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__dpmi_segment_to_descriptor
============================

Syntax
------

     #include <dpmi.h>
     
     int __dpmi_segment_to_descriptor

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

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

DPMI function AX = 0x0002

This function returns a selector that maps to what the real-mode
segment provided would have referenced.  Warning: this is a scarce
resource.

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

-1 on error, else the selector.

Example
-------

     short video = __dpmi_segment_to_descriptor(0xa000);
     movedata(_my_ds(), buffer, video, 0, 320*200);