CCs ENMOD, ENREQ and INCHGFigure 12 displays three separate command codes.The first screen represents an example of CC ENMOD. The example displays CC ENMOD and includes a representation of the taxpayer's Social Security Number.The second screen represents an example of CC ENREQ input fields. CC ENREQ is the prerequisite Command Code to CC INCHG.The third screen is a screen shot of CC INCHG.In this representation of CC ENMOD, all the fields displayed are empty except the NM-CTRL with a representation the taxpayer's name control SADD, a representation of the taxpayer's Social Security Number and 63 following the DOC-CD field.