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iPXE is provided as a standalone software product; you can download and use it as a PXE ROM or you can deploy it on your network using chainloading. iPXE has also been integrated into many larger products, some of which are listed here. 1)
The Xen hypervisor offers a powerful, efficient, and secure feature set for virtualisation of x86, x86_64, IA64, ARM, and other CPU architectures, and forms the basis of products such as Citrix XenServer.
Xen uses iPXE to enable network booting of virtual machines running within the Xen hypervisor.