Q:
What are those three little buttons on the upper right-hand corner of an open window for?
A:
Those are the Minimize, Maximize, and Close buttons.
The “X” closes the window.
The “Box” maximizes the program, making it full screen. If it’s already maximized, it looks like a box on top of another box. If you click it in that state, it will make your window smaller.
Finally, the little “_” is the minimize button. It reduces the current window to a Taskbar button. Clicking the button on the Taskbar restores the window to its former state.

We’ve been getting a lot of questions lately from people who are trying to make their windows smaller. I guess big windows are out this year or something.
Anyhow, in order to re-size a window, you need to be sure it’s in a “normal” state, and not Maximized. If your Maximize button is a single box (as shown above), then you can re-size. If it’s a double box, click it and it will turn to a single box.
Then to resize your window, just hover your mouse cursor over an edge or corner of the window you want to re-size. It should turn into a double-arrow. Just left-click, hold and drag till the window is the size you want.
Finally, here’s a hint for all you first time re-sizers: If you resize using a corner (preferably not the corner with the min, max, and close buttons) you can resize both height and width at the same time.

~ Steve
Please, do a favor delete this so that it wont occupy search results list. I reread this 3 times in hope I was wrong but no IT GIVES ANSWER TO OBVIOUS THING!
@Searcher, you would be surprised to how many people I deal with that do not know this, it may be obvious to many people in the field of common sense, but surprisingly, there are people that have not experienced this, so I believe it is a helpful write up. Thank you.
Why are those buttons so close one from another ?
I have lost my minimize button. Please help me get it back. I have the close button.
Hello. And Bye.