An application program from a plurality of application programs is executed on {HEAD ~ an operating system} of {TAIL ~ a personal computer} 
An application program from a plurality of application programs is executed on { HEAD ~ an operating system } of { TAIL ~ a personal computer }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL