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__dpmi_simulate_real_mode_procedure_retf_stack
==============================================

Syntax
------

     #include <dpmi.h>
     
     int       __dpmi_simulate_real_mode_procedure_retf_stack(__dpmi_regs *_regs, int stack_bytes_to_copy, const void *stack_bytes);

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

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

DPMI function AX = 0x0301

This function switches to real mode with *all* the registers set from
the structure, including cs:ip.  The function called should return with
a `retf'.  ss:sp and flags must be set to valid values or zero.

You may optionally specify bytes to be copied to the real mode stack,
to pass arguments to real-mode procedures with stack-based calling
conventions.  If you don't want to copy bytes to the real mode stack,
pass 0 for stack_bytes_to_copy, and NULL for stack_bytes.

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

-1 on error, else zero.