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‫Now, a user is an entity in a Linux operating system that can manipulate files and perform several

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‫other operations.

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‫Each user is assigned an I.D. that is unique for each user in the operating system.

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‫Single users, single task.

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‫Well, just as the name implies, this operating system is designed to manage the computers so that

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‫one user can effectively do one thing at a time.

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‫The Palm OS, if you remember that for palm hand held computers, it's a great example of a modern single

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‫user's single task operating system.

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‫Single user multitasking.

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‫So this is the type of operating system most people use on their desktops and laptop computers today.

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‫Microsoft Windows and Apple's Mac OS platforms are both examples of operating systems that will let

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‫a single user have several programs in operation at the same time.

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‫Kind of take that for granted these days.

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‫But I'll give you an example, it's entirely possible for a Windows user to be writing a note in a word

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‫processor while downloading a file from the internet while printing the text of an email message.

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‫Multi-user multitask operating systems allows many different users to take advantage of the computer's

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‫resources simultaneously.

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‫So it means the operating system must make sure that the requirements of the various users are balanced

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‫and that each of the programs they are using has sufficient and separate resources so that a problem

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‫with one user won't affect the entire community of users.

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‫Unix VMS and mainframe operating systems such as MVS, these are some examples of multi-user operating

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‫systems.

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‫Our toes, our toss or real time operating systems.

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‫While these are used to control machinery, scientific instruments as well as industrial systems.

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‫An autopsy typically has very little user interface capability and certainly no end user utilities,

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‫since the system will be pretty much a sealed box when it's delivered for use.

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‫A very important part of an art to us system is is managing the resources of the computer so that a

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‫particular operation executes in precisely the same amount of time every time it occurs.