Existing investments in drivers and {TAIL ~ FC infrastructure} can be preserved, although in alternative embodiments the FAST IOC functionality could be implemented in {HEAD ~ the IOCs drivers} 
Existing investments in drivers and { TAIL ~ FC infrastructure } can be preserved , although in alternative embodiments the FAST IOC functionality could be implemented in { HEAD ~ the IOCs drivers }
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD