stiber@maui.cs.ucla.edu (Michael D Stiber) (08/03/90)
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?
--
Michael Stiber
stiber@cs.ucla.edu UCLA Computer Science Dept.
...{ucbvax,ihpn4}!ucla-cs!stiber Machine Perception Laboratory
3564 Boelter Hall,Los Angeles, CA 90024mneerach@b.inf.ethz.ch (Matthias Ulrich Neeracher) (08/06/90)
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
dwal@ellis.uchicago.edu (David Walton) (08/06/90)
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). }