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