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