Well yeah, it gets inserted into the table automatically when someone is zoning and is sent a tell. The command would be for retrieving the message after zoning is completed, as I didn't see any way that automatically sends the messages.
Though, all I did was search Google SVN for "tellque" and got this result:
http://www.google.com/codesearch?q=t...G=Search+Trunk
Searching the SVN often misses entries for whatever reason, so maybe support for sending them automatically is already in.