kernel: Namespaces support

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http://unix.stackexchange.com – I am wondering what exactly the Namespaces support in linux kernel means. If I decide to disable it, will I notice any change on my system? And in case somebody decides to make use of Namespaces, is it enough to just compile NAMESPACES=Y in the kernel, or does he need userspace tools as well? NOTE: I am using the newest stable kernel 3.11.1 (HowTos)