Borderless Gaming's interface is simple: to one side you have all the open applications and to the other your favorites. The only thing you have to do is select an application/game and click on the Borderless Gaming button. The application's window will instantly lose its borders and the window will maximize.
The few options in Borderless Gaming allow you to use keyboard shortcuts to make it easier to remove or replace a border, such that when you get tired of playing an 'artificially maximized' game, you can quickly swap back to its original state.
Borderless Gaming is a pretty useful application depending on which game you're playing. Of course, with most modern titles you won't have any problems, but for active gamers of old games and freeware it could prove quite helpful.