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Originally Posted by pem
They do several things;
1. They open multiple connections to the file which can get round speed limits on a single connection.
2. They can resume an interrupted download at the point it stopped, thus saving the time of having to re-load stuff you already have.
3. Most will allow you to schedule a download you are not in a hurry for - so it will fetch it at a non busy time for instance.
They cannot give you more bandwidth than you already have, whatever they may claim.
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Don't they also prefetch the contents of the links off a page you are viewing so the page should be cached on your PC by the time you have clicked on the link.
Resuming interupted downloads is less of a benefit if you have cable/dsl and a semipermenant IP, its more a benefit for dial up AFAIK