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