HP 3000 Manuals

HP COBOL II/XL Programmer's Guide

GLOBAL Data Items and Files 

GLOBAL data items and files can be shared by two or more programs (or
subprograms).  For programs to share a GLOBAL item:

   *   One program must declare the GLOBAL item (data item or file).

   *   The other programs must be nested within the program that declares
       the GLOBAL item.

   *   A program nested within the program that declares the GLOBAL item
       cannot have a local item with the same name and qualification as
       the GLOBAL item.  If it does, references to that name refer to the
       local item rather than the GLOBAL item.

For more information, see Chapter 3 . 


NOTE  If a file is declared GLOBAL in one program, and is opened in
      another program that uses the EXCLUSIVE statement, then the first
      program must declare the file with L in the ASSIGN clause.  This
      enables dynamic locking.

      Similarly, if a file is declared GLOBAL in a program that does not
      write to it, it must declare it with CCTL in the ASSIGN clause to
      enable CCTL.

MPE/iX 5.0 Documentation