(a) Here's some explanations about Hash Tree: (i) http://www.gnutellaforums.com/showth...threadid=32966 & also (ii) http://www.gnutellaforums.com/showth...threadid=41009

(b) Look at the red Stickies at the top of the forum sections, they have links to most commonly asked questions & problems. There is also a search function which you can link to at the top of the page. Also for more reference, see LimeWire: Glossary & also LimeWire: FAQ & also LimeWire: Userguide. When someone replies to your posts you should get an email response to inform you of this.

BTW you posted in the Phex program section of the forums. I have moved your post (thread) to the LW section of forums. This forum caters for many gnutella programs not only LW.