OS X does not have a task bar like Windows, but instead includes a menu bar, which is fixed at the top of the screen. The OS X desktop interface is called the Finder and includes several standard features. While the change forced Mac developers to rewrite their software programs, it provided necessary performance improvements and scalability for future generations of Macs. This kernel provides OS X with better multithreading capabilities and improved memory management compared to Mac OS Classic. Like NeXTSTEP, OS X is based on Unix and uses the same Mach kernel. OS X was originally built from NeXTSTEP, an operating system designed by NeXT, which Apple acquired when Steve Jobs returned to Apple in 1997. It was called "Mac OS X" until version OS X 10.8, when Apple dropped "Mac" from the name. It was first released in 2001 and over the next few years replaced Mac OS 9 (also known as Mac OS Classic) as the standard OS for Macs. OS X is Apple's operating system that runs on Macintosh computers.
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