PDF Support (create PDFs from any application).Full preemptive multitasking support, a long-awaited feature on the Mac.TextEdit - new on-board word processor, replacement to SimpleText.Mac OS had previously had the distinction of being one of the few operating systems with no command line interface at all. Terminal - the Terminal was a feature that allowed access to Mac OS X's underpinnings, namely the Unix core.OSFMK 7.3 - the Open Software Foundation Mach kernel from the OSF was part of the XNU kernel for Mac OS X, and was one of the largest changes from a technical standpoint in Mac OS X.Dock - the Dock was a new way of organizing one's Mac OS X applications on a user interface, and a change from the classic method of Application launching in previous Mac OS systems.You can help by converting this article, if appropriate. This article is in list format, but may read better as prose.
