Header file 900 may have {HEAD ~ definitions} of virtual types and {TAIL ~ values} for each virtual type coded in a computer program 
Header file 900 may have { HEAD ~ definitions } of virtual types and { TAIL ~ values } for each virtual type coded in a computer program
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH