It's Minimizes/Maximizes the window.
Typically (at least in Windows OS), that will at least consist of the Title Bar and (in most cases) the icons to Minimize, Maximize, Restore and/or Close the window.
On a window's Title bar, what does the button with the underscore symbol do?
sometimes
minimise or restore down on some computers XP should say minimise but not 100% sure about it
In MS Publisher, the title bar is the top horizontal bar of the application window that displays the name of the publication you are currently working on. It also contains the minimize, maximize, and close buttons on the right side to manage the window.
Depends on the state
just double click on the title bar OR you can click on the maximize button.
It will maximize the window.
The "Maximize" button, located between the "Close" button and the "Minimize" button.
No, that statement is not true. When the minimize button on a window's title bar is clicked, the window is not closed; instead, it is reduced to an icon on the taskbar, allowing the application to remain open in the background. The window button stays on the taskbar, enabling users to restore the window when needed. Closing a window requires clicking the close button (typically an "X").
The title bar on a computer window typically includes the title of the application or document being viewed. It also often contains buttons for minimizing, maximizing, and closing the window. Additionally, the title bar may display the current file name or location. Some title bars also include menu options for accessing additional features or settings within the application.
Title Bar