For example if you left click on an icon located on the Desktop, without releasing mouse button move your mouse to a different position (drag) and release that mouse button (drop icon), the location of that icon will be changed. This is called Drag & Drop.
This is very important feature which lets you stay updated. Updates will remove bugs and holes through which your computer can be exploited or through where virus can infect your computer. Updates are also able to add new features to your system.
Configure your Windows Update Go to: START > CONTROL PANEL
Stand By is a power saving option and it is like a sleep mode. While your computer is in Stand By mode, your programs are still running and your computer is like ‘sleeping’, but when you move the mouse or press anything on the keyboard your computer is going to ‘awake’ and leave the Stand By mode.
Turn Off enables you to turn off your computer completely. It is like when you unplug your computer from the power socket.