Virtualization
Virtualization is a technique for hiding the physical characteristics of computing resources from the way in which other systems, applications, or end users interact with those resources. This includes making a single physical resource (such as a server, an operating system, an application, or storage device) appear to function as multiple logical resources; or it can include making multiple physical resources (such as storage devices or servers) appear as a single logical resource.
This makes is possible for any x86 machine (PC) to run more than one OS at the time. E.g. you could run a virtual machine with Windows 2003 and a Virtual Machine with Linux RedHat at the same time at the same piece of hardware.
Examples of products that make this possible: - VMware ESX - VMware GSX, VMware Server - VMware Workstation - Microsoft Virtual Server 2005 R2 - XenSource 3.0 - etc.
http://www.vmware.com/ http://www.vmware.com/vmtn/ http://www.microsoft.com/windowsserversystem/virtualserver/default.mspx http://www.trango-systems.com/ http://www.xensource.com/ http://chitchat.at.infoseek.co.jp/vmware/ http://sanbarrow.com/ http://petruska.stardock.net/software/VMware/
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