Thank you very much!!!

Thank you for the reply. I have tried to use this solution but it can't solve my problem... I need to send to box1 a chat channel or a spell activation...
I need to not overwite the phrases...

Hi all!
I'm a noob in the LUA programmation and I don't understand why when I send a text in a box with the code GUI.Box1:echo(“Hello World!”) I overwrite the previous text and not append under...DO you can help me?
Thank you and sorry for my english