index.tpl
Module Development (Form Tools 2)
You're required to include at least one Smarty template to render your index.php page. This template can be located within the main module folder or any subfolder within it and named whatever you want. We suggest index.tpl to keep it simple.
All HTML within Form Tools is generated through the Smarty template language.
Here's the index.tpl file from the Hello World! module. All it does it output a localized "hello world!" string.