Final answer:
The statement is false. The Close button closes a window, and to reduce a window to a button on the taskbar, the Minimize button should be used.
Step-by-step explanation:
The statement that the Close button reduces a window so that it only appears as a button on the taskbar is false. In Windows operating systems, the Close button ('X') is used to close the window, which will end the session of that window and remove it from the screen and taskbar unless the program specifically continues to run in the background. To reduce a window to a button on the taskbar, you would use the Minimize button (typically a dash or underscore symbol). This action keeps the program running but removes it from the screen view, and it can be reopened by clicking the button on the taskbar.