There is no relationship between the number of simultaneous downloads and the number of sources. What I'm saying is that sometimes you'll download a file that will have a few well connected sources and the file will download at good speeds. However, if you download a lot of files at the same time and they all have good speeds, you will maxout your download capacity and slow all of your downloads.

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Lee Evans, President
LeeWare Development
http://www.leeware.com