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