The Environment Division describes the program's physical environment.  It
  also specifies input-output control and describes special control
  techniques and hardware characteristics.

  Format -

  [ ENVIRONMENT DIVISION.

  [ CONFIGURATION SECTION.
  [ SOURCE-COMPUTER. [source-computer-entry] ]
  [ OBJECT-COMPUTER.  [object-computer-entry] ]
  [ SPECIAL-NAMES.  [special-names-entry] ] ]

  [ INPUT-OUTPUT SECTION.
    FILE-CONTROL. {file-control-entry} ...
  [ I-O-CONTROL. [input-output-control-entry] ] ] ]

  Additional Information (explode) :

• SOURCE-COMPUTER
• OBJECT-COMPUTER
• SPECIAL-NAMES
• FILE-CONTROL
• I-O-CONTROL