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OS is software that sits between the hardware and the users; this is the user interface
The OS also provides device drivers so that the applications can communicate with the hardware
The kernel is the privileged central part of the OS
Well-known OS/user interfaces include
Command line: DOS, Unix, Linux
GUI: Windows 9x/NT/Me/2000/XP/2003/Vista, MacOS, Unix/Linux X-Windows (Gnome, KDE)
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