eXtra Buttons is a free app that can be used to add buttons to a window. Since all we have is a Windows user is a set of three buttons, Minimize, Maximize, and Close, which is clearly not enough and is counter-productive. With eXtra Buttons, you can create your own set of buttons and place it on top of a window. There are a lot of buttons that you can add depending on the task that you want it to do. So, basically, you will have a series of buttons on top of the window and you will decide what those buttons can do.