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 {HEAD ~ a listing} of the input and output provided to {TAIL ~ the external program} 
provided to
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 { HEAD ~ a listing } of the input and output provided to { TAIL ~ 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 HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL