Path: utzoo!mnetor!uunet!husc6!ncar!ames!ucsd!sdcsvax!ucsdhub!hp-sdd!hplabs!hp-pcd!hpcvlx!everett
From: everett@hpcvlx.HP.COM (Everett Kaser)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Setting DOS errorlevel in C  (How?)
Message-ID: <1180008@hpcvlx.HP.COM>
Date: 16 Mar 88 17:44:10 GMT
References: <4831@sigi.Colorado.EDU>
Organization: Hewlett-Packard Co., Corvallis, OR, USA
Lines: 7

It's set automatically by the 'exit' function; i.e.,

        exit(0);         exits and sets ERRORLEVEL to 0
        exit(1);         exits and sets ERRORLEVEL to 1
        exit(2);         exits and sets ERRORLEVEL to 2

I hope you see the trend here. :-)