Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10 5/3/83; site rruxo.UUCP
Path: utzoo!watmath!clyde!burl!ulysses!gamma!pyuxww!pyuxv!rruxa!rruxo!vch
From: vch@rruxo.UUCP (V. Hatem)
Newsgroups: net.micro.pc
Subject: Re: how do you detect redirection
Message-ID: <237@rruxo.UUCP>
Date: Sun, 14-Jul-85 11:47:07 EDT
Article-I.D.: rruxo.237
Posted: Sun Jul 14 11:47:07 1985
Date-Received: Wed, 17-Jul-85 04:31:28 EDT
References: <5156@elsie.UUCP>
Lines: 14

I've been able to detect the redirection of output to lpt1 by using the DOS
Organization: Bell Communications Research, Piscataway N.J.
Lines: 12

function 44h. Set al=0 to get device info, (ah to 44h, of course), interrupt,
(don't forget to set the bx to the file handle (I have the Computer
Innovations C86 Compiler and the handle for stdout is always 1)), and
when you get back, volia - (dx & 1) gives you a nice yes-or-no answer.

I get the impression that you tried this already and you're thinking 
I TRIED THAT! I don't know, it works for me! (DOS 2.10).

good luck,
Vince Hatem