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Message-ID:	<5587B696.10304@gmail.com>
Date:	Mon, 22 Jun 2015 03:17:42 -0400
From:	"Frank Sapone (emoaddict15 AT gmail DOT com)" <djgpp AT delorie DOT com>
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To:	djgpp AT delorie DOT com
Subject:	Detecting Windows NT in DJGPP
References:	<201506091712 DOT t59HCPci004068 AT delorie DOT com> <557739E0 DOT 6070608 AT gmail DOT com> <CAB9Rao93XrKFBpUDnZdjCz+rEXHGOU2RNKdou2oMLJOk802LnA AT mail DOT gmail DOT com> <55775E64 DOT 2090901 AT gmail DOT com> <CAB9Rao-Njdr-CB=vqHnb+TVDmXu3eXqsB5CHB7V0kDwBEsM-WQ AT mail DOT gmail DOT com> <5579ED42 DOT 6070309 AT gmail DOT com> <CAB9Rao8cvu3hLEf=KsRWn7woXka0F9Aax7uM9Jj5QqCO=1bL8w AT mail DOT gmail DOT com> <5579FE8D DOT 3080501 AT gmail DOT com> <557B436F DOT 1050101 AT gmx DOT de> <fe60143b-fe03-451f-84d4-a7d59a67cefc AT googlegroups DOT com> <d1f33445-bef3-42d5-a343-55fed9868908 AT googlegroups DOT com> <779efaf6-8ebf-4f2a-a526-a2773e3909b4 AT googlegroups DOT com> <4131b54f-b34d-4a84-ada6-3443ed9efce9 AT googlegroups DOT com> <20150618-004800 DOT 313 DOT 0 AT Your-Name-Here DOT News> <fda73a64-d86c-400d-a78d-4d11b067d138 AT googlegroups DOT com> <CAA2C=vCYCjih4r38XZ45TURJPxpKAF40kakFM8iRizDH08QbVQ AT mail DOT gmail DOT com> <65ad24c7-0888-4526-9395-e262f348a021 AT googlegroups DOT com> <5584B697 DOT 60303 AT gmail DOT com> <CAA2C=vDpU5XoXZ=3MNiaE1zY8FEwGm_Cki4bd8mQpBFJ9DZ2Vw AT mail DOT gmail DOT com>
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Reply-To:	djgpp AT delorie DOT com

Hey everyone,

Quake 1 has a rather simple test for detecting if it's being run on 
Windows 9x:

     __dpmi_regs                             r;

     r.x.ax = 0x160a;                /* Get Windows Version */
     __dpmi_int(0x2f, &r);

     if(r.x.ax || r.h.bh < 4)        /* Not windows or earlier than Win95 */
         <code>
     else
         <code>

I'd like to detect if the program is running in NTVDM/Win XP/etc.  I 
know you can check for WINDIR as an evironment string, but that could be 
unreliable
from someone with a bad autoexec.bat.

Is there any other way to detect if it's in an NT environment?

Frank

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