The CPU can access both the system space memory and the I/O space memory, whereas the controllers themselves can only access system memory indirectly and then only with the help of the CPU.
Because the source code of Linux is open and freely available, anyone can distribute Linux or write another operating system which can run Linux application programs.
And I say to my girls,"Girls, finish your homework because people in China and India are starving for your jobs and in a flat world they can have them.".
The point is: the value of the theory of the scientist and the value of the ideas of those who are alienated can only be evaluated based upon philosophical reasonableness, moral helpfulness, and immediate luminosity.
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