Oracle VM VirtualBox 4.0 is Oracle's 4th release of the open source freely available virtual machine solution. VirtualBox is targeted at desktop systems where additional virtual machines are needed for such things as software development, testing, reviewing, or simply trying other operating systems. This book covers VirtualBox running on the Apple operating system 10.6 "Snow Leopard." The guest operating system is CentOS 5.5; however, the guest installed is covered thoroughly so that any guest operating system is easily installed. VirtualBox supports most operating systems that will run on x86 hardware; however, the project provides direct support for most versions of Windows, several versions of Linux and BSD, and the Solaris operating system.