I was told there is no difference when you use ! or @ upon your own entry. They will stop the join event from being triggered when you join a channel.
Edit - I've gaven it a little test drive and it works without triggering my own entrance by using @ or ! by itself.
Edit again - I've just found that it renders the join event unresponsive when used with @ while you don't have an OP status.
Last edited by Tomao; 09/06/11 11:01 PM.