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