Parallels and Fusion support advanced 3D graphics in a Windows virtual machine, whereas VirtualBox does not.

FORBES: Magazine Article

It supports only one virtual machine at a time, while VMware's Fusion and Parallels support more (Fusion can run 20 virtual machines concurrently).

FORBES: Magazine Article

Meanwhile, a firm like Microsoft, which grew up in the computer industry, can use the same fusion of technology to enter the consumer-electronics market with a PC which looks like a games machine.

ECONOMIST: The gamers come out to play | The

Big has gotten harder: Fusion power is infinitely more complicated than internal combustion, and a laptop computer inhabits a different universe from an adding machine.

FORBES: Why Can't We Do Big Things Anymore?