By using this method, a user can not only interact with the external program from within the editor environment, but can also create an editor file that stores a listing of {TAIL ~ the input} and output provided to {HEAD ~ the external program} 
By using this method , a user can not only interact with the external program from within the editor environment , but can also create an editor file that stores a listing of { TAIL ~ the input } and output provided to { HEAD ~ the external program }
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 OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD