Generally, when BitComet first runs in your computer with Windows XP system, you will be notified to set the firewall to block or unblock BitComet, if you enable the system firewall. In this case, you should set it as “unblock”. Or else, you need to change some settings of the firewall according to this guide. 

Click “Start”->”Settings”->”Control Panel”->”Windows Firewall”, make sure that “Don’t allow exceptions” is unselected whether the firewall is on or off.

[20081008]

Core Improved: improve Long-Time Seeding module

[20080928]

GUI Bugfix: save location displayed in HTTP/FTP task properties dialog is incorrect
Core Bugfix: stability issue caused by memory access volation

[20080926]

GUI Improved: split save location of BT task into 2 parts: save path and filename for single-file task, save path and subfolder for multi-files task.
GUI Improved: when add new BT task, start now/start later combo box changes to 2 buttons below in the dialog
GUI Improved: remove "set as default" button in BT and HTTP/FTP task properties dialog. Save path of new task will be added into candidate directory list in option dialog automatically.
GUI Improved: new candidate directory list in option dialog. The directories in list can be pick up easily when add new task.
GUI Improved: rewrite batch HTTP/FTP download dialog and download all dialog. They are merged into a new designed batch download dialog, which is more convenient.
GUI......

   GUI Improved: rearrange main menu, "tools" changes to "software", "options" changes to "tools"
    GUI Improved: add submenu to select default save directory in tools menu
    GUI Improved: improve directory setting panel in option dialog. double click to set default save directory
    GUI Improved: new Web Interface setting panel in option dialog
    GUI Improved: add MD5 verify pane to HTTP/FTP task properties dialog
    GUI Improved: downloaded files can be moved to candidate directory from context menu of task list
    GUI Improved: add downloaded size and uploaded size columns in task list (hidden by default)
    GUI Improved: remove Flv player from install package
    GUI Improved: improve Long-Time seeding display in peer list
    GUI Bugfix:   fix some translation errors.
  ......

Torrent File Format

Tracker HTTP Protocol before v0.59

---

Please note: The Tracker HTTP Protocol is changed in v0.59 and later!

[Request] Local IP Support

• "&localip="

Add internal IP announce so that peers in one subnet could connect to each other.

[Request] Hide myself

• "&hide=1"

Tell tracker do not tell my IP to others. e.g. Listening port is closed, no one can connected to me.

[Response] alias tracker reporting

• "tracker_alias_url"

Contents a list of alias trackers. If in the same server, server domain can be omitted. e.g. udp://:8080/

BitComet is a p2p file-sharing freeware fully compatible with BitTorrent, which is one of the most popular p2p protocol designed for high-speed distribution of 100MB or GB sized files. BitComet is a powerful, clean, fast, and easy-to-use bittorrent client.

The core of BitComet is completely written in C++ (STL), one of the most efficient languages. This makes it quite different from the original client (written in python), and those written in java or other language. The development of BitComet began in Aug, 2003. After more than two year hard work, now the core is stable and fast with very low CPU usage. It is reported that it can even working smoothly on AMD K6 266MHz MMX with 128M RAM.

BitComet is designed for multiple simultaneous downloads. Because the efficiency of the core, it can run a lot of task simultaneously. It is reported by a site administrator that it runs well when having 100+ simultaneous uploading tasks. Moreover, you can even select......

BitComet is a p2p file-sharing freeware fully compatible with BitTorrent, which is one of the most popular p2p protocol designed for high-speed distribution of 100MB or GB sized files. BitComet is a powerful, clean, fast, and easy-to-use bittorrent client.

The core of BitComet is completely written in C++ (STL), one of the most efficient languages. This makes it quite different from the original client (written in python), and those written in java or other language. The development of BitComet began in Aug, 2003. After more than two year hard work, now the core is stable and fast with very low CPU usage. It is reported that it can even working smoothly on AMD K6 266MHz MMX with 128M RAM.

BitComet is designed for multiple simultaneous downloads. Because the efficiency of the core, it can run a lot of task simultaneously. It is reported by a site administrator that it runs well when having 100+ simultaneous uploading tasks. Moreover, you can even select......

BitTorrent is a peer-to-peer file-sharing protocol designed by Bram Cohen, and a family of of BitTorrent compatible clients (software) support this p2p protocol. BitComet is a C++ BitTorrent client running on Windows, compatibale with BitTorrent along with many enhancement.

BitTorrent is designed to facilitate file transfers among multiple peers across unreliable networks. While downloading, clients will simultaneously upload already downloaded data to other BitTorrent clients interested in that data.

The HTTP/FTP way (Problem: more customers require more bandwidth):

The BitTorrent Solution:......

BitTorrent is a peer-to-peer file-sharing protocol designed by Bram Cohen, and a family of of BitTorrent compatible clients (software) support this p2p protocol. BitComet is a C++ BitTorrent client running on Windows, compatibale with BitTorrent along with many enhancement.

BitTorrent is designed to facilitate file transfers among multiple peers across unreliable networks. While downloading, clients will simultaneously upload already downloaded data to other BitTorrent clients interested in that data.

The HTTP/FTP way (Problem: more customers require more bandwidth):

The BitTorrent Solution:......

BitTorrent is a peer-to-peer file-sharing protocol designed by Bram Cohen, and a family of of BitTorrent compatible clients (software) support this p2p protocol. BitComet is a C++ BitTorrent client running on Windows, compatibale with BitTorrent along with many enhancement.

BitTorrent is designed to facilitate file transfers among multiple peers across unreliable networks. While downloading, clients will simultaneously upload already downloaded data to other BitTorrent clients interested in that data.

The HTTP/FTP way (Problem: more customers require more bandwidth):

The BitTorrent Solution: customers help distribute content

That's the reason why bittorrent sometimes works faster than ordinary http / ftp. In order to use this technology, users need to use a BitTorrent client, and a tracker is needed to help users know about each other.

-- The graph comes from Bram Cohen's homepage

BitTorrent is a peer-to-peer file-sharing protocol designed by Bram Cohen, and a family of of BitTorrent compatible clients (software) support this p2p protocol. BitComet is a C++ BitTorrent client running on Windows, compatibale with BitTorrent along with many enhancement.

BitTorrent is designed to facilitate file transfers among multiple peers across unreliable networks. While downloading, clients will simultaneously upload already downloaded data to other BitTorrent clients interested in that data.

The HTTP/FTP way (Problem: more customers require more bandwidth):

The BitTorrent Solution: customers help......

BitTorrent is a peer-to-peer file-sharing protocol designed by Bram Cohen, and a family of of BitTorrent compatible clients (software) support this p2p protocol. BitComet is a C++ BitTorrent client running on Windows, compatibale with BitTorrent along with many enhancement.

BitTorrent is designed to facilitate file transfers among multiple peers across unreliable networks. While downloading, clients will simultaneously upload already downloaded data to other BitTorrent clients interested in that data.

The HTTP/FTP way (Problem: more customers require more bandwidth):

The BitTorrent Solution: customers help......

BitTorrent is a peer-to-peer file-sharing protocol designed by Bram Cohen, and a family of of BitTorrent compatible clients (software) support this p2p protocol. BitComet is a C++ BitTorrent client running on Windows, compatibale with BitTorrent along with many enhancement.

BitTorrent is designed to facilitate file transfers among multiple peers across unreliable networks. While downloading, clients will simultaneously upload already downloaded data to other BitTorrent clients interested in that data.

The HTTP/FTP way (Problem: more customers require more bandwidth):

The BitTorrent Solution: customers help distribute content

That's the reason why bittorrent sometimes works faster than ordinary http / ftp. In order to use this technology, users need to use a BitTorrent client, and a tracker is needed to help users know about each other.

-- The graph comes from Bram Cohen's homepage

Why we need to “Align File to Piece Boundary”?

A torrent is a file that contains the basic information about a file or set of files. BitTorrent Clients exchange these files according to this information. The clients do not transfer files by files but by pieces which have the same size. All the files in this torrent are splitted into pieces, the size of which has been appointed by the torrent file. If there is more than one file to transfer, there might be some pieces contain head of file A and meantime tail of file B. As a result, although all the content in file A downloaded, the status of the file might keep permanent “99.9% finished” because some content from file B in this piece has not been downloaded. To resolve this problem, we have to make every piece only contain content from the same file. In BitComet, we implement this function by “Align File to Piece Boundary”   

 How......

Find a Torrent File and Download

Task Propreties

BitComet will open automatically once finishing downloading torrent. Then a dialogue as following picture will popup with: Normal, Advanced and Task Link. You can change tab with clicking or it will default Normal.

Normal

Save Location: You can change save location of the download files in the computer through clicking ?Browse? or putting URL in the ADD.

Task: Default is to download and start immediately. It means downloading this task immediately. If you choose start manually, you need to start downloading task manually in future.

File Name: You can download......

The function of Intelligent Disk Cache is once an important reason why people choose BitComet. It is designed for fast downloaders. When uploads or download rate exceeds 500kB/s or even more than 1MB/s, a carefully designed disk cache mechanism in BitComet will greatly improved the hard-disk performance by decrease the read and write frequency of your hard disk. So that the life time of hard disk can be longer. 

How to set the cache size?

Select “Option”->”Preferences”->”Advanced”->”Disk Cache”

The latest BitComet has an innovative function to rename file intelligently.

Preview while downloading: preview of MP3, rmvb, wmv, and so on, is available during downloading process.

With Bitcomet （ version 0.60 or above） You could preview the videos only minutes after downloading begun instead of waiting dozens of hours to finish the download. At present, most of the video files on internet have huge sizes, especially .divx files, even bigger than 1G. And there are some torrents containing fake contents which may waste you lots of time to download. With this new function, you could check the content by preview files and decide whether to continue download or remove the download tasks and files.

How to preview a video file?

Right click a torrent and select “Play”, and then make the checkbox before your wanted file checked, click on “Preview” to play.

......

he new version of BitComet can download any video from any video sites, including YouTube, Google Video, dailymotion, glumbert, metacafe, ifilm, guba, and any other sites you want.

1. Open the webpage containing flash videos.

    Right click on the blank part of the page (note: do not click on the video frame),

    Select “Download specific using BitComet” and click on “Download Videos”.    

2. The webpage will be reloaded again in BitComet Resource Browser”......

Windows XP SP2 limits TCP connection attempts to 10 (quite small ). If there are more concurrent TCP connection attempts, Windows generate a warnning: EventID 4226: TCP/IP has reached the security limit imposed on the number of concurrent TCP connect attempts. Since XP SP2 there are only 10 concurrent TCP connection attempts possible, while in SP1 it has not been limited. (A connection attemp is a query to a computer, if it accept the TCP connection or not. If the computer is for example no more existent, it will be waited for a few seconds, until a timeout occurs and the connection attemp get canceled. )

BitComet 0.55 or above was modified for SP2 so that they can work in SP2 without any configuration. However, it may cause slow speed at the beginning of downloading, since less peers can be connected at the same time. For those behind NAT or firewalled user, a patch in the option dialog in version 0.71 or later is recommended to fix......

Popular software update checker is a new feature of BitComet. When checking software update, BitComet scans your application install folders and windows registry entry, then send software version info anonymously to AppHit.com, to check any new updates of your installed popular softwares available to download. Only takes seconds to help you get the most up-to-date, more steady and more functional software in time.
    
Popular software update checker is a part of BitComet, not a third-part plugin. You can set the check frequency to "every week", "every month", "every quarter" or "never". If "never" is selected, BitComet will not scan the software version info in your computer at all, and will not send any software version info to any server.

......

      A group of digital music file types produced by a variety of software applications (trackers). Mod files include sequencing information and waveform samples, and may be compared to XMF files. It is more a music than a sound format. Files of MOD formmat store digitized instruments and contain a musical score which produces a lengthy composition with a very small amount of data. There have been various extensions to this format, but SoundApp only supports a subset using two different drivers. Among them are Amiga SoundTracker, NoiseTracker, Protracker, Amiga StarTracker (4- and 8-track), Oktalyzer (4-8 tracks), Amiga MED/OctaMED (4-16 tracks, MMD0/1/2 formats), IBM FastTracker (4-, 6- and 8-track), IBM TakeTracker (1-32 tracks). Using the ZSS driver, SoundApp also supports S3M (ScreamTracker 3), MTM (Multitracker) and IT (Impulse Tracker). Playback of XM or 669 files is not currently supported by either driver

1.What is PostBar? 

   PostBar(www.tocomet.com) is a community website for BitComet passport users. You can request software support

2.How to find a postbar for certain subject？

   Search Postbar: enter the postbar name to the search box in home page, and pick one from the search result.

   Browse Catalog: click your interested postbar catalog in home page, then pick one from the list.

3.How to edit my post？

   All the posts you submited will......

DivX is video format created by DivX, Inc. DivX became quite popular due to the ability to compress videos to almost 15% of the original size (i.e. 2Gb doen to 700Mb). That means that a full film can be fitted into a CD. What is important, the .divx files retain much of the original quality of the DVD, sometimes the result is even indistinguishable from the source.

Compared to DVD, DivX had some shortcomings. It didn't have interactive video menus, multiple subtitles or audio tracks, chapter points and some other features of DVD. But in June 2005 DivX 6, the latest generation of DivX codecs,was released. DivX 6 can be called a full media container format that supports all above mentioned features of DVD but the files are of much less size.

   MPEG/MPG  is not actually a format but short for Moving Picture Experts Group, a working group of ISO/IEC that develops video and audio encoding standards. But in most cases MPEG is taken for the name of the standard formats introduced by that group.

There are several MPEG formats, all standardized.

MPEG-1 is initial video and audio compression standard. The video quality of this standard is almost as good as a VHS tape.

MPEG-2 compared with MPEG-1, it has better quality of coding, multi-channel sound and higher image resolution. Due to all this MPEG-2 became standard in digital television and DVD industry.

MPEG Audio Layer-3 is used for audio compression and creates almost CD quality sound. Previous versions were MPEG Audio Layer 1 and 2. Today most people know this format as MP3.

MPEG-4 was created to stream DVD quality video at lower data rates and smaller file sizes. MPEG-4 supports video/audio "objects", 3D content,......

   In CP/M-86, CMD is the filename extension used by executable programs. It corresponds to COM in CP/M-80 and EXE in MS-DOS.

   PIFs, or Program Information Files, define how a given MS-DOS program should be run in a multi-tasking environment, notably to avoid giving it unnecessary resources which could remain available to other programs. TopView was the originator of PIFs which were inherited and extended by DESQview and Microsoft Windows, where they are most often seen.

Within Windows, a PIF holds information about how Windows should run the application the PIF corresponds to. The instructions can include the amount of memory to use, the path to the executable file, and what type of window to use (Full screen, window, size in pixels).

The Windows Installer(MSI) (previously known as Microsoft Installer, codename Darwin) is an engine for the installation, maintenance, and removal of software on modern Microsoft Windows systems. The installation information, and often the files themselves, are packaged in installation packages, loosely relational databases structured as OLE Structured Storage Files and commonly known as "MSI files", from their default file extension (compare: .deb, RPM, .pbi). Windows Installer is a significant improvement over its predecessor, Setup API: several new features, such as a GUI framework, the automatic generation of the uninstallation sequence and the powerful deployment capabilities, made Windows Installer a viable alternative to stand-alone executable installer frameworks such as older versions of InstallShield and WISE (later versions are based on Windows Installer) and NSIS.

Microsoft encourages third parties to use Windows Installer......

A screener(SCR) is an advance video or DVD copy of a film sent to critics, awards voters, video stores (for their manager and employees), and other film industry professionals, including producers and distributors.Often, each individual screener is sent out with distinct markings, which allow copies of a screener to be tracked to their source.

In 2003 the MPAA announced that they would be ceasing distribution of screeners to Academy members, citing fears of piracy. A group of independent film makers sued and won a decision against the MPAA. The MPAA later reinstated the screeners with the implementation of a new policy requiring recipients to sign a binding contract that they would not share the screeners with others.

In January 2004, Academy member Carmine Caridi was announced as a "person of interest" in an ongoing FBI investigation into video piracy. He was subsequently expelled from the Academy after he was found to......

The file name extension .com has been used in various computer systems for different purposes. Originally, the term stood for "Command file" and was a text file containing commands to be issued to the operating system. This was the practice on many of the Digital Equipment Corporation mini and mainframe computer systems going back to the 1970s.

With the introduction of microcomputers this use of files ending with the extension .com changed. In MS-DOS and compatible DOSes, and in 8-bit CP/M, a COM file is a simple type of executable file. The name of the file format is derived from the file name extension .com (not to be confused with the .com top-level domain), which was originally the extension used for such files. However there is no actual association between the file format and the file name extension in any but CP/M and very early versions of MS-DOS.