http://www.wikihow.com/Install-VirtualBox http://www.wikihow.com/Install-Windows-XP-on-Ubuntu-with-VirtualBox http://www.wikihow.com/Install-Ubuntu-on-VirtualBox http://www.wikihow.com/Install-and-Setup-Virtualbox%2C-With-an-Ubuntu-Linux-O/S-for-Windows-7 http://www.wikihow.com/Deploy-a-Virtualbox-Virtual-Machine-Server-in-Centos-5 http://www.wikihow.com/Virtualise-Windows-on-OS-X-Using-VirtualBox I think both VMware Workstation and VirtualBox category should be in Virtual Machine category or there is any requirement for parent category?
http://www.wikihow.com/Category:VirtualBox - Done =)
