I'll ask only one more question.

Does Limewire keep track of my broken downloads by the IP of the host?

If it does, this would be the answer for why I don't seem to resume downloads from some hosts.

In the meantime: thank you guys for the anwers for the questions I did not have to ask... Just now I begin to understand how this P2P thing works.

Oh, just one more question: why is the TTL of the query so small? Would a larger TTL clog the network?

Thanks.