Well yes, it is great to show the users some cool texts you've written. But in most installers you have to get info from the user, for example where the installation file is, or if they want to get the installation file downloaded automatically. How do we do this?
There are actually pretty many functions which allows the user to interact with the installer, where the most common maybe is POL_SetupWindow_question. The syntax for the functions is the same as for POL_SetupWindow_message, function "message" "title". The difference is that the user gets Yes/No-buttons instead of "Forward" and "Cancel". We can also (later when we got more experience) use the answer from the user to do different things, depending on the answer. But first we will have to learn about variables.