Party is a function used in Feral-Heart, that can allow a large or small number of people to talk together like they would in local. Except, the text imput into a Party message is retained only to the Party itself, and cannot be seen by anyone who isn't invited to it. Think of it as a more, 'upgraded' version of the Whisper function, except to many people. Party is great for RP, especially if Local chat is going too fast.