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Most applications running on a server can easily share a machine with others, if they could be isolated and secured. Further, in most situations, different operating systems are not required on the same server, merely multiple instances of a single ''operating system''. OS-level virtualization systems have been designed to provide the required isolation and security to run multiple applications or copies of the same OS (but different distributions of the OS) on the same server. [http://openvz.org/ OpenVZ], [http://www.swsoft.com/products/virtuozzo Virtuozzo], [http://linux-vserver.org/ Linux-VServer] and [http://www.sun.com/bigadmin/content/zones/ Solaris Zones] are examples of OS-level virtualization.