+channel 
+ch 
+channel <channel name> 
+channel -<channel name>
This command lists or sets your channels for the online communications system. The 
+com system supports an arbitrary number of case-sensitive named channels. Players who are working as a group can make up a channel name for their group and add it to the list of channels which their 
+com is listening to.
+ch <channel name> sets the default channel for use with the abbreviated communications command, 
=msg. +ch -<channel name> removes a channel from your list. Typing 
+ch without any arguments shows the list of channels that you are currently listening to. You can listen to as many simultaneous channels as you wish. For a general chatting channel, turn to channel 
public.
See also: +com
From the winds.org Helptext - Courtesy Gandalf
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SluggyQBFreak - 06 Feb 2005