A depot channel is a channel on an IRC network where you can use the @find command. Depot channels can be found on all the major IRC networks.
In the depot channel, a user can type the @find command, followed by the search string (singer and/or song title). The wildcard characters * and ? can be used in the search string.
If an archive is found on a channel user's machine, the command will return a list of matches. Grabster returns a unique match list.
To request the archive, the user must type in the depot channel !nick and the archive_name.
The @nick command can also be used on the depot channel to obtain information about a user and his or her files.
Channels which are available across an entire IRC network are prepended with a '#', while those local to a server use '&'.
Channels were numbered -- channel 4 and channel 57, for example -- and the channel topic described the kind of conversation that took place in the channel.
One holdover of this is that joining channel 0 causes a client to leave all the channels it is presently on: "CHANNEL 0" being the original command to leave the current channel.