PR Storm is utter junk and i wouldn't recommend using it. I done some testing with it on some junk info's and the results were bad. What it does is referer spam as Smyrl said, basically it visits 1,000s of sites to simulate a visitor going from your domain to the target domain so your URL shows up in their referer log. Then it relies on these websites publishing their refer logs on the web, hence creating a backlink to your site. If you check the list of sites, they contain questionable sites such as gay-midget-porn.com and other such domains. If your happy about 100's of porn, banned and spammy sites linking to you then go for it but my advice is don't.
yes i too agree above statement I used another software which is similar 2 this .. do the natural work rest u can get results easily ...
mentos thankyou for your reply and opinion - ive used it and the results speak for them self - from pr0 to pr4 in one update not to mention the alexa results . i dont just use pr strom - it comes with a great deal of other tools and you are maybe talking odf an old version.