Environment Division

[ [ 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.  [ i-o-control-entry ] ] ] ]

More:

Source Computer Entry

Object Computer Entry

Special Names Entry

File Control Entry

I-O Control Entry