On Tue, Jul 8, 2008 at 7:38 PM, Shawn Rutledge <shawn.t.rutledge at gmail.com> wrote: > A long time ago I read about a research project along these lines at > Xerox Parc Here we go: http://www.ubiq.com/parctab/ http://www.ubiq.com/parctab/csl9501/node4.html#SECTION00040000000000000000 The 3 buttons were for interacting with a menu. 4 plus thumbs must've been my idea the last time I read that paper.