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What do the terminologies related to AMD graphics and Ubuntu mean? [closed]

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http://askubuntu.com – I have an AMD Radeon HD 4850 graphics card, with the latest AMD Catalyst drivers installed.I would like to better understand how things work. What do the terminologies related to AMD graphics cards and Ubuntu mean? What do x.org, FGLRX and RandR mean? Related to the Catalyst driver, why in the info section of the control centre it says Catalyst version is 12.6, but Catalyst control centre is 2.14? What is the difference between Catalyst and Catalyst control centre? Also, why is the Driver packaging version 8.98 while the Driver package says 12.6? As well as in the installer, what is the diff (HowTos)