+You can include script files in other script files,
+like in the following example :
+
+
+\begin{verbatim}
+# Defines the Add4 black box which adds 4 doubles
+include Add3
+define Add4
+ author "myself"
+ description "adds 4 doubles"
+ new Add3 a
+ new Add b
+ connect a.Out b.In1
+ input In1 a.In1 "first double to add"
+ input In2 a.In2 "second double to add"
+ input In3 a.In3 "third double to add"
+ input In4 b.In2 "fourth double to add"
+ output Out b.Out "output"
+endefine
+\end{verbatim}
+
+The inner boxes have they own entries (In1, In2, In3 for box a, In1, In2 for box b )\\
+Only the inputs In1, In2, In3 of box a and the input In2 of box b is of interest for the end user, but he dosn't want to have to
+care neither about the inner boxes name, nor about the names of their Inputs.\\
+The writer of the complex box has the ability to give these inputs a meaningfull name !
+\begin{verbatim}
+ input In3 a.In3 "third double to add"
+ input In4 b.In2 "fourth double to add"
+\end{verbatim}
+