Windows 8 is part of the Windows NT family of operating systems. Windows NT is a family of operating systems produced by Microsoft, which includes Windows NT 3.1, Windows NT 3.5, Windows NT 4.0, Windows 2000, Windows XP, Windows Vista, Windows 7, Windows 8, Windows 8.1, and Windows 10. The Windows NT architecture is known for its stability, security, and advanced features, making it suitable for both personal and enterprise use.

In Windows, pressing the "Alt" key along with the "Tab" key (Alt+Tab) allows you to switch between open programs or applications. This keyboard shortcut displays a list of open windows, and you can cycle through them by continuing to press the "Tab" key while holding down the "Alt" key, and then release both keys to switch to the selected program.

When you use the copy command (Ctrl+C on Windows) to copy a file or text, the data is temporarily saved in an area of the computer's memory called the clipboard. The clipboard is a temporary storage location that holds the data you have copied or cut until you paste it elsewhere (using Ctrl+V on Windows). The clipboard allows you to move or duplicate data within or between applications.