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Network World - The first variety -- sometimes referred to as native virtualization -- occurs when a hypervisor (also called a microkernel) directly virtualizes all host resources to multiple guest operating systems. That translates instructions that need systems resources on the fly via direct hardware-virtualization/system-instruction translation.
Direct translation presents a discrete virtual-machine appearance to each guest operating system and the applications riding on top of it.
Guest operating systems in this scheme don't need to be modified or be aware of the virtualized representation state of the hardware platform, because their resource needs are managed by the microkernel. VMware's ESX platform is a prime example of a direct hardware-virtualization system.
A variant of native virtualization is a process called client direct-processor emulation, where applications of another operating system are given operating-system resource-emulation capability. This scheme lets applications native to Windows XP work on Apple's Macintosh OS 10.4 using products from Parallels or Microsoft.
This is a scheme typically associated with desktop virtualization.