The IADDRESS function  returns  an  INTEGER_ADDRESS  value  that
  refers  to  a  the  address  of either a VOLATILE parameter or a
  routine, and does not generate compile-time  warnings  (as  does
  the  ADDRESS  function).  The IADDRESS function is commonly used
  for constructing arguments for system services  of  the  OpenVMS
  operating system.

  Syntax:

     IADDRESS( x )

  The parameter 'x' can be of any type except  a  component  of  a
  packed structured type or a routine name.  The parameter 'x' can
  be a variable, parameter, routine, or constant-expression.  When
  IADDRESS  is  used on constant-expressions, the returned address
  is valid for  the  remainder  of  the  program.   Two  calls  to
  IADDRESS with the same constant may not return the same address.

  Note that the VSI Pascal compiler automatically assumes that all
  pointers  refer either to dynamic variables allocated by the NEW
  procedure or to variables  that  have  the  VOLATILE  attribute;
  therefore, you should use utmost caution when using the IADDRESS
  function.   This  function  does   not   generate   compile-time
  warnings.