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─────EXTERNAL ──────────────────────────────────────────────────────────────
 
     Action
 
     Identifies a user-defined name as an external subroutine or
     function.
 
     Syntax
 
     EXTERNAL name [ [attrs] ] [,name[ [attrs] ] ]...
 
     Parameter          Description
 
     name               The name of an external subroutine or function.
 
     [attrs]            A list of attributes, separated by commas. Valid
                        attributes are: ALIAS, C, FAR, LOADDS, NEAR,
                        PASCAL, VARYING.
 
     Remarks
 
     EXTERNAL can replace an intrinsic function with a user-defined
     function of the same name.
 
     If an intrinsic-function name appears in an EXTERNAL statement,
     that name becomes the name of an external procedure. The
     corresponding intrinsic function can no longer be called from
     that program unit. A name can only appear once in an EXTERNAL
     statement in any given program unit.
 
     Examples
 
           EXTERNAL MyFunc, MySub
     C     MyFunc and MySub are arguments to Calc
           CALL Calc (MyFunc, MySub)
 
     C     Example of a user-defined function replacing an intrinsic
           EXTERNAL SIN
           x = SIN (a, 4.2, 37)
                                    -♦-