Yeah; and they often download in tiny pieces all around the file - eventually to fill up into the full file. Its quite useful and brings in more sources from other people downloading the same file who have bits you want, or bits you have which they don't so they download them from you while you're downloading from them.
Things like Shareaza, eDonkey, Limewire.
A Knight is sworn to Honour. His heart knows only Virtue. His blade defends the helpless. His might upholds the Weak. His word speaks only truth. His wrath undoes the Wicked.