Each person downloading the file will offer a portion of their upload bandwidth to allow other users to download the same file. By using the upload bandwidth only, the individual user will not see a decrease in their download speed - in fact, the more users there are downloading the file, the faster everyone's individual download speed will be. The Blizzard Downloader is only active when you are downloading files, and only accesses files associated with the data that you are downloading.

The only files that are shared are the ones that the downloader is currently downloading. The downloader does not allow other peers to access arbitrary files on your computer. Files are only shared while the downloader is running.

Yes, when restarting the downloader, you can resume your existing download if you save to the same location.

This FAQ list is unofficial and the authors have no association with Blizzard except as customers. However, an employee of Blizzard made the following commendation:

First of all, it's important to clearly state that Blizzard does not officially support any add-ons. By support, I mean Blizzard is in no way responsible for their proper functioning, and does not guarantee their in-game stability. Blizzard guarantees that their default UI (User Interface) functions at all times, and it does, even though a large part of modders do believe it to be somewhat lacking in versatility. There a two way of viewing this lack of versatility.

Videos belonging to games from Blizzard contain DivX video, but with a different FourCC, namely "BLZ0". To play such videos you need to use ffdshow for decoding DivX video. The regular DivX decoder won't work (unless you manually change the FourCC). If that doesn't solve the problem, then you should use Media Player Classic or VideoLAN to play the file.

There is only room to display info for 39 connections.. a red star means there are more connections that could not be shown. This thing downloads way too fast..it's saturating my connection to the point where anything else is unsuable, or worse, my connection drops!

Zanfel works safely into the dermal layer of your skin, binds to the urushiol oil, and, when rinsed off, takes the oil with it down the drain.