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From: shor@sphinx.UChicago.UUCP (Melinda Shore)
Newsgroups: net.micro.pc
Subject: Re: set environment
Message-ID: <228@sphinx.UChicago.UUCP>
Date: Wed, 13-Mar-85 18:47:02 EST
Article-I.D.: sphinx.228
Posted: Wed Mar 13 18:47:02 1985
Date-Received: Thu, 14-Mar-85 06:22:07 EST
References: <1200005@ur-univax.UUCP>
Organization: U. Chicago - Computation Center
Lines: 22

[]
>From: marc@ur-univax.UUCP
>The DOS manual talks about adding things to the environment with the SET
>ENVIRONMENT command and goes on to say that things in the environment can be
>accessed from within an application.  Can anyone tell me how to do this or
>where it is documented ?

Check out the section of the manual on the DOS program segment.
Basically, the "environment variables" are strings (both identifiers
and values) in memory, the beginning address of which is located at
offset 2C of the program segment prefix of the program starting up.
When a program starts up, DS and ES point to the program segment
prefix.  As I recall, DS tells us which segment, ES the address
within the segment.

-- 
Melinda Shore 
University of Chicago Computation Center
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