Methods and systems for using {HEAD ~ a foot based interface} to interact with {TAIL ~ a computer} are described 
to interact with
Methods and systems for using { HEAD ~ a foot based interface } to interact with { TAIL ~ a computer } are described
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH