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