security,memory management and file management
Mac OS X, Linux, and Microsoft Windows are three types of operating systems. Single-user, multi-tasking, multi-user, and real-time operating systems, or RTOS, are different types of operating systems that computers use.
Windows, Linux, Mac OSX are currently the three most popular computer operating systems. Other operating systems are Solaris, BeOS, Google Chromium os, and many more.
OpenTTD can currently be installed and played on three main operating systems. These operating systems are Windows (XP, Vista, and 7), Mac OS X, and Linux.
The top three operating systems in terms of market share are Windows, Mac OS X, and Linux.
these are an examples of operating system - Windows - Linux - Unix - Mac OS
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LGA1366, LGA771, and LGA775
operation systems utility programes(drivers)
The operating equipment of a rotary rig can be divided into three systems: hoisting, rotating, and circulation.
Appleshare,Microsoft Windows server and Novell netware
three activities that constitute the unauthorized practice of law