Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!leah!rpi!crdgw1!sagittarius!dixon
From: dixon@sagittarius.crd.ge.com (walt dixon)
Newsgroups: comp.sys.ibm.pc
Subject: Re: prompt $p$g
Message-ID: <884@crdgw1.crd.ge.com>
Date: 20 Jun 89 12:46:58 GMT
References: <1959@se-sd.NCR.COM> <8015@saturn.ucsc.edu>
Sender: news@crdgw1.crd.ge.com
Reply-To: dixon@sagittarius.crd.ge.com (walt dixon)
Organization: General Electric Corp. R&D, Schenectady, NY
Lines: 8

I have no experience with DOS 4.x,  but in DOS 3.x the current working
directory is stored in a data structure known as the current directory
structure (CDS).  The base address of this structure is contained in the
DOS list of lists returned by int 21H ah=52h (undocumented).  There is
one entry for each possible drive (determined by lastdrive=).  The structure
is contiguous and indexed by drive number.  The DOS i/o system parses
this structure when looking for files.  Changing it may do bad things to
dos.