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Virtual machines are not a full, physical computer. Instead, special software (referred to as a hypervisor) is run on a physical computer that allows the physical computer to be sliced up to run multiple, virtual computers. The physical computer is computers running hypervisor software are referred to as a Virtual HostHosts. To the operating system running on the virtual computer, it looks like a normal computer. However, the resources of the physical computer are being shared among all of the virtual computers running on it. Some examples of hypervisors are VMware ESX, KVM (Linux's Kernel Virtual Machine), Xen, and VirtualBox. VCL supports VMware ESX both through vCenter and in a standalone, free license mode and KVM. Previous versions of VCL also supported VirtualBox.