Virtualization lets multiple operating systems run on the same machine, a technology that can increase server efficiency. Paravirtualization is related, but in comparison offers higher performance and requires that an operating system be explicitly adapted to the virtualized foundation on which it's running.
VMware's virtualization foundation thus far employs full virtualization, while Xen and an upcoming alternative from Microsoft code-named Viridian employ paravirtualization. VMware's preview technology lets paravirtualized operating systems run on VMware's foundation, the company said.
Currently, the software supports only 32-bit versions of Linux, and USB doesn't work.