I think Gotfryd hit it on the nose in November with a more 
clear solution which is very valuable for users with a slow 
connection, and valuable to minimize hogging bandwidth on 
webservers. He said,

Subject: Re: retransferring/duplicate/slowering 
Author: Gotfryd 
Date: 01/11/2002 20:41 

...
Really, but is possible to save on a 'wishlist' a query
for advanced option, like: "do not reload succesfully
saved files regardless if modified" ?...