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__dpmi_free_real_mode_callback
==============================

Syntax
------

     #include <dpmi.h>
     
     int __dpmi_free_real_mode_callback(__dpmi_raddr *_addr);

Description
-----------

Please refer to DPMI Specification: for details on DPMI function   
call operation.  Also see DPMI Overview: for general information.   

DPMI function AX = 0x0303

This function frees the real-mode callback address.

Return Value
------------

-1 on error, else zero.