Computer Basic Information
The essential difference between an operating system like Linux and one like Windows is that

Linux is proprietary, whereas Windows is not.
there are multiple versions of Linux, but only one version of Windows.
Windows can run with an Intel processor, whereas Linux cannot.
any programmer can modify Linux code, which is not permitted with Windows.
None of these

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Computer Basic Information
An essential difference between the operating system that runs a typical desktop computer and the operating system that runs a typical PDA is that .......

the desktop OS can run several programs simultaneously whereas the PDA OS cannot.
the desktop OS has a graphical user interface whereas the PDA OS does not.
the desktop OS manages hardware resources whereas the PDA OS does not.
the desktop computer has an OS whereas a PDA does not.
None of these

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