From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Detect NT from within NT DOS emulation?
Date: Sat, 01 Jan 2000 08:09:50 +0200
Organization: NetVision Israel	
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To: djgpp AT delorie DOT com
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Damian Yerrick wrote:
> 
> Is there a reliable way to detect that a DJGPP program is running
> under Microsoft Windows NT?

Call the library function _get_dos_version with a non-zero argument.  If
it returns version 5.50 (0532 in hex), you are on NT.

If you want this test to be portable, look at the source of
_get_dos_version (its source file is src/libc/dos/dos/getdos_v.c in
djlsr202.zip), see what function of Int 21h it issues when called with a
non-zero argument, and do the same in your program.