Well it's about (re)using file lists before downloading.
For example if i already have a recent file list from a guy that DC++ founds as an alternate source, i wish DC++ first use that "fresh" file list instead of downloading it once again.
Because when you download a file (or files) that has a large number of sources, and you already have almost all file lists of the sources, DC++ downloads them ALL once again, even if they're recent enough...
Of course if DC++ gets the errors "file doesnt exists" because i.e. the file list is too old and the file doesn't exist anymore in the correct directory (for example), it will download once again the list, to fresh it.
But only in this case.
I hope i've been enough comprehensible...
![Wink ;)](./images/smilies/icon_wink.gif)