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From: "Glaux" <glaux AT centrum DOT cz>
Newsgroups: comp.os.msdos.djgpp
Subject: How to detect WindowsNT/2k/XP from my DJGPP program?
Date: 12 Mar 2007 08:04:58 -0700
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To: djgpp AT delorie DOT com
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Hi,
could you tell me how simply and reliable runtime check if my DJGPP
prog is running under WinNT-XP dos box? I need to exclude some code
from execution under NT.

I used simply checking by getenv("SystemRoot"), where SystemRoot env.
variable is always set on NT systems but getenv is case sensitive so
when I met "SYSTEMROOT" it fails to detect NT and crashed.  I can't
compare every case combination. Other idea?