WoW API: SendAddonMessage

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Sends a message to hidden AddOn channels. Introduced in Patch 1.12.

SendAddonMessage("prefix", "text", "type")

Parameters

prefix: String - Message prefix, can be used as your addon identifier.
text: String - Text to send.
type: String - AddOn channel to send to. Valid types are "PARTY", "RAID", "GUILD", "BATTLEGROUND".

SendAddonMessage( "CTRA", "User Data: XYZ", "RAID" );

Calling this function results in the event CHAT_MSG_ADDON being invoked on all clients in the PARTY, RAID, BATTLEGROUND or GUILD channels.
Messages sent to "RAID" while in a party will get delivered to "PARTY"; messages sent to "RAID" or "PARTY" while not in a group will not be delivered. To send to your battleground group, "BATTLEGROUND" must be used.
The message will not be affected by the player's level of drunkenness.
The tab character ("\t") is used as a delimiter between the prefix and the message text -- because of this, \t can not be used as part of prefix. The combined length of message and prefix can be at most 254 characters (255th is the tab character used to delimit the two), lenght above 254 will disconnect you.
Like SendChatMessage, sending a message containing "\n" will disconnect you.