digraph Pipeline {
        overlap=ortho
        subgraph clusterTerminal {
                label="Terminal texto   "
                style=filled;
                color=lightgrey;
                node [style=filled,fillcolor=white,shape=box];
                Teclado
                Tela
# invisible content to match layout with pipeline:
                edge [style=invis,weight=100]
                node [style=invis,label="",width=0.01,height=0.01]
                Teclado -> prg1pad
                prg1pad -> prg2pad
                prg2pad -> prg3pad
                prg3pad -> Tela
        }

        Teclado -> Programa1 [label="    stdin"]
        Programa1 -> Tela [label="stderr", style="dotted"]
        Programa1 -> Programa2 [weight=10,label="          stdout | stdin"]

        Programa2 -> Tela [label="stderr", style="dotted"]
        Programa2 -> Programa3 [weight=10,label="          stdout | stdin"]

        Programa3 -> Tela [weight=10,label="  stdout"] 
        Programa3 -> Tela [label="stderr", style="dotted"]
}