Xref: utzoo comp.lang.postscript:5700 comp.sys.mac.system:1020
Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!cs.utexas.edu!uwm.edu!linac!midway!ellis.uchicago.edu!dwal
From: dwal@ellis.uchicago.edu (David Walton)
Newsgroups: comp.lang.postscript,comp.sys.mac.system
Subject: Re: Multiple Program Versions -- how does the system choose?
Message-ID: <1990Aug6.153802.25331@midway.uchicago.edu>
Date: 6 Aug 90 15:38:02 GMT
References: <1990Aug3.014801.24448@caen.engin.umich.edu> <37649@shemp.CS.UCLA.EDU> <175@neptune.inf.ethz.ch>
Sender: news@midway.uchicago.edu (News Administrator)
Organization: U. Chicago Computing Organizations, Academic and Public Comp.
Lines: 32

In article <175@neptune.inf.ethz.ch> mneerach@b.inf.ethz.ch (Matthias Ulrich Neeracher) writes:
>In article <37649@shemp.CS.UCLA.EDU> stiber@maui.cs.ucla.edu (Michael D Stiber) writes:
>>I am interested in having two versions of the same program on a hard
>>disk.  However, when I open a document, I want the old version of the
>>program to run.  The system normally will run the later version.  What
>>algorithm and information does the system use to decide this?
>
>I don't remember where I read this, but I think it was a usually well
>informed source.
>
>The system keeps a desktop file (or desktop database on newer systems) where
>for every creator (read this as "for every distinct application" if you
>don't know what a creator is) the location of the application is kept. This
>is updated whenever you copy or move (?? I'm not 100% sure of this) the
>application. So you're right, in general, the latest version is ran.

You're pretty much right: whatever applications were last copied or moved
get put at the top of the desktop database.  If there are multiple creators
of a document (e.g., five copies of Microsoft Word) on a disk, whichever
one is at the top of the desktop file is run when you double-click the
document.  If you want to make one particular copy of an application be
launched, then, you should copy it or move it somewhere.

>Matthias



--

David Walton		Internet: dwal@midway.uchicago.edu
University of Chicago   {  Any opinions found herein are mine, not  }
Computing Organizations {  those of my employers (or anybody else). }