digraph G {
	ratio = 1.3;
	subgraph cluster_core {
		label="PyLink Application Structure";
		style="filled";
		node [style="filled",color="white"];
		color="lightblue";
		subgraph cluster_testsuite {
			label="Test Suite API";
			style="filled";
			node [style="filled",color="white"];
			color=moccasin;
			"Dummy protocol\nmodule" -> "Dummy IRC\nobject (FakeIRC)" [color=darkgreen];
			"Dummy IRC\nobject (FakeIRC)" -> "Dummy protocol\nmodule" [color=darkgreen];
		}

		"IRC object" -> "Protocol module" -> "PyLink hooks" -> Plugins;
		"Main program" -> "IRC object" [color=indigo] [label="Spawns 1/net"] [fontcolor=indigo];
		"Main program" -> "Dummy IRC\nobject (FakeIRC)" [color=darkgreen] [label="(test suite runner)"] [fontcolor=darkgreen];
	}

	"Protocol module" -> "Remote IRCd" -> "Protocol module";
	Plugins -> "Protocol module" [label="Communicates \nvia*Client/*Server\nfunctions"] [color=navyblue] [fontcolor=navyblue];
	Plugins -> "Main program" [label="Registers commands\n& hook handlers"] [color=brown] [fontcolor=brown];
	"Dummy protocol\nmodule" -> "PyLink hooks" [color=darkgreen];

}