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From: mneerach@b.inf.ethz.ch (Matthias Ulrich Neeracher)
Newsgroups: comp.lang.postscript,comp.sys.mac.system
Subject: Re: Multiple Program Versions -- how does the system choose?
Message-ID: <175@neptune.inf.ethz.ch>
Date: 6 Aug 90 12:24:53 GMT
References: <1100.26af57d3@waikato.ac.nz> <1990Jul26.135834.9874@tsa.co.uk> <862@grenada.UUCP> <1990Aug3.014801.24448@caen.engin.umich.edu> <37649@shemp.CS.UCLA.EDU>
Sender: news@neptune.inf.ethz.ch
Reply-To: mneerach@b.inf.ethz.ch (Matthias Ulrich Neeracher)
Organization: Departement Informatik, ETH, Zurich
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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.

Matthias

-----
Matthias Neeracher                                   mneerach@c.inf.ethz.ch
  "I wouldn't recommend sex, drugs or insanity for everyone, 
   but they've always worked for me" -- Hunter S. Thompson