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