Shoutbox

sorry, I'm brazilian so my english is so so..
I would to do a ask..
My friend had a plugin, and this plugin, when you click in it, show a message for all on-line contacts
but this message, you choose
so, you choose a message, send this plugin to a person
and when this person click on that, a message will appear for all online contacts

i don't know the name of this plugin
so, if somedody knows
please tell me

my e-mail --> estev3s@gmail.com

Thanks