Section 13,11: CALL

 Transfers control and passes arguments to a subprogram.  Statement
 format:

    CALL sub[([a][,[a]]...)]

    sub  Is the name of a subroutine, or other external 
         procedure, or a dummy argument associated with 
         a subroutine subprogram or other external procedure.

    a    Is a value to be passed to the subroutine.  

 If you specify an argument list, the CALL statement associates the
 values in the list with the dummy arguments in the subroutine.  It
 then transfers control to the first executable statement following
 the SUBROUTINE or ENTRY statement referenced by the CALL statement.

 The arguments in the CALL statement must agree in number, order,
 and data type with the dummy arguments in the subroutine.  They can
 be variables, arrays, array elements, records, record elements,
 record arrays, record array elements, substring references,
 constants, expressions, Hollerith constants, alternate return
 specifiers, or subprogram names.  An unsubscripted array name or
 record array name in the argument list refers to the entire array.

 An alternate return specifier is an asterisk (or ampersand)
 followed by the label of a statement in the program unit containing
 the CALL statement.

 DEC Fortran allows direct or indirect recursive calls to
 subroutines, if you specify the -assume recursive compiler option.