Magnet left is a standard for Internet hyper+on the left of for downloading files. It is used in particular in Peer ton peer nets. Here he is to be regarded rather as URN as as URL, there he not the place, but contents marks. Magnet on the left of it is very useful in the sense that they permit a certain file to left, without having to take on it consideration, where this is stored or that the left becomes invalid.

Introduction

Magnet left is comparable with ISBN a book number in the sense that certain contents are only designated ("“resources"”). Two different files have never the same magnet left, on the other hand the same file, which is found in different places in the Internet, has always the same magnet left. That is exactly the same as with the ISBN numbers: Two different books have never the same ISBN number, but a certain book has always the same number independent of the location.

Use

Contrary to ISBN numbers magnet on the left of automatic from the file content it is produced why one does not need a central organization to the allocation of numbers. For this reason they are particularly popular "“more guaranteed"” as at the net municipality search word in Peer ton Peer nets, which ensures that nothing else is actually downloaded as the file intended by the link distributor.

Another advantage in the use of magnet on the left of is in the simple handling and platform independence. The same magnet left can be used in most diverse applications on nearly each operating system for downloading. Because magnet on the left of scarce and precise are, they can be called easily by CoPy and paste in enamels or be inserted as text lines with the Chatten, which does not go for example with BitTorrent files so simply.

Technical description

Other one than other kinds from left (for example HTTP or ftp) is that magnet left no URL, but another kind of URI (called URN), because it designation not the place of resources, so which one could refer these directly. In Peer ton peer nets this means that resources must be first looked for, in order to find one or more so-called sources, so that one can refer the file. For this reason the exchange stock exchange users use mainly such magnet on the left of, which represent only one Hash value, in order to identify the file. However this is not the only possibility. Also memory places can be indicated, in order to avoid or limit the expenditure for the search. Here is an example of a full-qualified magnet left:

xt=urn: sha1: YNCKHTQCWBTRNJIV4WNAE52SJUQCZO5C

In this example contain the left only a SHA1-Hash-Wert, which identifies a file or resources clearly. It does not describe, where this resources can be found. A suitable searching system is needed, in order to be able to access the file, for example a Peer ton peer program.

In magnet left the system different parameters are permitted in the form of name/pairs of values. Here the most important:

xt stands for "“exact topic"” and from a URN one follows.

xs stands for "“exact substitutes"” and from URL one follows, corresponds thus to the classical hyper+left.

as stands for "“acceptable substitutes"” and can alternatives too xt indicate.

kt stands for "“keyword topic"” and means it is by keywords for resources with this file name to be searched. The keywords are separated with plus signs.

DN stands for "“display name"” and indicates typically the file names, said a name by that resources is more exactly presented.

mt URL stands the place of a list (thus a file) for "“communist manifesto topic"” indicates with the help of, in which then the actual are left.

Distribution of files

In order to distribute a file by magnet on the left of, the user produces for the Peer ton peer net program magnet left by hand or with the help of a program, usually. He distributes the left then for example over an Internet side. Current versions of the most important Browser understand these left and start and/or hand them over then to a suitable program.

Related links

• Web page of the MAGNET URI project
• Bitzi, a magnet search machine/listing.
• Azureus an open SOURCE Bittorrent Program, which can treat some kinds of magnet on the left of, if DHT is switched on.
• LimeWire - an open SOURCE Gnutella Servent, which supported as the first P2P-Anwendung magnet on the left of.
• Shareaza - an open SOURCE Peer ton peer program. Supports several nets at the same time (Gnutella, Gnutella2, Edonkey).
• TrustyFiles - another Peer ton peer program. TrustyFiles integrates Hash values from Gnutella, Kazaa/nearly TRACKs, and Edonkey in magnet on the left of, and makes thereby searches possible in Gnutella, Gnutella 2, Kazaa/nearly TRACKs, Edonkey, and Overnet. (Caution Adware!)
• Freebase a web page, which uses magnet on the left of software free for indexing.

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