Os is not a software., Blackberry (os) is used in mobile phones., the meaning of (Esc) key is escape key., Blue ray is a opticle meadia device., shift and delete key is a shortcut to permanent delete., Fedora is a operating system product by linux, jarva is a computer language, Malware can harm the computer., Html is a computer language, The first computer in the world is bigger than a room., powerpoint is a word prossesing software.,

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