an indication mechanism configured to indicate that said information file has sufficiently changed; {TAIL ~ said indication mechanism} coupled to said subscription mechanism and responsive to {HEAD ~ said notification message receiver mechanism} 
an indication mechanism configured to indicate that said information file has sufficiently changed ; { TAIL ~ said indication mechanism } coupled to said subscription mechanism and responsive to { HEAD ~ said notification message receiver mechanism }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD