graph vvv
{
 # rankdir=LR
 lurk [href="http://echo.lurk.org:999/"] [label="echo.lurk.org"];
 xpub [href="http://xpub.nl/"] [label="xpub.nl"];
 sandbox [href="http://hub.xpub.nl/sandbox/"] [label="sandbox"];
 lurk--sandbox [label="radiostream"] [color =red];
 sandbox--xpub [label="proxy"]; 
 xpub--lurk [label="<audio>"]
 listener--xpub [label="browser"]
}