Ixsub

seqdiag {

 clientTR;
 clientBrowser;
 transitionServer;
 extantServer;

 clientTR -> transitionServer [label =  "submits traceroute output"];
 transitionServer -> transitionServer [label = "parses output"];
 transitionServer -> extantServer [label = "submits parsed output"];
 extantServer -> transitionServer [label = "sends traceroute id"];
 transitionServer -> clientTR [label = "sends traceroute id"];
 clientTR -> clientBrowser [label = "opens id'd view"];
 clientBrowser --> transitionServer [label = "requests transition view via traceroute id"];
 clientBrowser --> extantServer [label = "requests extant view"];

}