
Interaction techniques for virtual behavioural primitives 287
Figure 12.30 Sensboard
®
virtual keyboard system with pressure sensors, Sensboard Technologies AB
most used nowadays to write mails or to type out a report on the computer. However,
using a manuscript can also help in entering symbols on the computer-based tool.
One of the first uses was made on Palm. In fact, on PDAs, the idea was to provide a
handheld computer without a keyboard, but through which you can still write text or
other symbols. It is sufficient to use a stylus on a tactile screen by writing the letters of
a simplified alphabet (Graffiti 2 alphabet).
Other techniques were proposed, ...