According to Jim Hill, (I know, I know, not the best source of information, but a good read anyway)
http://jimhillmedia.com/mb/articles/showarticle.php?ID=1397
EDITED: Deleted the copy of the article and only kept the link... Sorry Jim Hill.
http://jimhillmedia.com/mb/articles/showarticle.php?ID=1397
EDITED: Deleted the copy of the article and only kept the link... Sorry Jim Hill.