hi there what is the point of Callback anyone got and idea

hum… did you look around the website at all by any chance?

On the left hand side,of the website, fifth option down is something called documentation, hover over it and a menu pop’s out, then select Module Documentation, take a look at the 10th item down in the list…

or even easier, when you are in the callback module (or any module), click the help tab at the top and it will open a window and take you to the associated web page, if there is one.