The way it works is exactly the same as an App Store like Apple's or Google Chrome's, with the difference that this one is perfectly integrated into your computer with an icon to the right of your Start button, so you can access it at any time with a single click.
Once you're inside the Pokki interface you just have to select the category you're interested in and download the apps you like best from its extensive catalog. These will download rapidly and will appear to the right of the Pokki icon, so you can access their contents with one click.
Pokki is an excellent program thanks to which you can enjoy loads of free apps instantly on your computer. No complications, no cost: Just a click and voilà.