wherein the client device and the application operate agnostic to {HEAD ~ existence} of {TAIL ~ the application extender} 
of
wherein the client device and the application operate agnostic to { HEAD ~ existence } of { TAIL ~ the application extender }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL