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