From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
Newsgroups: comp.os.msdos.programmer,comp.os.msdos.djgpp
Subject: Re: Is DOS dead?
Date: Sun, 12 Mar 2000 09:17:04 +0200
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On Sat, 11 Mar 2000, Damian Yerrick wrote:

> >Michael Tippach wrote:
> >> There is support for VBE. There is no (AFAIR) support though for linear
> >> frame buffer use, due to DPMI function 0x800 always failing under NT.
> >
> >Any idea why NT doesn't implement function 0x800?
> 
> For protection perhaps, so programs don't overwrite the NT kernel?

Function 0x800 is for mapping memory-mapped devices into your address
space.  If NT is afraid someone will use that function to gain access
to kernel memory, it could fail all calls that do not specify memory
used by one of the known devices.