/sys$common/syshlp/HELPLIB.HLB  —  FORTRAN  Statements  Directives  General Directives, ATTRIBUTES  EXTERN
  Specifies that a variable is allocated in another source file.
  EXTERN can be used in global variable declarations, but it must not
  be applied to dummy arguments.

  EXTERN must be used when accessing variables declared in other
  languages.
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