Library /sys$common/syshlp/basichelp.hlb EXTERNAL  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  The  EXTERNAL  statement   declares   constants,   variables,   functions,
  subroutines,  and  pictures  external  to  your program.  You can describe
  parameters for external functions and subroutines.

  Examples:

  EXTERNAL INTEGER CONSTANT SS$_NORMAL
  EXTERNAL INTEGER Event_flag
  EXTERNAL INTEGER FUNCTION Rect_area (REAL BY REF, REAL BY REF)
  EXTERNAL SUB File_open (LONG BY VALUE, STRING)
  EXTERNAL PICTURE swan_circle

  Additional Information (explode) :

• Syntax