Embodiments of the invention provide a functional architecture having a control unit inside the firewall, and {HEAD ~ a proxy server} outside {TAIL ~ the firewall} 
Embodiments of the invention provide a functional architecture having a control unit inside the firewall , and { HEAD ~ a proxy server } outside { TAIL ~ the firewall }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL