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+Online help can be provided on different ways:
+\begin{itemize}
+\item \textsc{pdf} annotations\\
+Annotations are represented using icons. If the user moves the mouse
+over an annotation icon, the annotation text is shown in a tooltip. If the
+user double-clicks the annotation, the note is shown on the screen.\\
+Advantage: Annotations do not need JavaScript.\\
+Disadvantage: Place is needed for the icons.
+\item tooltips\\
+Tooltip text is shown if the user moves the mouse over a form field.
+Most users know the concept of tooltips from other applications.\\
+Tooltip text can not (yet?\footnote{2008-02-07}) be set using
+hyperrefs form field options, so we use JavaScript instructions
+to set up tooltips.
+\end{itemize}