A library of {HEAD ~ programs} is maintained on a host workstation designated as a controlling workstation within {TAIL ~ the workgroup} 
A library of { HEAD ~ programs } is maintained on a host workstation designated as a controlling workstation within { TAIL ~ the workgroup }
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL