对于一般的从业人员来讲，他们的第一反应会是在一个宿主机上运行一个或多个虚拟(客户)操作系统。
The first concept that comes to the mind of the average industry professional is running one or more guest operating systems on a host.
由于执行的速度与宿主机器相当，所以类似这样的程序可以降低模拟的成本。
Programs like this reduce the cost of emulation by generally performing at speeds comparable to the host machine.
大部分读者已熟悉VNC的基本运行情况：将VNC服务器安装在一台中心机器上，然后远程的VNC客户端就可以在宿主机上远程查看中心机器上的图形显示。
Most readers are familiar with VNC's basic operation: put a VNC server on a central machine, then VNC clients hosted remotely can view the central machine's graphical display.
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