Bit-map
Screen to which each pixel is in Memory screen, a memory area accessible.
A program can thus change the color a pixel by modifying its definition directly into the screen memory.
BitTorrent
BitTorrent is not just a solution for peer-to-peer among many others. This ProtocolTo the growing popularity and is widely used as a legal alternative to downloading centralized.
In the tumultuous landscape of P2P, BitTorrent is probably a special case. It adopts a simple principle: the user downloads over a single file located on thecomputer another user, but one of a multitude of users simultaneously, while sending itself to other pieces of the file that is currently downloading.
It's a big difference, especially with the functioning of the FastTrack and Gnutella networks. Of these, the user shares some of his HDD (usually a directory) constantly: when connected, other users can access the hard drive and recover what interests them. The problem arises when several people want to retrieve the same file: a queue is set up, each waiting his turn to "enter" on the hard drives of users who have the file.
With BitTorrent, users upload a file that puts himself available to other users, as and as it downloads it, and when he stops doing (stopping the "torrent"), He does not share anything. Paradoxically, the file will be recomposed by a number of sources (all users who download it themselves at a given time), downloading is much faster than a large number people's interest in him. In fact, with BitTorrent, the more people download a file, and it is fast to download it yourself at the same time.
BitTorrent for all and for all
But although it is widely used today as part of trade illegal files, nothing predisposes BitTorrent to remain the preserve of illegal P2P.
It also notes that there are sites consisting of lists of torrents "legal" (eg "Legal Torrents" www.legaltorrents.com), Containing both music files made available by the labels who own the rights to exploit the latest books of Lawrence Lessig, placed from the outset under Creative Commons license.
Moreover, the method is increasingly used for community sites hosting multiple applications (eg Sourceforge, sourceforge.net)As an alternative to downloading from a server centralized.
BitTorrent can thus be easily used by all producers of content whatsoever. It is even, and this is not the slightest interest, a serious alternative to traditional solutions for make available to the public of large files. The main advantage of the solution is to save the (or) server (s) of the company and its bandwidth : Like the principle of the grid, the load corresponding to the download is shared between users who retrieve the file and peer to peer, and by not doing so - when the virtuous circle has been committed - that rarely uses the server which issued the file first.
In addition, several applications available can create your own torrents, and even act as a tracer for a file you want to provide. The solution is inexpensive and allows small businesses to become distributors of large files to an unlimited number of hardly anyone.
By Cyril Fievet - www.internetactu.net.
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