Hopefully this is the right forum for this...

I'm a relatively new user with some technical background (and by this I mean very little), and I'm just trying to get a full understanding of some of the features of Gnutella clients. I've downloaded limewire, as it seems the most popular. Anyway, here are my questions:

1. Does Limewire Pro buy me any nifty tricks? For example, can I search by the SHA hash value? Is there a way to do this in regular old limewire?

2. For security purposes, if I put the download slots per user to 0, and the max slots to 0, is there a way for people to download files off my system? What about if they use a different client? For example, can a BearShare user download these files regardless of whatever else I do?

Thanks for any help guys and take care!