as you download a file, additional data is written (sub dir.) and that file which you are downloading is being shared with others. when your dl is finished, you can leave the client open to keep sharing. if you want to share more files, basically u just run 'maketorrent' and select whatever you want. it will create the 'torrent' file which you then upload to a web server/torrent search page, so others can get the file(s) too.