The command added by this plugin sends a message to someone when he next joins.
This plugin defines two new commands for chatroom tabs:
/tell, /untell, and /list_tell.
List all queued messages for the current chatroom.
Usage: /tell <nick> <message>
/tell <nick> <message>
Send message to nick at his next join.
Usage: /untell <nick>
Cancel all scheduled messages to nick.