I have looked it over too.
You too can do the same and should.
.jar files are like
.zip files.
Just extract the
.jar file to a folder using a archiver. I use WinRAR.
You'll see the different classes in that folder.
Now goto
[Only registered and activated users can see links. Click Here To Register...] and look for jave decompiler or search the web for one.
Use that on the classes to open. Look for refernces to .com's, .net's, .org's, .biz's and so forth.
Some are easy to find they will have a packetstore.class with those refernces in them.