Noticed in Honeycomb http://.../restconf/operational/v3po:vpp-state

{
"vpp-state": {
"bridge-domains": {},
"version":

{ "branch": "16.09-rc0~8-g82e29c4", "name": "vpe", "build-date": "Thu May 19 11:55:59 PDT 2016", "build-directory": "/home/alagalah/git/work/fdio/vpp" }

}
}

We should be able to tell which VPP we are working on, and PID seems the most "likely to be unique" thing.