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__dpmi_allocate_real_mode_callback
==================================

Syntax
------

     #include <dpmi.h>
     
     int __dpmi_allocate_real_mode_callback(void (*_handler)(void), __dpmi_regs *_regs, __dpmi_raddr *_ret);

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 gives you a real-mode address to pass to TSRs that gets
reflected to your protected-mode handler.  You pass it a register block
to use; it gets filled in with the real-mode registers when your
handler is called, and the registers are set from it when the handler
returns.

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

-1 on error, else zero.