In the ENVIRONMENT DIVISION of a program, you describe the aspects of the program that depend on the computing environment.
Use the CONFIGURATION SECTION to specify the following items:
Use the FILE-CONTROL and I-O-CONTROL paragraphs of the INPUT-OUTPUT SECTION to:
Example: FILE-CONTROL paragraph
related tasks
Specifying the collating sequence
Defining symbolic characters
Defining a user-defined class
Identifying files to the operating system (ASSIGN)
related references
Sections and paragraphs (COBOL for AIX Language Reference)