The modules used to implement the present invention may be implemented as software, hardware, firmware, or as {HEAD ~ a combination} of software, hardware and {TAIL ~ firmware} 
The modules used to implement the present invention may be implemented as software , hardware , firmware , or as { HEAD ~ a combination } of software , hardware and { TAIL ~ firmware }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL