Machine manager 610 understands the physical topology of the networks and keeps track of the location of the physical machines and virtual machines which are members within {HEAD ~ each} of {TAIL ~ the networks} 
of
Machine manager 610 understands the physical topology of the networks and keeps track of the location of the physical machines and virtual machines which are members within { HEAD ~ each } of { TAIL ~ the networks }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL