@c** FXIME: See comment above.
@c** See figure ~\ref{fig:interaction} for an illustration of this approach.
+@c ** @image{filename[, width[, height[, alttext[, extension]]]]}
+
+@image{images/gnunet-tutorial-service,,5in,Service with API and network protocol,.png}
+
+@image{images/gnunet-tutorial-system,,5in,The layered system architecture of GNUnet,.png}
+
@c \begin{figure}[!h]
@c \begin{center}
@c % \begin{subfigure}