This invention relates to methods and apparatus for improving communications between humans and devices. The invention uses at least two CRC circuits to calculate a CRC value for a string of data. One or more superimposed pocket panels can be coupled to an inside of the first cover panel to define overlapping pockets dimensioned to hold the papers. The antenna portion is configured such that it can be moved between a first position of the card body in which it is contained in the card body and a second position in which it protrudes from the card body.