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you would know when the system starts to slow down
they also damage data files
use up all the available memory

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is a computer software which is used to prevent detects and remove malicious software,the anti virus was originally made to detect and remove viruses.

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Someone may use this against viruses, worms Trojan horses and any other thing that can make your computer sick. Virus- corrupting the system and it file so it is unusable. Worm is a piece of malware that spreads it self through other workstations through networks. Trojan horse is where apiece of malware is used to manipulate

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Benefits and draw backs of each OS
Windows
Ease of use
Users familiar with older versions of windows will most likely find the up-to-date ones to be easy to work with
Available software
Due to Microsoft dominance of the world market for PC computing operating systems and office software. If you're looking for an application to suit your business needs, chances are that if it exists there will be a Windows version of it available somewhere.
Backwards compatibility
If your using an older version, then there’s a high chance of when you update to the next windows old programs you used will be brought back.
Games
If you want the latest in PC gaming technology, then the best OS for it is windows. Windows has the biggest possible game library of all the OS systems. Some of the most popular games are also available for Linux, and even more for the Mac, but there's really no comparison.
Disadvantages
High Resource Requirements
Microsoft requires its customers to invest the most in their computer hardware: a faster processor, more internal memory and a larger hard disk.
Poor Security
Compared to other operating systems, Microsoft security is weak. According to their own developers, their products "just aren't engineered for security." The result is that Windows computers are more likely than other systems to be hijacked.

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To use Lion, make sure your computer has the following:

·         An Intel Core 2 Duo, Core i3, Core i5, Core i7, or Xeon processor.

·         Mac OS X v10.6.6 or later to install via the Mac App Store (v10.6.8 recommended)

·         7 GB of available disk space.

·         2 GB of RAM.

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Describe the interface/shell of each OS- Windows

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Describe the interface/shell of each OS- Windows

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The Windows user interface provides users with access to a variety of objects necessary for running applications and managing the operating system. The most numerous and familiar of these objects are the folders and files that reside on computer disk drives. There are also a number of virtual objects that allow the user to perform tasks such as sending files to remote printers or accessing the Recycle Bin. The Shell organizes these objects into a hierarchical namespace and provides users and applications with a consistent and efficient way to access and manage objects.

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Here's what Microsoft says you need to run Windows 10:

Processor: 1 gigahertz (GHz) or faster.

RAM: 1 gigabyte (GB) (32-bit) or 2 GB (64-bit)

Free hard disk space: 16 GB.

Graphics card: Microsoft DirectX 9 graphics device with WDDM driver.

A Microsoft account and Internet access.

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Is command line and or GUI offered by each operating system? - Windows

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Is command line and or GUI offered by each operating system? - Windows

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The GUI is easier to use as it is more visually understandable as it uses an interface that is widely recognized. It is widely recognized as many offices, schools and businesses uses windows Operating system and if you do not all ready have an understanding of how the OS works there is often training for the individual. This is for any form of Microsoft Windows apart from MS-DOS, an example of this is:
Windows  MS-DOS is the command line that is not so friendly to use as it requires some knowledge of how to use it.  This Command line can only be used through commands that is known to it, making less people to use it as it is complicated to beginners. (meaning no mouse to navigate) No one really uses MS-DOS, the command shell is more commonly used (known as the Windows command line).The image above is what the Command line looks like when running on a windows Tab.
MAC OS
This is what the MAC OS Command line looks like once it is opened up:The MAC OS GUI is a lot like Windows, in the sense that it is easy to use and has simple guides in-regards to how to use the OS. This isn't as common as windows as this OS is only allowed on apple products, however it is still easy to use and understand. and example of how it looks is in the image bellow:Both are closed source operating systems so the user has the licence to use it (once bought) but not the right to go in and edit the programm

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Pointer: A symbol that appears on the display screen and that you move to select objects and commands. Usually, the pointer appears as a small angled arrow. Text -processing applications, however, use an I-beam pointer that is shaped like a capital I.

Pointing device: A device, such as a mouse or trackball, that enables you to select objects on the display screen.

Icons: Small pictures that represent commands, files, or windows. By moving the pointer to the icon and pressing a mouse button, you can execute a command or convert the icon into a window. You can also move the icons around the display screen as if they were real objects on your desk

Desktop: The area on the display screen where icons are grouped is often referred to as the desktop because the icons are intended to represent real objects on a real desktop.

Windows: You can divide the screen into different areas. In each window, you can run a different program or display a different file. You can move windows around the display screen, and change their shape and size at will.

Menus: Most graphical user interfaces let you execute commands by selecting a choice from a menu.