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Virtual server hardware is used to facilitate in the creation of virtual machines. Virtual machines execute programs like physical machines.
Appeal Virtual Machines was created in 1998.
HP Integrity Virtual Machines was created in 2005.
The main advantage is that,the virtual machines reduces the hardware usage.
In virtual machines we can load different OS.
VM servers are virtual servers. They are used to allow remote access to virtual machines. They can run virtual machines created by other VM products.