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Linux is not an exact copy of any previous operating system. It is modeled after various Unix and Unix-like systems.
You can't. That is illegal and could get you caught cheating. There is no way to legally purchase a copy on the internet.
PowerPoint is presentation software produced by Microsoft. There are versions for both the Windows operating system and Apple's Mac OS X. Providing you have purchased a Copy legally it is not illegal to have PowerPoint on your computer.
you have to restart your whole operating system and then it will revert to the old operating system. you have to restart your whole operating system and then it will revert to the old operating system.
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The same as you do on a desktop, running the same operating system and application.
Windows XP is an Operating System created by the Microsoft company. While there are online sources that Windows XP can be downloaded for free, chances are it is illegal so the best choice may be to purchase a copy. If someone wanted to take the risk and download an illegal copy then torrent sites are places the people download "free" programs.
System Restore Point
System Restore Point
to TFTP
Operating system is the interface between user and computer. GUI( graphical user interface) so user can access and use the application easily they not need to worry about the background process for Example- If you want to copy a file just click copy by your mouse or ctrl+c and you ready to copy. No need to understand that how system doing all these thing. So in short , operating system is a application which makes computer interface easy to use for user.