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Operating Systems
When you purchase a computer or mobile device, it usually has an operating system and other tools installed.
As previously discussed, the operating system and related tools collectively are known as system software because they consist of the programs that control or maintain the operations of the computer and its devices. An operating system (OS) is a set of programs that coordinate all the activities among computer or mobile device hardware.
Other tools, enable you to perform maintenance-type tasks usually related to managing devices, media, and programs used by computers and mobile devices.
Most operating systems perform similar functions that include starting and shutting down a computer or mobile device, providing a user interface, managing programs, managing memory, coordinating tasks, configuring devices, monitoring performance, establishing an Internet connection, providing file management and other device or media-related tasks, and updating operating system software. Some operating systems also allow users to control a network and administer security.
Although an operating system often can run from a USB flash drive, media in an optical drive, or an external drive, in most cases, an operating system resides inside a computer or mobile device. For example, it is installed on a hard drive in a laptop or desktop. On mobile devices, the operating system may reside on firmware in the device. Firmware consists of ROM chips or flash memory chips that store permanent instructions.

-http://lifehacker.com/5208533/six-best-portable-operating-systems
Which Portable Operating System is Best?
Puppy Linux 15.71% (741 votes)
Slax 6.61% (312 votes)
Ubuntu 31.58% (1,490 votes)
BackTrack 14.39% (679 votes)
CrunchBang 6.3% (297 votes)
Damn Small Linux 20.9% (986 votes)
Other 4.51% (213 votes)
Operating systems often are written to run on

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