VirtualBox Download and use!
VirtualBox can be used to try to test other operating systems directly from your computer, VirtualBox is a computer inside your computer.
This is the easiest way how to test new operating systems.
Latest VirtualBox download and install it from here
Download the complete ISO image of the operating system what you want to test.
You have clicked the mouse inside the Virtual Machine display or pressed the host key. This will cause the Virtual Machine to capture the host mouse pointer (only if the mouse pointer integration is not now supported by the guest OS) and the keyboard, which will make them unavailable to other applications running on your host machine.
You can press the host key at any time to recapture the keyboard and mouse (if it is captured) and return them to normal operation. The now assigned host key is shown on the status bar at the bottom of the Virtual Machine window, next to the icon. This icon, together with the mouse icon placed nearby, show the current keyboard and mouse capture state. The VirtualBox host key is now defined as Right Ctrl.