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This article about running multiple virtual Linux boxes on a single machine discusses three products: VMware, SWsoft and Ensim.
"The concept of virtual machines -- sometimes called virtualization, virtual environments or virtual servers -- isn't particularly new, with IBM's VM operating system debuting 20-plus years ago. (The term "virtual machine" is also used to describe a VMware product that allows Linux and Windows to run side by side on a single machine.) But it's gaining popularity as companies seek to rein in hardware and management costs, and in some cases, reduce rent paid for the space to house huge server farms."
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