GUPU's screen consists of two windows. The left contains the
examples to be solved. The right contains help (read-only) texts with
links to other texts like so: \Hinweis{init}. All interaction
is performed through these two windows.
GUPU's metaphor is very simple: The left window is like a
paper sheet containing at first only example statements. The student
adds more text and saves it from time to time by pressing the ![[DO]](DO.gif)
button.
Comments from the system or lecturer are written back into
the text after pressing .
Now let's zoom into the 2nd example.