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Xen is a virtual machine monitor which supports running multiple guests
operating systems on a single machine. Guest OSes (also called "domains")
require a modified kernel which supports Xen hypercalls in replacement to access
to the physical hardware. At boot, the xen kernel is loaded along with the guest
kernel for the first domain (called domain0). domain0 has privileges to access
the physical hardware (PCI and ISA devices), administrate other domains and
provide virtual devices (disks and network) to other domains.

This package contains the Xen4 kernel itself.