>Unnsse wrote
 >Do people pause / resume there work in Smalltalk loading the .pr
 >files or the .image files or the .st files (it does seem that the .st
 >files only contain one small source listing)....
  Hi,

I'm not a professional programmer, but I'd like to answer this  
question since I have a comparison with my everyday work that might  
be useful here (and I am using Mac OS X too).

Unless I misunderstood the whole thing, IMAGES  are used for pausing  
and resuming work. This is how I see it :

  I am a translator, and in my work, I usually end up with many  
windows and applications opened at the same time ( documents on the  
subject I’m translating in different formats, dictionaries, my own  
vocabulary database, former translations I've done, Word or a  
specific translators' program, MANY web pages, etc). When I work  
late, I don't like closing everything and shut down the computer, in  
case I forgot saving or bookmarking something important. I prefer  
putting it to sleep so in a few second I can have my Mac exactly as I  
left it, with all the documents I found useful still opened, the  
dictionaries on the last definition I read, etc. Actually, it's just  
like a real desk cluttered with books, documents and dictionaries.

It's exactly the same with Squeak and images. You save your image  
when you quit, and next time you open it you have your all  
programming environment exactly as you left it, with your Browsers  
opened on the classes and methods you last examined, Transcript and  
Workspace windows showing everything you did recently, etc. I often  
use a Workspace like a Post-it (or like the Mac “stickies”) to  
remember important information when I open my image. In the same way  
I even keep a "programmer's diary" where I describe what I’m trying  
to do and the progress I make. I can’t imagine a more user-friendly  
system.
.pr, I think, are used for moving things around.
Olivier.