In the Macintosh operating system, the menu bar is a horizontal "bar" anchored to the top of the screen.
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Modern Texas Instruments calculators such as the TI-89 series use function keys to open drop-down menus on their menu bar, the menu title acting like the key label.
The features of the operating system included a total lack of a command line interface (which was included in Microsoft's Windows 1.0 introduced in 1985), Finder, and the menu bar.