Glossary

Being disconnected from a hub by an Op for a specific period of time. Unlike a Kick, you cannot reconnect to the hub until the ban period has expired.

A slot for downloading files from other users. The number of open download slots determines how many files can be downloaded simultaneously.

A file generated by DC++ which contains a listing of all the files in your shared directories.

The process of creating a hash value (a unique identifier) for a file. This value is calculated from the contents of the file and means you no longer have to worry about file names when searching for alternate sources.

For example, if you have "The UNIX-Haters Handbook.pdf" in your queue and another user has the same file, but called "UHH.PDF" they will have the same hash value and can therefore be used as an alternate source.

Hashing was introduced in DC++ version 0.307.

The Direct Connect system consists of two components - a client (such as DC++) and a hub. A hub is what users connect to in order to chat and find out what files other users have made available.

A list of available public hubs. Note that hub lists do not show all availble hubs. There are many different hub lists available.

Being disconnected from a hub by an Op. You can reconnect immediately after a kick.

See also: Ban

A function to allow you to quickly queue a number of items.

The Match Queue button is found in the file list window. When you open a file list and hit the Match Queue button, if there are any items in the file list that match an entry in your download queue, that particular user is added as an alternate source for the download queue item.

The minimum quantity of files required to gain access to a particular hub. Sometimes known as MinShare.

An Op (or operator) is a person within a hub who has control over aspects of the hub such as kicking/banning users, registering new users and so on.

A hub not available to the general public. Access to a private hub will require registering with the hub owner.

A hub available to the general public. This hub may or may not be located on a public hub list.

When DC++ resumes a file transfer, it will transfer a small amount of the file and then check that it matches with the end of the incomplete file already downloaded. This ensures that the correct file is resumed.

If there is a discrepency between two pieces of data, then a Rollback Inconsistency has occurred and the particular source will be removed. The transfer will be attempted from the next available source.

Note: Once the TTH implementation in DC++ matures, rollback checking will become redundant and may therefore be phased out.

A Rollback Inconsistency is when there is a data mismatch during Rollback checking.

The symptoms of rollback inconsistency are any of the following:

• The words "Rollback inconsistency, existing file does not match the one being downloaded" in either the Errors column of the Download queue or the transfer window.
• The transfer repeatedly starting, running for a few seconds and then disconnecting.

A piece of text which provides information about your current DC++ session. The information that DC++ provides is the DC++ version number, the connection mode (Active or Passive), the number of hubs you are connected to and the number of upload slots you have.

Example: <++ V:0.305;M:A;H3/0/0;S:6>

Artificially restricting network data transfer rates. This is a process which is carried out by some ISPs and/or universities in order to restrict certain traffic types, such as traffic created by file sharing applications. This can be simple restrictions based on source/destination IP addresses and port numbers or more sophisticated restrictions based on traffic analysis.

Also known as "bandwidth throttling".

The lower half of the DC++ screen. It display the current uploads, downloads and connection attempts.

There are many ways to do hashing. TTH (Tiger Tree Hashing) is the method used in DC++.