digraph G {
  node [shape=record];
  subgraph cluster_hbf {
    kvm_hbf[label="<kvm>kvm|<1>1|<2>2"];
    fukushima[label="<fukushima>fukushima|<lo>line\nout|<li>line\nin"];
    edge [ color=yellow ];
    fukushima:fukushima -> kvm_hbf:1;
    your_notebook -> kvm_hbf:2;
    kvm_hbf:kvm -> vga_splitter;
    vga_splitter -> LWL_sender;
    LWL_sender -> monitor;
    vga_splitter -> beamer_hbf;
    edge [ color=red ];
    fukushima:lo -> LWL_sender;
    fukushima:lo -> spkr_hbf;
    fukushima:lo -> spkr_hbf;
    your_notebook -> fukushima:li;
    edge [ color=grey ];
    keyb -> kvm_hbf:kvm;
    kvm_hbf:1 -> fukushima:fukushima;
    label = "hbf";
    color = black;
  }
  subgraph cluster_wipp {
    LWL_receiver -> beamer_wipp [color=yellow];
    LWL_receiver -> spkr_wipp [color=red];
    label = "wipp";
    color = black;
  }
  subgraph cluster_kueche {
    label = "kueche";
    color = black;
    spkr_kueche;
  }
  subgraph cluster_legend {
    label = legend;
    color = black;
    l0[label=""];l1[label=""];
    l2[label=""];l3[label=""];
    l4[label=""];l5[label=""];
    l6[label=""];l7[label=""];
    l0 -> l1 [color=red,label="audio" ];
    l2 -> l3 [color=yellow,label="video" ];
    l4 -> l5 [color=orange,label="LWL" ];
    l6 -> l7 [color=grey,label="PS/2" ];
  }
  fukushima:lo -> spkr_kueche [color=red];
  LWL_sender -> LWL_receiver [color=orange];
}