. The hardware used in the study consisted of pen
tablet monitors with separate CPU and peripherals andhybrid" tablets with detachable keyboards: two devices that
require a large amount of desk space and are signicantly
immobile. The main conclusion drawn from this study was
the challenge and importance of facilitating deixis: a ubiquitous technique whereby an idea is demonstrated by speaking
about it and pointing to it simultaneously.