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Ati HotKey Poller - This service is installed if you update to the latest ATI video card drivers. It provides the ability to hot key your display settings for what ever reason you would need this feature. I do not change them often, so there is no point in having this service "always running."
ATI Smart - This service is installed if you update to the latest ATI video card drivers. It provides the ability to test your particular configuration for compatibility issues and stability issues. The location is also in the ATI display properties control panel. After testing "once," I have found no reason to continue to have this service in memory.