"SUI" stands for "stacked user inputs", which is the premise of the TRKBRD design. The trackpad and keyboard are stacked to create a TRKBRD input device.

"Stacked user inputs" is the subject of my Masters Thesis at Malmö University in Sweden. All research, prototypes, and progress will be documented on the stackedui.com site.

Follow the progress with the @stackedui twitter feed too! Each post from the blog will also be tweeted, for the quickest notifications and statuses!