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HP's Slate 7 runs the 4.1 build of Android Jelly Bean rather than the slightly newer 4.2 version found on a number of well-specced smartphones from manufacturers such as Samsung.
Unlike other vendors, the OS is stock Android meaning HP decided to avoid the manufacturer customisations found elsewhere. While it means there are no HP-specific features that we know of, standard builds of Android tend to receive software updates sooner than manufacturer or operator-customised versions.
It does, however, come with HP's ePrint application.