So basically, I want to make it so that a player will type something. For instance: /a Hello World And "Hello World" will only be sent to a certain group of players who are in the same group as the player sending the message. I've seen this done in faction plugins etc, and I would like to know how it is done. So I need to create a group of players, which will be stored in a .txt and make sure that the message only goes to the players who are in the each others group. I know that there are probably plugins out there that do this, but I would really like to make one of my own, and I have heard this is the place to ask for help. I am new to Java, been learning for about a month, and any help at all would be really appreciated. Thanks.