The following is a list of the various contract types that are issued, reviewed, and negotiated by Office of Research*, with brief descriptions of the most common contract vehicles we process. Amendment / Modification. A contractual award document that modifies any aspect of an existing award.
All users who have the torrent open make up what is called a swarm. Technically, a seeder is someone who has 100-percent of the pieces that make up the torrent. Initially, the first few leachers within a swarm feed off the seeder.The more seeders the faster the download will go.    Leechers are people who has a negative effect on  the swarm of the torrent. Leechers are commonly the users who  download much than they upload.
Seeding is a process where you keep your BitTorrent client open even after you've finished your download to help distribute the file to other users. If others want to download the same file you just did, they will request chunks (little pieces) of this file from you and many other users (peers).