The invention finds one particularly advantageous application in the field of electronic transactions effected by means of {HEAD ~ an electronic memory card} operable with {TAIL ~ a portable payment terminal} 
operable with
The invention finds one particularly advantageous application in the field of electronic transactions effected by means of { HEAD ~ an electronic memory card } operable with { TAIL ~ a portable payment terminal }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL