These are commands (and descriptions) that have been added to the Copperbottom's Folly Ultima Online Shard and may not be available on other shards:

[c ( also [chat ) - This command followed by a space and a message will broadcast a public message to all players.  If used without the message (just [c) it will bring up a list of all players currently online.

[pm ( also [msg ) - This command followed by a character's name and a message will send a private message to a specific player. (usage: [pm copperbottom This shard rocks) This sends the message "This shard rocks" to the user copperbottom.