myBook might be the lightest portable Mac ever. Small, light and semi-rugged, It roots deeply in Alan Kay Dynabook There are two keys on the screen, readable from both side (for left or right-handed).
One is used to emulate the left-click and displays a contextual menu.
The other one, the toolkey button, is especially intended for mybook and displays a toolbar which change according to the context.
For example it brings a type-in area when the cursor is in text mode.