initiating a content search by submitting {TAIL ~ a search request} to {HEAD ~ the file sharing network}, the search request comprising one or more keywords 
initiating a content search by submitting { TAIL ~ a search request } to { HEAD ~ the file sharing network } , the search request comprising one or more keywords
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH