The DISPLAY statement transfers low-volume data from the program to
  the default system output device or to the object of a mnemonic-name.
  The HP extensions to the DISPLAY statement, Formats 2 and 3, are
  COBOL language additions that facilitate video forms design and data
  handling. Format 4 sets a program variable to the current command line
  argument number to read with a Format 7 ACCEPT. Format 5 sets the name
  of an environment variable or system logical while Format 6 sets the
  value of an environment variable or system logical.